Diagnostic Test

CHECKING THE ENGINE MECHANICAL SYSTEM 

1. Turn the ignition off.
2. 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)
   • 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 in accordance with the service information.
   • Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance. For 16V, refer to POWERTRAIN VERIFICATION TEST, 16V . For 16V Turbo, refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .

   No 

   • Test Complete.