Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Check for the following items:
- A loose or missing distributor hold down bolt.
- A loose CMP sensor causing a variance in the sensor signal.
- An incorrectly installed distributor - one tooth off in either advance or retard positions.
- A loose distributor rotor on the distributor shaft.
- Excessive free play in the timing chain and gear assembly.