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 coolant level. Check cooling system thermostat for proper operation and application.
- Check for restricted airflow to radiator or restricted coolant flow through radiator.
- Check for loose water pump belt.
- Check Engine Coolant Temperature (ECT) sensor, reading should be within 5°F of ambient air temperature on a cold engine.
- Inspect the Fuel Rail Pressure (FRP) sensor. Use the scan tool to observe FRP with ignition on and engine off. FRP should be 1.1-1.4 MPa. If FRP is not within this range, check for high resistance in the low reference or 5-volt reference circuits or the sensor, or a faulty sensor.
- Inspect for an intermittent Crankshaft Position (CKP) sensor signal.
- Inspect CKP sensor reluctor wheel. Remove CKP sensor and attempt to move the reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose.
- Check fuel injection pump and timing. See appropriate ON-VEHICLE ADJUSTMENTS article.
- Check injector nozzles. See appropriate SYSTEM & COMPONENT TESTING article.
- Inspect fuel delivery system. Check for no fuel to injection pump or air in fuel system. See BASIC FUEL SYSTEM CHECKS (DIESEL) in appropriate BASIC DIAGNOSTIC PROCEDURES article.
- Check for incorrect basic engine parts such as camshaft, cylinder heads and pistons.
- Check for excessive blow-by.