Lack of Power, Sluggishness, or Sponginess

DEFINITION: Engine delivers less than expected power.

^ Verify customers vehicle has an actual problem by comparing it to a similar vehicle.

Check:
^ Restricted air filter.
^ Restricted fuel filter, contaminated fuel or improper fuel pressure.
^ Exhaust system for restriction.
^ Generator charging output voltage. Repair if less than 13 volts or more than 16 volts with all accessories off.
^ Verify engine has no mechanical knock or spark knock. If knock is present, engine timing will be retarded and loss of power will result.
^ Engine valve timing, compression or worn camshaft.