Lack of Power, Sluggishness, or Sponginess. Chevrolet Kodiak C-Series (Crew) C4/C5 2003

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Kodiak C-Series (Crew) C4/C5 🢒 Engine 🢒 Engine Controls - 6.6L 🢒 Lack of Power, Sluggishness, or Sponginess

Inspection

Action

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

Preliminary Inspection

•	Refer to Symptoms - Engine Controls .

•	Compare the vehicle with a similar unit. Ensure the vehicle has an actual problem.

•	Compare the scan tool data with the scan tool data list while the engine is idling. Refer to Scan Tool Data List .

•	Ensure that the power take off (PTO) switch is in the OFF position.

•	Remove the air filter and inspect for dirt, or for air ducts being plugged or leaking. Repair or replace as necessary.

•	Inspect for a proper transmission operation.

•	Inspect the engine oil level and quality.

Fuel System Inspection

•	Inspect the fuel supply to the fuel injection pump. Refer to Fuel System Diagnosis .

•	Observe the actual vs. desired fuel rail pressure with the engine idling.

•	Start the engine and command the fuel pressure to 160 MPa with a scan tool. If the actual fuel pressure does not reach 160 MPA, go to Fuel System Diagnosis - High Pressure Side .

•	Inspect for restricted or plugged fuel injectors. Refer to Fuel Injector Balance Test with Tech 2 .

Exhaust System Inspection

Inspect the exhaust system for a possible restriction. Refer to Restricted Exhaust in Engine Exhaust.

Air Intake System Inspection

•	Inspect for an air leak or restriction in the air inlet ducts or the intake manifold. Refer to DTC P0234 .

•	Inspect for an air leak in the charge air cooler.

•	Inspect the charge air cooler for a restriction.

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

•	Inspect for a skewed mass air flow (MAF) sensor. Refer to Scan Tool Data List .

Engine Mechanical Inspection

Inspect the engine for the following:

•	Low compression--Refer to Engine Compression Test in Engine Mechanical-6.6L.

•	Improper valve timing

•	Improper or worn camshaft--Refer to Camshaft and Bearings Cleaning and Inspection in Engine Mechanical-6.6L.

Refer to Engine Compression Test in Engine Mechanical-6.6L.

Additional Inspection

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

•	Inspect the torque converter clutch (TCC) operation.

•	Inspect the air conditioning system for proper operation. Refer to Symptoms - HVAC Systems - Manual in HVAC Systems-Manual.

•	Inspect the generator output voltage. Refer to Charging System Test in Engine Electrical.