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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 442 (Engine Controls - Trouble Shooting - No Codes) >> Symptoms >> Lack Of Power, Sluggish Or Spongy >> Engine Mechanical

Engine Mechanical

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that the Engine Coolant Temperature (ECT) is not above 266°F (130°C). This condition causes the PCM to operate in Engine Coolant Over Temperature-Fuel Disabled Mode. While in Engine Coolant Over Temperature-Fuel Disabled Mode, the PCM will disable the fuel injectors to 4 cylinders at a time to keep engine temperatures from reaching damaging levels. The system perceives the Engine Coolant Over Temperature-Fuel Disabled Mode as a lack of power, miss, or rough idle. If the vehicle operates in Engine Coolant Over Temperature-Fuel Disabled Mode, see appropriate article in ENGINE COOLING.
  2. Inspect for excessive oil in the combustion chambers and leaking valve seals.
  3. Test for low cylinder compression.
  4. Inspect for incorrect basic engine parts, including the following:
    • Camshaft
    • Cylinder Heads
    • Pistons, etc.
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