Lack of Power, Sluggishness, or Sponginess. Chevrolet Express 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Express 🢒 Engine 🢒 Engine Controls - 6.5L (L65) 🢒 Lack of Power, Sluggishness, or Sponginess

Checks

Action

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

Preliminary Checks

•	Refer to Symptoms .

•	Compare the vehicle with a similar unit. Make sure that the vehicle has an actual problem.

•	Remove the air filter.

•	Check for dirt, or for air ducts being plugged. Clean and replace if necessary.

•	Inspect the transmission shift pattern and the down shift operation.

•	Check the fuel quality.

•	Check the engine oil level and quality.

Fuel System Checks

•	Check the fuel supply to the injection pump and the fuel return from the injection pump. Refer to Fuel Supply System Check .

•	Check the fuel pump operation. Refer to Fuel Supply System Check .

•	Check for malfunctioning fuel injection nozzles. Refer to Injection Nozzle(s) Diagnosis .

Exhaust System Checks

•	Check the exhaust system for a possible restriction. Refer to Restricted Exhaust System Check in Exhaust Systems.

•	Inspect the exhaust system for damaged or collapsed pipes.

Air Intake System Checks

•	Check for an air leakage or a restriction in the air inlet ducts or the intake manifold.

•	Check for a worn or a damaged turbo charger turbine wheel, shaft or compressor wheel.

Engine Mechanical Check

Check the engine for the following:

•	Low compression

•	Improper valve timing

•	Improper or worn camshaft

Additional Checks

•	Check the control module grounds for being clean, tight, and in their proper location.

•	Check the torque converter clutch (TCC) operation.

•	Check the A/C operation. Refer to System Performance Test in Heating, Ventilation, and Air Conditioning.

•	Check the generator output voltage. Repair if less than 9 or more than 16 volts.