Pontiac Fiero 1984-1988 Repair Guide

Engine

Print

REMOVAL & INSTALLATION



4-2.5L Engine


Click image to see an enlarged view

Fig. Fig. 1 Exploded views of the engine mounts used on the older model 2.5L engines with manual and automatic transaxles



Click image to see an enlarged view

Fig. Fig. 2 Components of the engine mount-to-crossmember used on four-cylinder engines



Click image to see an enlarged view

Fig. Fig. 3 Exploded views of the rear transaxle mount used on older model 2.5L engines



Click image to see an enlarged view

Fig. Fig. 4 Different views of some of the steps needed for engine removal and installation



Click image to see an enlarged view

Fig. Fig. 5 Engine mount locations-2.5L engine



Click image to see an enlarged view

Fig. Fig. 6 Location of the engine support bracket and its retainers-2.5L engine



Click image to see an enlarged view

Fig. Fig. 7 Exploded view of the automatic transaxle mounting bracket and components-2.5L engine



Click image to see an enlarged view

Fig. Fig. 8 Engine torque strut and related components-2.5L engine

The engine assembly is removed from underneath the vehicle.

  1. Disconnect the negative (-) battery cable.
  2.  
  3. With the cool, drain the engine coolant into a suitable drain pan.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the rear engine compartment lid and also the side cover panels with an assistant.
  2.  

Do not remove the torsion rod retaining bolts. Scribe the hinges for later assembly. Remove the trim at the sail panel below the battery side panel.

  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the throttle and shift cables.
  4.  
  5. Position suitable drain pan under the engine and disconnect the heater hose at the intake manifold.
  6.  
  7. Disconnect the vacuum hoses from all non-engine components.
  8.  
  9. Disconnect the fuel lines and filter.
  10.  


CAUTION
To reduce the risk of fire and personal injury, it is necessary to relieve the fuel system pressure before servicing any fuel system component. If this procedure is not performed, fuel may be sprayed out of the connection under pressure. Always keep a dry chemical (Class B) fire extinguisher near the work area.

To relieve fuel system pressure:

    1. Remove the fuel pump fuse from the fuse block located in the passenger compartment.
    2.  
    3. Start the engine and run until the engine stops due to the lack of fuel.
    4.  
    5. Crank the engine for 3 seconds to ensure all pressure is relieved.
    6.  


  1. Disconnect the fuel pump relay and oxygen sensor.
  2.  
  3. On models with automatic transaxle, disconnect the transaxle cooler lines.
  4.  
  5. Disconnect the slave cylinder from manual transaxle equipped vehicles.
  6.  
  7. Disconnect the engine-to-chassis ground strap and electrical harness connector at bulkhead.
  8.  
  9. Disconnect the air conditioning system, if so equipped, then disconnect the air conditioning lines at the compressor and seal the ends.
  10.  


CAUTION
Please refer to before discharging the compressor or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.

  1. Remove the rear console.
  2.  
  3. Remove the ECM harness through the bulkhead panel.
  4.  
  5. Install an engine support fixture part No. J28467 or equivalent.
  6.  
  7. Remove the engine strut bracket and mark the bolt and bracket for reassembly.
  8.  
  9. Raise the vehicle and support with jackstands. Refer to the Engine removal illustration.
  10.  
  11. Remove the rear wheels.
  12.  
  13. On models equipped with an automatic transaxle, remove the torque converter bolts.
  14.  
  15. Remove the parking brake cable and calipers. Wire the calipers to the body so not to damage the brake hose.
  16.  

Do not disconnect the brake hoses. Support the caliper out of the way with a piece of wire.

  1. Remove the strut bolts and mark the struts for realignment. Refer to the MacPherson Strut removal and installation procedure in .
  2.  
  3. Disconnect the air conditioning wiring, if so equipped.
  4.  
  5. Loosen the four engine cradle bolts.
  6.  
  7. On the 4-cylinder engine, release the parking brake cables at the cradle. A special tool No. J-34065 is available for this procedure.
  8.  


CAUTION
Support the engine/transaxle and cradle assembly on a jack. Be sure to support the outboard ends of the lower control arms. Disconnect the engine support fixture.

  1. Lower the car and attach the engine/transaxle assembly to a dolly. Remove the cradle bolts. Raise the car and roll the dolly from under the car.
  2.  
  3. Separate the engine and transaxle.
  4.  

To install:

  1. Reconnect the engine and transaxle on the cradle.
  2.  
  3. Lower the vehicle over the dolly.
  4.  
  5. Install the cradle bolts in sequence as below.
  6.  
    1. Install the front bolts finger-tight.
    2.  
    3. Torque the rear bolts to 76 ft. lbs. (103 Nm).
    4.  
    5. Torque the front bolts to 66 ft. lbs. (90 Nm).
    6.  

  7. Raise the vehicle and support with jackstands. Install the MacPherson strut bolts.
  8.  
  9. Install the brake caliper and parking brake cable.
  10.  
  11. Connect the air conditioning wiring, if so equipped.
  12.  
  13. Install the torque converter bolts and tighten (automatic transaxle).
  14.  
  15. Install the rear wheels and torque the lug nuts to 100 ft. lbs. (134 Nm).
  16.  
  17. Lower the vehicle.
  18.  
  19. Install the engine strut bracket.
  20.  
  21. Connect the radiator and heater hoses and tighten clamps.
  22.  
  23. Connect the ground strap to the engine.
  24.  
  25. Connect the transaxle cooler lines ( automatic trans. only).
  26.  
  27. Connect the fuel pump relay and oxygen sensor connectors, fuel lines at the throttle body and filter and all vacuum hoses.
  28.  
  29. Connect the throttle and shift cables and install the air cleaner assembly.
  30.  
  31. Connect the engine and ECM electrical harness.
  32.  
  33. Install the rear console.
  34.  
  35. Refill the engine with the specified coolant and the proper viscosity engine oil.
  36.  
  37. Connect the negative (-) battery cable.
  38.  
  39. Evacuate and recharge the air conditioning system. Refer to the Air Conditioning System recharge and evacuate procedures in .
  40.  
  41. Install the sail panel trim below the battery side panel.
  42.  
  43. Install the engine compartment lid and side panels with an assistant.
  44.  

6-2.8L Engine


Click image to see an enlarged view

Fig. Fig. 9 Exploded view of the engine mounts and torque strut-V6 engines



Click image to see an enlarged view

Fig. Fig. 10 Exploded view of the cradle and transaxle nuts-V6 engines

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Position a suitable drain pan under the radiator and drain the engine coolant.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Mark the engine compartment lid hinges for proper installation.
  2.  
  3. Remove the rear engine compartment lid and side panels with an assistant.
  4.  


CAUTION
Personal injury may result if the engine compartment lid torsion rod retaining bolts are removed. The torsion bolts do not have to be removed to remove the compartment lid.

  1. Remove the intake flex duct and the throttle body elbow.
  2.  
  3. Position a suitable drain pan under the engine and disconnect the radiator and heater hoses.
  4.  
  5. Disconnect the vacuum hoses not engine mounted.
  6.  
  7. Fuel pressure relief procedures: connect a fuel gauge part No. J 34730-1 or equivalent to the fuel pressure valve on the fuel rail assembly. Wrap a towel around the fitting while connecting the gauge to prevent fuel spillage. Install the bleed hose into an approved container and open the valve to bleed the system pressure.
  8.  
  9. Remove the fuel lines from the throttle body and fuel filter.
  10.  
  11. Disconnect the transaxle cooler lines (automatic only). Disconnect the slave cylinder and shield on the (manual trans.).
  12.  
  13. Remove the ground strap from the engine.
  14.  
  15. Disconnect the engine wiring harness at the junction block.
  16.  
  17. Discharge the air conditioning system, if so equipped.
  18.  


CAUTION
Please refer to before discharging the compressor or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.

  1. Remove the rear console.
  2.  
  3. Disconnect the ECM wiring harness at the bulkhead panel.
  4.  
  5. Remove the engine strut front bolt.
  6.  
  7. Install the engine support fixture and support bracket part No. J28467 and W/J35563.
  8.  
  9. Raise the vehicle and support with jackstands.
  10.  
  11. Remove the rear wheels.
  12.  
  13. Remove the parking brake cables and calipers. Wire the caliper to the body so that the brake hose is not damaged.
  14.  

To retain the camber setting on the rear wheels, scribe legible marks on the adjusting bolt.

  1. Loosen the four cradle bolts.
  2.  
  3. Lower the vehicle.
  4.  
  5. Support the engine, transaxle and cradle assembly on a dolly. Refer to the Engine removal and installation illustration in this section.
  6.  
  7. Remove the four cradle bolts and lower onto the dolly and remove the engine support fixture No. J28467.
  8.  
  9. Raise the vehicle leaving the engine/transaxle and cradle assembly on the dolly.
  10.  
  11. Separate the engine from the transaxle. Place the engine on a suitable engine stand.
  12.  

To install:

  1. Reconnect the engine and transaxle on the cradle.
  2.  
  3. Lower the vehicle over the dolly.
  4.  
  5. Install the cradle bolts in sequence as below.
  6.  
    1. Install the front bolts finger-tight.
    2.  
    3. Torque the bear bolts to 76ft. lbs. (103 Nm).
    4.  
    5. Torque the front bolts to 66 ft. lbs. (90 Nm).
    6.  

  7. Raise the vehicle and support with jackstands. Install the MacPherson strut bolts. Align with the marks previously scribed.
  8.  
  9. Install the brake caliper and parking brake cable.
  10.  
  11. Connect the air conditioning wiring, if so equipped.
  12.  
  13. Install the torque converter bolts and tighten (automatic transaxle).
  14.  
  15. Install the rear wheels and torque the lug nuts to 100 ft. lbs. (134 Nm).
  16.  
  17. Lower the vehicle.
  18.  
  19. Install the engine strut bracket.
  20.  
  21. Connect the radiator and heater hoses and tighten clamps.
  22.  
  23. Connect the ground strap to the engine.
  24.  
  25. Connect the transaxle cooler lines (automatic trans. only).
  26.  
  27. Connect the fuel pump relay and oxygen sensor connectors, fuel lines at the throttle body and filter and all vacuum hoses.
  28.  
  29. Connect the throttle and shift cables and install the air cleaner assembly.
  30.  
  31. Connect the engine and ECM electrical harness.
  32.  
  33. Install the rear console.
  34.  
  35. Refill the engine with the specified coolant and the proper viscosity engine oil.
  36.  
  37. Connect the negative (-) battery cable.
  38.  
  39. Evacuate and recharge the air conditioning system. Refer to the Air Conditioning System recharge and evacuate procedures in .
  40.  
  41. Install the sail panel trim below the battery side panel.
  42.  
  43. Reconnect the negative (-) battery cable.
  44.  
  45. Install the engine compartment lid and side panels with an assistant.
  46.  

 
label.common.footer.alt.autozoneLogo