For 1990-2009 cars

Checks | Actions
--- | ---
DEFINITION: Engine delivers less than expected power. Verify customer's vehicle has an actual problem by comparing it to a similar vehicle.
Air Filter | Check air filter for restriction.
Fuel Filter | Check for restricted fuel filter.
Fuel | Check for contaminated fuel.
Fuel Pressure | Check for improper fuel pressure.
Exhaust System | Check exhaust system for restriction.
Generator charging output voltage | Repair if less than 13 volts or more than 16 volts with engine running and all accessories off.
Engine |

• | Verify engine has no mechanical knock or spark knock. If knock is present, engine timing will be retarded and loss of power will result. View spark modifiers on a scan tool.

• | Check engine valve timing, compression or worn camshaft.

Spark Plugs | Check for worn spark plugs.