Lack of Power, Sluggishness, or Sponginess

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Inspections	Action
DEFINITION: The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.
Preliminary	Refer to Symptoms - Engine Controls . Compare the customer vehicle with a similar unit. Verify the customer concern. Remove the air filter and check for dirt or a restriction. Inspect the transmission shift pattern and the downshift operation. Refer to Symptoms - Automatic Transmission in Automatic Transmission.
Fuel System	Inspect for a restricted fuel filter, contaminated fuel, or improper fuel pressure. Refer to Fuel System Diagnosis . Perform the fuel injector balance test. Refer to Fuel Injector Balance Test with Tech 2 and Fuel Injector Balance Test with Special Tool .
Exhaust System	Inspect the exhaust system for a possible restriction. Refer to Restricted Exhaust in Engine Exhaust. Inspect the exhaust system for damaged or collapsed pipes. Inspect the muffler for heat distress or a possible internal failure.
Additional	Inspect the control module grounds for being clean, tight, and in their proper location. Refer to Power and Grounding Component Views in Wiring Systems. Inspect the torque converter clutch (TCC) operation. Refer to Torque Converter Diagnosis Procedure in Automatic Transmission. Inspect the A/C operation. Refer to HVAC Compressor Clutch Does Not Engage or HVAC Compressor Clutch Does Not Disengage in HVAC Systems- Manual. Monitor the knock sensor (KS) system for retarded timing.
Engine Mechanical	Inspect the engine for the proper operation of the following items: Engine compression-Refer to Engine Compression Test in Engine Mechanical. Valve timing Improper or worn camshaft-Refer to Camshafts Cleaning and Inspection in Engine Mechanical.