MAZDA 1993 Engine Performance User Guide

MAZDA 1993 Engine Performance User Guide

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MAZDA 1993 Engine Performance

MAZDA-1993-Engine-Performance-PRODUCT

ARTICLE BEGINNING

1993 ENGINE PERFORMANCE

  • Mazda Removal, Overhaul & Installation B2200, B2600i, Miata, MPV, MX-3, MX-6, Navajo, Protege, RX7, 323, 626 & 929

ZAVEDENÍ

  • Removal, overhaul, and installation procedures are covered in this article. If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be furnished.
  • POZNÁMKA: On Miata, obtain the code number and deactivate the anti-theft alarm before disconnecting the battery cable.

SYSTÉM ZAPALOVÁNÍ

DISTRIBUTOR

  • POZNÁMKA: Miata, Navajo, and RX7 are equipped with a distributorless ignition system.
  • Refer to the appropriate illustration when removing, overhauling, or installing the distributor. See Figs. 1-7.
  • Obr. 1: Explodoval View Of Distributor (B2200 Carbureted), courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-1
  • Obr. 2: Explodoval View Of Distributor (B2200 PFI, B2600i, MPV 2. 6L, Protege & 323) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-2
  • Obr. 3: Explodoval View Of Distributor (MPV 3.0L), courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-3
  • Obr. 4: Explodoval View Of Distributor (MX-3 1.6L) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-4
  • Obr. 5: Explodoval View Of Distributor (MX-3 1.8L, MX-6 2.5L & 626 2.5L) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-5
  • Obr. 6: Explodoval View Of Distributor (MX-6 2.0L & 626 2.0L) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-6
  • Obr. 7: Explodoval View Of Distributor (929). Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-7

CRANK ANGLE SENSOR

Removal & Installation (Miata)

  • Disconnect the sensor connector. Remove the hold-down bolt. Remove sensor. To install, reverse the removal procedure. Adjust ignition timing.
  • See D – ADJUSTMENTS article. Tighten bolt to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.
  • Removal & Installation (MX-3 1.8L, MX-6 2.5L & 626 2.5L) Crank angle sensor is located on the front of the engine near the crank pulley.
  • To remove, disconnect the negative battery cable. Remove the idle pulley bracket. Remove dipstick pipe. Disconnect the sensor connector.
  • Remove sensor. To install, reverse the removal procedure. Tighten bolts to specification. See the TORQUE SPECIFICATIONS table. Adjust ignition timing. See D – ADJUSTMENTS article.

Removal & Installation (RX7)

  • Disconnect the negative battery cable. Remove the drive belt. Remove crankshaft pulley and crank angle sensor plate. Remove nuts and sensor bracket. Disconnect electrical connectors. Remove crank angle sensors.
  • To install, reverse the removal procedure. Tighten sensor mounting nuts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal & Installation (929)

  • The crank angle sensor is located on the front of the engine, near the crank pulley. To remove, disconnect the sensor connector. Remove mounting bolt.
  • Remove sensor. To install, reverse the removal procedure. Adjust ignition timing. See D – ADJUSTMENTS article. Tighten bolt to specification.
  • See the TORQUE SPECIFICATIONS TABLE at the end of this article.

SNÍMAČ POLOHY KLIKOVÉHO HŘÍDELE

Removal & Installation (Navajo)

  • Disconnect the negative battery cable. Disconnect the crankshaft position sensor connector. See Fig. 8. Remove crankshaft timing sensor mounting screws, and remove sensor.
  • To install, reverse the removal procedure. Tighten screws to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.MAZDA-1993-Engine-Performance-FIG-8
  • Obr. 8: Locating Crankshaft Position Sensor (Navajo). Courtesy of Ford Motor Co.

PALIVOVÝ SYSTÉM

  • VAROVÁNÍ: Always relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact the engine or electrical components.

FUEL SYSTEM PRESSURE RELEASE

Except Navajo

  1. Start the engine. On B2200 PFI, B2600i, Miata, MX-6, RX7, 626, and 929, disconnect the fuel pump relay or circuit opening relay. See the FUEL PUMP/CIRCUIT OPENING RELAY LOCATION table.
  2. On MPV 3.0L, disconnect the airflow sensor connector. On all other models, disconnect the fuel pump connector near the fuel tank (on the MX-3, Protege, and 323, the fuel pump connector is accessible from under the rear seat cushion).
  3. On all models, allow the engine to run until it stalls. Turn the ignition off. Reconnect the electrical connector.

FUEL PUMP/CIRCUIT OPENING RELAY LOCATION TABLE

Application Location

  • B2200 PFI & B2600i ………….. Behind Left Kick Panel
  • Miata …………………….. Left Of Steering Column
  • MX-6 & 626 ………………….. Underhood Relay Panel
  • Protege & 323 …………………….. Below Glove Box
  • RX7 & 929 ……………………. Underhood Fuse Block

Navajo

  • 1) Disconnect the negative battery cable. Remove snow/ice shield.
    • Remove the air intake tube between the air cleaner and the throttle body. Remove the fuel filler cap to release fuel tank pressure.
    • Connect the Fuel Pressure Gauge (49-UN01-010) to the fuel pressure relief valve (Schrader valve) on the fuel supply manifold, near the fuel pressure regulator. See Fig. 25.
  • 2) As an alternate method, disconnect the inertia switch connector behind the instrument panel, under the radio. Start the engine and operate until it stalls.

FUEL LINE CONNECTORS (NAVAJO)

  • POZNÁMKA: Although push-connect fittings and spring lock couplers are similar in function, different procedures and tools are used to disconnect and connect these connectors. See Figs. 9 and 10.

Disconnect (Push-Connect Fitting)

  • Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove locking (safety) clip (if equipped).
  • Position Push-Connect Fitting Releaser (49-UN01-053 for 5/16″ line; 49-UN01-054 for 3/8″ line) over the fuel line. See Fig. 9.
  • Slide the releaser into the fitting. Pull fuel lines apart.

Připojit

  • Press the fuel lines together until a click is heard. Attempt to pull lines apart to ensure the coupler is fully engaged. Install locking clip (if equipped).MAZDA-1993-Engine-Performance-FIG-9
  • Obr. 9: Disconnecting Push-Connect Fitting (Navajo). Courtesy of Ford Motor Co.

Disconnect (Spring Lock Coupler)

  • 1) Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove locking (safety) clip (if equipped). Place Spring Lock Coupler Releaser (49-UN01-051 for 3/8″ line; 49-UN01-052 for 1/2″ line) over fuel line coupler. See Fig. 10.
  • 2) Push spring lock coupler releaser to release the female fitting from the garter spring. Pull the spring lock coupler apart. Remove releaser.

Connect (Spring Lock Coupler)

  1. Check for a damaged garter spring. If the garter spring is damaged, remove it using a small hooked wire and replace it. Wipe the ends of the lines using a clean cloth. Place new “O” rings onto the tube. Lubricate ends of lines with clean refrigerant oil.
  2. Push the fittings together using a slight twisting motion. Ensure the garter spring is over the flared end of the female fitting. Attempt to pull lines apart to ensure the coupler is fully engaged. Install locking clip (if equipped).

Varování: Relieve fuel system pressure before disconnecting the coupling

  1. Spring Lock Coupler
    • Fit Tool To Coupling
    • So That Tool Can Enter
    • Cage To Release Garter SpringMAZDA-1993-Engine-Performance-FIG-10
  2. Push Tool Into Cage
    • Push Tool Into Cage Opening
    • To Release Female Fitting
    • From Garter SpringMAZDA-1993-Engine-Performance-FIG-11
  3. Pull Male and Female
    • Fittings ApartMAZDA-1993-Engine-Performance-FIG-12
  4. Remove Tool From Disconnected
    • Spring Lock CouplingMAZDA-1993-Engine-Performance-FIG-13

Obr. 10: Disconnecting Spring Lock Coupler (Navajo). Courtesy of Ford Motor Co.

FUEL SYSTEM PRIMING

  • POZOR: After performing fuel system repairs, use the following procedure to prime the fuel system before starting the engine.
  • This prevents excessive engine cranking and allows the system to be leak-tested.

Except Navajo

  1. On B2200 PFI, B2600i, and MPV, connect the jumper wire between the terminals of the Yellow 2-pin connector. See the FUEL PUMP TEST CONNECTOR LOCATION table.
  2. On all others, connect the jumper wire between the GND and F/P terminals of the data link connector. See Fig. 11. On all models, turn ignition on for about 10 seconds and then off. Disconnect the jumper wire.

Navajo

  • Without starting the engine, turn the ignition on and off 5-10 times.

FUEL PUMP TEST CONNECTOR LOCATION TABLE

Application Location

  • B2200 PFI & B2600i ……… Right Rear Corner Of Engine Compartment
  • MPV …………………… Left Front Corner Of Engine CompartmentMAZDA-1993-Engine-Performance-FIG-14

Obr. 11: Data Link Connector Terminal ID (Except B2200, B2600i, MPV & Navajo) Courtesy of Mazda Motors Corp.

CARBURETOR B2200

Odstranění a instalace

  • Disconnect the negative battery cable. Remove the air cleaner.
  • Disconnect accelerator cable, cruise control cable (if equipped), all necessary vacuum hoses, fuel hoses, and electrical connectors. Remove carburetor mounting nuts. Remove the carburetor. To install, reverse the removal procedure.

Disassembly (Air Horn & Choke Assembly)

  1. DO NOT remove the choke valve and shaft from the air horn.
    • Disconnect the vacuum hose from the choke opener (pull-off) diaphragm. Remove the accelerator pump connecting rod, spring, and lever. See Fig. 22. Remove spring. Disconnect the air vent solenoid valve wire from the connector.
  2. Disconnect the choke rod. Remove air horn retaining bolts. Remove the air horn and choke assembly from the main body. Remove the air vent solenoid valve, spring, and gasket from the air horn.

Disassembly (Needle Valve & Float)

  • Remove the float, pin, and gasket. See Figs. 15 and 22. Remove the needle valve assembly. Remove the sight glass assembly from the main body.
  • POZOR: Note the location and size of air bleeds and jets before removal. Ensure components are installed in the correct locations.

Disassembly (Air Bleeds & Jets)

  1. Remove secondary slow jet, secondary slow bleed, secondary main bleed, and secondary main jet from the main body. See Figs. 12 and 22.
    • Remove primary main bleed, slow jet and plug, primary slow bleed, and primary main jet from the main body.
  2. Remove richer air bleed, primary slow bleed, coasting richer air bleed, and coasting richer jet from the air horn. See Figs. 13 and 22.MAZDA-1993-Engine-Performance-FIG-15
    1. Secondary Slow Jet
    2. Secondary Slow Bleed
    3. Secondary Main Bleed
    4. Secondary Main Jet
    5. Primary Main Bleed
    6. Slow Jet & Plug
    7. Primary Slow Bleed
    8. Primary Main Jet

Obr. 12: Locating Air Bleeds & Jets (Main Body) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-16

Obr. 13: Locating Air Bleeds & Jets (Air Horn) Courtesy of Mazda Motors Corp.

Disassembly (Main Body)

  1. DO NOT remove venturis from the main body. Remove the coasting richer solenoid valve and “O” ring. See Fig. 22. Remove the idle switch and spring. Remove the slow fuel-cut solenoid valve, needle valve, spring, and gasket. Remove dashpot (M/T).
  2. Remove the accelerator pump plunger and spring assembly. Remove retaining clip, strainer, and inlet check ball. Remove the outlet check ball plug, the outlet check ball, and the spring.
  3. Disconnect the throttle link, vacuum diaphragm, connecting rod, and throttle return spring. Remove throttle body-to-main body retaining bolts (one bolt is located inside the throttle body). Separate the throttle body from the main body.

Disassembly (Throttle Body)

  • DO NOT remove the throttle valve and shaft from the throttle body.
  • Remove the vacuum (secondary) diaphragm assembly. Remove the diaphragm cover screws. Remove cover, spring, and diaphragm. Using a small punch and hammer, remove the spring pin located in front of the mixture adjusting screw.
  • Remove the mixture adjusting screw.
  • POZNÁMKA: DO NOT immerse diaphragms, electrical components, or synthetic parts in carburetor cleaner.

Čištění a kontrola

  1. Thoroughly clean metal parts in carburetor cleaner. Using compressed air, dry all components and blow out all passages. DO NOT use wire or pointed metal objects for cleaning. Inspect the air horn, main body, and throttle body for cracks.
  2. Inspect the choke shaft and throttle shaft for wear. Check all jets and air bleeds for open passages. Inspect the needle and seat for wear. Inspect float and accelerator pump cup for damage. Replace all damaged components.
  3. Inspect the vacuum diaphragm for damage. Inspect the idle mixture screw for wear and burrs. Apply battery voltage to solenoids to ensure solenoids operate (indicated by valve stem movement).
  4. Check the electric choke heater by connecting an ohmmeter to the wire connector and the heater ground. If continuity does not exist, replace electric choke heater.
  5. To check the Mixture Control (M/C) solenoid, apply battery voltage across the solenoid using the solenoid connector. See Fig. 14. From the bottom of air horn, blow air through the valve in the direction indicated. If air does not flow through the valve with the solenoid energized, replace the air horn assembly (M/C solenoid and air horn are replaced as an assembly).

Obr. 14: Checking Mixture Control (M/C) Solenoid Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-17

Reassembly (All Parts)

  1. To reassemble, reverse the disassembly procedure using NEW gaskets. DO NOT install the spring pin in front of the mixture screw until idle mixture has been adjusted with the engine running. Before installing the air horn on the main body, adjust the float level and float drop. Install a new “O” ring on the M/C solenoid and coat the “O” ring with gasoline.
  2. After reassembly and before installing the carburetor, adjust the choke pull-off diaphragm, fast idle cam (throttle opening angle), fast idle cam (choke opening angle), choke unloader, secondary throttle valve, and accelerator cable.
  3. After installing the carburetor, adjust the curb (hot) idle speed, the fast (cold) idle speed, and the idle mixture. See D – ADJUSTMENTS article.

Adjusting Float Level

  • With the air horn upside-down and the gasket removed, allow the float to hang by its weight. Measure the distance between the top of the float and the air horn gasket surface.
  • See Fig. 15. If the distance is not .42-.46″ (10.7-11.7 mm) on A/T models or .46-.50″ (11.7-12.7 mm) on M/T models, bend the float seat as necessary.

Adjusting Float Drop

With the air horn upright and the gasket removed, allow the float to hang by its weight. Measure between the bottom of the float and the air horn gasket surface. See Fig. 16. If the distance is not 1.81-1.85″ (46.0-47.0 mm), bend the float stop as necessary. See Fig. 15.
Obr. 15: Adjusting Float Level. Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-18

Obr. 16: Adjusting Float Drop Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-19

  • Apply about 16 in. Hg vacuum to choke pull-off diaphragm.
  • Lightly push the choke plate toward the closed position. Measure the clearance between the top of the choke plate and the air horn. See Fig. 17. If clearance is not .067-.085″ (1.70-2.16 mm), bend choke lever until clearance is within specification.

Adjusting Fast Idle Cam (Throttle Opening Angle)

  • Set the fast idle cam on second highest position. Measure the distance between the primary throttle valve and the throttle bore. See Fig. 18. If clearance is not .033-.041″ (0.84-1.04 mm), turn fast idle adjusting screw as necessary.MAZDA-1993-Engine-Performance-FIG-20
  • Obr. 17: Adjusting Choke Pull-Off Diaphragm Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-21
  • Obr. 18: Adjusting Fast Idle Cam (Throttle Valve Angle). Courtesy of Mazda Motors Corp.

Adjusting Fast Idle Cam (Choke Valve Angle)

  • Set the fast idle cam on second highest position. Measure the clearance between the top of the choke plate and the air horn. See Fig. 19. If clearance is not .024-.045″ (0.60-1.14 mm), bend the starting arm.
  • If a large adjustment is required, bend the choke rod.

Adjusting Choke Unloader

  • Fully open primary throttle valve. Measure the clearance between the top of the choke plate and the air horn. See Fig. 20. If clearance is not. 110-.143″ (2.80-3.62 mm), bend tab as necessary.MAZDA-1993-Engine-Performance-FIG-22
  • Obr. 19: Adjusting Fast Idle Cam (Choke Opening Angle). Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-23

Obr. 20: Adjusting Choke Unloader Courtesy of Mazda Motors Corp.

Adjusting Secondary Throttle Valve

  • The secondary throttle valve should start to open when the primary throttle valve opens 50-54 degrees and should be fully open when the primary throttle valve is fully open.
  • Measure the clearance between the primary throttle valve and throttle bore when the secondary throttle valve starts to open. See Fig. 21. If clearance is not .289-.325″ (7.35-8.25 mm), bend tab as necessary.

Adjusting Accelerator Cable

  • Check accelerator cable deflection (free play) at the carburetor.
  • If deflection is not .039-.118″ (1.0-3.0 mm), turn cable adjusting nuts as needed. Fully depress the accelerator pedal.
  • If the primary throttle valve does not fully open, turn the accelerator stop bolt (above the accelerator pedal) as needed to obtain full valve opening.MAZDA-1993-Engine-Performance-FIG-24
  • Obr. 21: Adjusting Secondary Throttle Valve Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-25
    1. Accelerator Pump Connecting Rod
    2. Jaro
    3. Air Vent Solenoid Valve
    4. Sytič Rod
    5. Vzduchový klakson
    6. Choke Assembly
    7. Plovák
    8. Sestava jehlového ventilu
    9. Accelerator Pump Plunger
    10. Sestava průzoru
    11. Idle Switch
    12. Slow Fuel-Cut Valve
    13. Coasting Richer Solenoid Valve
    14. Dashpot
    15. Outlet Check Ball & Spring
    16. Inlet Check Ball
    17. Primary Slow Jet
    18. Secondary Slow Jet
    19. Primary Main Jet
    20. Secondary Main Jet
    21. Zástrčka
    22. Primary Venturi & Nozzle
    23. Secondary Venturi & Nozzle
    24. Primary Main Bleed
    25. Secondary Main Bleed
    26. Hlavní tělo
    27. Vacuum Diaphragm Assembly
    28. Spojka plynu
    29. Tělo škrticí klapky
    30. Mixture Adjust Screw
    31. Těsnění
    32. Accelerator Pump Linkage
    33. M/C Solenoid Connector

Obr. 22: Explodoval View Of 2-Barrel Carburetor (B2200) Courtesy of Mazda Motors Corp.

PALIVOVÉ ČERPADLO

  • POZOR: After performing fuel system repairs, prime the fuel system before starting the engine. See FUEL SYSTEM PRIMING.

Removal (B2200 Carbureted With Electric Pump, B2200 PFI & B2600i)

  • Release fuel system pressure (except B2200 Carbureted). See FUEL SYSTEM PRESSURE RELEASE. Remove the fuel tank. Remove the fuel pump and sending unit assembly. Remove the fuel pump from the assembly.

Installation (B2200 Carbureted With Electric Pump, B2200 PFI & B2600i)

  • Install a new pump in the sending unit assembly. Ensure fuel pump wire terminals do not touch hose clamps or bracket assembly. To complete the installation, reverse the removal procedure.

Removal (Miata, Protege, RX7 & 323)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE.
  2. On Miata, remove rear package trim (behind seat). On Protege and 323, remove the rear seat. On RX7, remove carpet in luggage compartment.
  3. On all models, remove the fuel pump access cover. Disconnect fuel hoses and electrical connector. Remove the fuel pump and sending unit assembly. Remove the fuel pump from the assembly.

Installation (Miata, Protege, RX7 & 323)

  1. Install fuel pump to assembly using NEW “O” ring, cap, and spacer between fuel pump and outlet pipe (coat components with oil or gasoline before installing).
    • See Fig. 23. After installing the fuel pump to the assembly, blow through the outlet pipe (at the top of the assembly) toward the pump to confirm sealing of the “O” ring.
  2. If air flows through the pump, shake the pump several times to dislodge the check ball. To complete the installation, reverse the removal procedure.

Obr. 23: Installing Fuel Pump (Miata, Protege, RX7 & 323) Courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-26

Removal (MPV & MX-3)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove rear seat. On MPV, lift the rear floor mat.
  2. On all models, remove the fuel pump cover. Disconnect fuel hoses and electrical connector. Remove the fuel pump and sending unit assembly. Remove the fuel pump from the assembly.

Installation (MPV & MX-3)

  1. Replace fuel hose between pump and outlet pipe (DO NOT apply excessive force when installing onto pump nipple). Install hose clamps.
  2. Install the pump with wire terminals positioned to avoid contact with metal parts. To complete the installation, reverse the removal procedure.

Removal (MX-6 & 626)

Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove fuel tank. Turn the lock ring counterclockwise. Remove lock ring. Remove the fuel pump and sending unit assembly.

Installation (MX-6 & 626)

  • Clean the seal area on the tank and assembly flange. Lightly coat the NEW “O” ring with molybdenum grease. Install the seal in the groove.
  • Carefully install the assembly into the fuel tank, ensuring the filter is not damaged and the seal remains in the groove. Install and turn the lock ring clockwise until tight. Install fuel tank.

Removal & Installation (929)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE.
  2. Remove rear seat mounting bolts, located between the seat bottom and the seat back cushions. Remove seat cushions. Remove the amplifier and CD changer (if equipped) and lift the luggage compartment carpeting.
    • Remove hole cover.
  3. Disconnect fuel hoses and electrical connector. Remove the fuel pump and sending unit assembly. Remove the fuel pump from the assembly.
    • Chcete-li nainstalovat, v opačném případě postup demontáže.

Removal (Navajo)

  • Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove fuel tank. Using the Fuel Tank Lock Ring Wrench (T86T9275-A), turn the lock ring counterclockwise.
  • Remove the lock ring. Remove the fuel pump and sending unit assembly. Remove the fuel pump from the assembly.

Installation (Navajo)

  • Clean the seal area on the tank and assembly flange. Lightly coat the NEW “O” ring with molybdenum grease. Install the seal in the groove. Carefully install the assembly into the fuel tank, ensuring the filter is not damaged and the seal remains in the groove.
  • Install and turn the lock ring clockwise until tight using Fuel Tank Lock Ring Wrench (T86T-9275-A). Install the fuel tank.

FUEL PRESSURE REGULATOR

POZOR: After performing fuel system repairs, prime the fuel system before starting the engine. See FUEL SYSTEM PRIMING.

Removal & Installation (Except Navajo)

  1. Disconnect the negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. On 929, remove the dynamic chamber. On all models, disconnect the vacuum and fuel hose(s) from the regulator. Remove regulator mounting bolts. Remove regulator, gasket, and “O” ring (if equipped).
  2. To install, reverse the removal procedure. Install NEW gasket and “O” ring (if equipped). On 929, install dynamic chamber with a NEW gasket. Tighten bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal & Installation (Navajo)

  1. Disconnect the negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect the vacuum hose from the regulator. Disconnect the fuel line coupling at regulator. See FUEL LINE CONNECTORS (NAVAJO).
  2. Remove regulator mounting screws. Remove regulator, “O” ring, and washer. To install, reverse the removal procedure using a new washer and “O” ring. Lubricate the NEW “O” ring with light oil. DO NOT use silicone grease.

FUEL RAILS & INJECTORS

POZOR: After performing fuel system repairs, prime the fuel system before starting the engine. See FUEL SYSTEM PRIMING.

Removal & Installation (B2200 PFI, B2600i & MPV 2.6L)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM. Remove the throttle body. See THROTTLE BODY under FUEL SYSTEM.
  2. Remove the support brackets and the injector harness bracket from the dynamic chamber. Disconnect vacuum hoses, PCV hose, intake air thermosensor connector, and ground wire from the dynamic chamber. Remove the dynamic chamber.
  3. Disconnect the vacuum hose and fuel hoses from the fuel rail. Disconnect the injector electrical connectors. Pull the fuel rail with injectors and pressure regulator upward to remove. Remove insulators, injectors, and “O” rings from the fuel rail.
  4. To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings, and install rings on injectors. Install NEW insulators. Tighten fuel rail mounting bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.
    • Install dynamic chamber with a new gasket.

Removal & Installation (Miata)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect the negative battery cable. Remove the air valve and PCV valve hose from the intake manifold. Disconnect the vacuum and fuel hoses from the fuel rail. Disconnect the injector electrical connectors. Remove insulators, injectors, and “O” rings from the fuel rail.
  2. To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings and install rings on injectors. Install NEW insulators. Tighten fuel rail mounting bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal & Installation (MPV 3.0L)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove the air intake tube. See Fig. 24. Remove the throttle body. See THROTTLE BODY.
  2. Remove intake air pipe, extension manifolds, and upper intake manifold. Disconnect fuel hoses from fuel rail. Disconnect the injector electrical connectors. Remove the fuel rail and injectors as an assembly.
    • Remove insulators, injectors, and “O” rings from the fuel rail.
  3. To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings, and install rings on injectors. Install NEW insulators. Tighten fuel rail mounting nuts to specification.
    • See the TORQUE SPECIFICATIONS TABLE at the end of this article. Install NEW extension manifold and intake air pipe gaskets.MAZDA-1993-Engine-Performance-FIG-27

Obr. 24: View Of Upper Intake Manifold Components & Fuel Rail (MPV 3.0L) Courtesy of Mazda Motors Corp.

Removal & Installation (MX-3 1.6L, MX-6 & 626 2.0L, Protege & 323)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect the injector electrical connectors.
    • Remove the injector harness from the fuel rail. Remove fuel rail mounting bolts. Remove the fuel rail, injectors, and pressure regulator as an assembly.
  2. Remove insulators, injectors, and “O” rings from the fuel rail.
    • To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings and install rings on injectors. Install NEW insulators.
    • Tighten fuel rail mounting bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal & Installation (MX-3 1.8L, MX-6 & 626 2.5L)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect the negative battery cable. Remove the air intake tube.
    • Disconnect the vacuum and fuel hoses from the fuel rail. Disconnect the injector electrical connectors. Remove the fuel rail, injectors, and pressure regulator as an assembly. Remove insulators, injectors, and “O” rings from the fuel rail.
  2. To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings and install rings on injectors. Install NEW insulators. Tighten fuel rail mounting bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal (Navajo)

  1. Thoroughly clean the engine. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect the negative battery cable.
    • Remove the upper intake manifold and throttle body as an assembly.
  2. Disconnect the fuel supply line from the fuel supply manifold. See FUEL LINE CONNECTORS (NAVAJO). Disconnect the fuel return line from the fuel pressure regulator. Remove fuel supply manifold. See Fig. 25.
    • Disconnect the injector electrical connectors and retaining clips. Remove injectors from the fuel supply manifold.

Installation (Navajo)

  1. Lubricate NEW injector “O” rings with light oil. DO NOT use silicone grease. Carefully install injectors into the fuel supply manifold. Carefully install the fuel supply manifold into the lower manifold using a new manifold gasket.
  2. Clean and oil the fuel supply manifold bolt threads. Install fuel supply manifold bolts. Tighten bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article. To complete the installation, reverse the removal procedure.MAZDA-1993-Engine-Performance-FIG-28

Obr. 25: Explodoval View of Fuel Supply Manifold Assembly (Navajo), courtesy of Ford Motor Co.

Removal & Installation (RX7)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove the air intake duct. See Fig. 26. Remove the throttle body. See THROTTLE BODY.
  2. Remove the upper intake manifold. Disconnect fuel hoses from fuel rail. Disconnect the injector electrical connectors. Remove the idle speed control solenoid. Remove the fuel rail and injectors as an assembly.
    • Remove insulators, injectors, and “O” rings from the fuel rail.
  3. To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings, and install rings on injectors. Install NEW insulators. Tighten fuel rail mounting nuts to specification.
    • See the TORQUE SPECIFICATIONS TABLE at the end of this article. Install NEW manifold gaskets.MAZDA-1993-Engine-Performance-FIG-29
      1. Potrubí čerstvého vzduchu
      2. Lanko plynu
      3. Sací potrubí
      4. Čistič vzduchu
      5. Air By-Pass Valve
      6. Tlaková komora
      7. Hadice pro přívod vzduchu
      8. Hadice chladicí kapaliny
      9. Konektor
      10. Vakuová hadice
      11. Tělo škrticí klapky
      12. Upper Intake Manifold
      13. Palivová hadice
      14. Konektor
      15. Vakuová hadice
      16. Mezichladič

Obr. 26: Explodoval View of Air Intake System, courtesy of Mazda Motors Corp.

Removal & Installation (929)

  1. Disconnect the negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Remove the dynamic chamber and throttle body as an assembly.
    • Disconnect the injector electrical connectors. Disconnect the vacuum and fuel hoses. Remove the fuel rail, injectors, and pressure regulator as an assembly.
  2. Remove insulators, injectors, and “O” rings from the fuel rail.
    • To install, reverse the removal procedure. Apply a coat of engine oil to NEW “O” rings, and install rings on injectors. Install NEW insulators.
    • Tighten fuel rail mounting bolts to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

KYSLÍKOVÝ SENZOR

Odstranění

Disconnect the oxygen sensor electrical connector. The sensor may be difficult to remove when the engine temperature is less than 120øF (48øC).
If the sensor is difficult to remove, use rust penetrant to avoid damaging the threads. Carefully remove the sensor.

Instalace

Apply anti-seize to sensor threads (if reusing old sensor or if new sensor is not coated with anti-seize). Install the sensor and tighten to specification. See the TORQUE SPECIFICATIONS TABLE at the end of this article. Reconnect the sensor electrical connector.

TĚLESO PLYNU

POZOR: After performing fuel system repairs, prime the fuel system before starting the engine. See FUEL SYSTEM PRIMING.

Removal & Installation (Except Navajo)

  1. On MPV 3.0L, drain about 2 qts. (1.9 L) of coolant from the cooling system. On all models, disconnect the negative battery cable.
    • Remove air intake tubes.
  2. Disconnect accelerator cable, coolant hoses, and electrical connectors from throttle body as necessary. On 929, remove by-pass air control valve. On all models, remove the throttle body.
    • To install, reverse the removal procedure using the new throttle body gasket. See the TORQUE SPECIFICATIONS TABLE at the end of this article.

Removal (Navajo)

  1. Disconnect the throttle position sensor electrical connector.
    • Remove snow/ice shield to expose throttle linkage. Remove throttle cable bracket.
  2. Disconnect the cable from the ball stud on the throttle body. Remove the air cleaner-to-throttle body air inlet tube. Disconnect the canister purge hose from the fitting beneath the throttle body.
  3. Remove 4 throttle body bolts. Remove the throttle body from the upper intake manifold.

Installation (Navajo)

Install a new throttle body gasket. To complete the installation, reverse the removal procedure.

TURBOCHARGER

Removal (RX7)

  1. Raise and support the vehicle. Drain coolant. Disconnect the negative battery cable. Remove the air cleaner, intake air hoses, and pressure chamber. See Fig. 26. Remove air control valve assembly.
    • Disconnect vacuum hoses.
  2. Remove the drive belt and the air injection pump. Disconnect the oxygen sensor, exhaust downpipe, and catalytic converter. Disconnect the turbo control valve rod and actuator. See Fig. 27. Disconnect oil pipes from turbocharger. Remove coolant hoses.
  3. Remove bolts securing the turbocharger to the exhaust manifold. Remove the turbocharger assembly.

Installation (RX7)

  • Install turbocharger with NEW gaskets, “O” rings, and exhaust manifold studs. Tighten nuts and bolts to specification. See Fig. 28.
  • See the TORQUE SPECIFICATIONS TABLE at the end of this article. To complete the installation, reverse the removal procedure. Prime oil system.MAZDA-1993-Engine-Performance-FIG-30
    1. Intake Air Pipe
    2. Air Control Valves
    3. Vakuové hadice
    4. Intake Air Pipe
    5. Turbo Control Actuator
    6. Klip
    7. Sestava turbodmychadla

Obr. 27: Explodoval View Of Turbocharger Assembly, courtesy of Mazda Motors Corp.MAZDA-1993-Engine-Performance-FIG-31

  • “A: Tighten To 28-38 Ft. Lbs (38-51 N.m)
  • “B: Tighten To 16-21 Ft. Lbs (22-29 N.m)
  • “C: Tighten To 32-42 Ft. Lbs (44-57 N.m)

Obr. 28: Installing the Turbocharger. Courtesy of Mazda Motors Corp.

SPECIFIKACE MOMENTU

TORQUE SPECIFICATIONS TABLE

Component Ft. Lbs (N.m)

  • Crank Angle Sensor Mounting Bolt (Miata) …… 14-20 (19-27)
  • Distributor Mounting Bolts ……………….. 14-18 (19-25)
  • Fuel Rail Mounting Bolt/Nut ………………. 14-18 (19-25)
  • Idle Pulley Bracket Bolts (MX-3 1.8L) ……… 14-19 (19-26)

Senzor kyslíku

  • B2200 Carbureted ………………………………… (1)
  • Navajo ……………………………………… 30 (41)
  • All Others …………………………….. 22-36 (30-49)

Throttle Body-To-Manifold Bolts

  • (Except Navajo) ………………………… 14-18 (19-25)

Turbo-To-Exhaust Manifold Bolts/Nuts (RX7)

  • "A" Bolts (2) ………………………….. 28-38 (38-51)
  • "B" Nuts (2) …………………………… 16-21 (22-29)
  • "C" Nuts (2) …………………………… 32-42 (44-57)
  • Turbo-To-Exhaust Pipe Nut (RX7) …………… 28-38 (38-52)

Upper Intake Manifold Bolt/Nut

  • Except Navajo ………………………….. 14-18 (19-25)
  • Navajo ………………………………… 15-18 (20-24)

INCH Lbs. (N.m)

  • Carburetor Mounting Nuts (B2200) …………… 62-97 (7-11)
  • Crank Angle Sensor Mounting Bolt
  • MX-3 1.8L, MX-6 2.5L & 626 2.5L ……………… 95 (10.7)
  • RX7 & 929 ………………………………. 71-97 (8-11)
  • Crankshaft Position Sensor Bolts (Navajo) ….. 79-106 (9-12)
  • Dipstick Pipe Bolts (MX-3 1.8L) ……………. 71-97 (8-11)
  • Fuel Pressure Regulator Bolts ……………… 71-97 (8-11)
  • Fuel Supply Manifold Bolts (Navajo) ………. 89-124 (10-14)
  • Throttle Body-To-Manifold Bolts (Navajo) …… 71-106 (8-12)
  • Turbo Oil Return Pipe Nut (RX7) ……………. 71-97 (8-11)
    1. Information is not available from the manufacturer.
    2. See Fig. 28 for nut/bolt identification.

END OF ARTICLE

VÍCE INFORMACÍ

  • N – REMOVE/INSTALL/OVERHAUL
  • Article Text (p. 24)
  • 1993 Mazda 929
  • For Techdoc Ltd.
  • Copyright © 1997 Mitchell International
  • Thursday, March 25, 1999 12:06 AM

Dokumenty / zdroje

PDF thumbnail1993 Engine Performance
User Guide · B2200, B2600i, MX-3, MX-6, RX7, 323, 626, 929, 1993 Engine Performance, 1993, Engine Performance, Performance
PDF thumbnail1993 Engine Performance
User Guide · 929, 1993 Engine Performance, 1993, Engine Performance, Performance

Reference

Zveřejněno: 19. května 2026
Updated: May 20, 2026

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