Checking the Engine Mechanical System

*CHECKING THE ENGINE MECHANICAL SYSTEM

For complete wiring diagrams refer to Diagrams/Electrical.

Diagnostic Test

1. CHECKING THE ENGINE MECHANICAL SYSTEM

Turn the ignition off.

Check for any of the following conditions/mechanical problems:

- AIR INDUCTION SYSTEM - must be free from leaks and restrictions

- ENGINE VACUUM - must be at least 13 inches in neutral

- ENGINE VALVE TIMING - must be within specifications

- ENGINE COMPRESSION - must be within specifications

- ENGINE EXHAUST SYSTEM - must be free from leaks and restrictions

- ENGINE OIL - must be clean, at the proper level, free from contamination or fuel

- ENGINE PCV SYSTEM - must flow freely

- TORQUE CONVERTER STALL SPEED - must be within specifications

- POWER BRAKE BOOSTER - no internal vacuum leaks

- FUEL - must be free of contamination

- FUEL INJECTOR - plugged or restricted injector(s); control wire not connected to the correct injector

- CAM LOBES - must not be worn excessively

- CYLINDER LEAKAGE TEST - must be within specifications

- VALVE SPRINGS - cannot be weak or broken

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. PCM Verification Test

No

- Test Complete.