Possible Causes & Corrections
WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
Check the following items:
- Check fuel quality.
- Check fuel injection pump and timing. See appropriate ON-VEHICLE ADJUSTMENTS article.
- Observe the actual vs. desired fuel rail pressure with a scan tool, with the engine running.
- Check injector nozzles. See appropriate SYSTEM & COMPONENT TESTING article.
- Check Engine Coolant Temperature (ECT) sensor. Reading should be within 5°F of ambient air temperature on a cold engine.
- Inspect the glow plug system operation.
- Inspect the Fuel Rail Pressure (FRP) sensor. Use the scan tool to observe FRP with the engine off. FRP should be 1.1-1.4 MPa. If not, inspect for high resistance in the low reference or 5-volt reference circuits or the sensor.
- Check air filter, turbocharger and air intake system for a restriction.
- Inspect for contamination of the Mass Air Flow (MAF) sensor.
- Perform the engine compression test and a cylinder leakage test.
- Inspect the Intake Air Heater (IAH) for proper operation. Use a scan tool to command the IAH on and off.
- Check for incorrect basic engine parts such as camshaft, cylinder heads and pistons.
- Check for excessive blow-by.
- Inspect for coolant entering the combustion chamber.