GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Tracker - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Lack of Power, Sluggishness, or Sponginess

Lack Of Power, Sluggishness, Or Sponginess

Checks

Action

DEFINITION: The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.

Preliminary Checks
    • Refer to Symptoms - Engine Controls .
    • Compare the vehicle with a similar unit in order to determine if the customer has an actual problem.
    • Remove the air filter element and check for dirt or restrictions.
    • Check the transmission shift pattern and down shift operation.

Fuel System Checks
    • Check for a restricted fuel filter or incorrect fuel pressure.
    • Check the fuel injectors. Perform the Fuel Injector Coil Test Procedure and the Fuel Injector Balance Test Procedure. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) and Fuel Injector Balance Test with Special Tool .
    • Check for contaminated fuel.

Ignition System Checks
    • Check for the proper secondary voltage output with a J 26792 spark tester, or an equivalent. Refer to Electronic Ignition (EI) System Diagnosis .
    • Inspect the spark plugs for correct operation and performance. Refer to Spark Plug Inspection .

Exhaust System Checks
    • Check the exhaust system for a possible restriction.
    • Inspect the exhaust system for damaged or collapsed pipes. Inspect the muffler for heat distress or a possible internal failure.

Additional Checks
    • Check the exhaust gas recirculation (EGR) valve for excessive flow or sticking open. Refer to Exhaust Gas Recirculation (EGR) System Diagnosis .
    • Check the generator output voltage.

Engine Mechanical Check
    • Check for any of the following engine mechanical problems:
       - Low compression
       - Incorrect valve timing
       - Incorrect or worn camshaft
    • Refer to Engine Compression Test in Engine Mechanical.