Engine Mechanical
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Check for excessive oil in combustion chamber. Check for leaking valve seals. See appropriate article in ENGINES.
- Check for low cylinder compression. See ENGINE COMPRESSION TEST under MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - 4.0L AURORA article.
- Check combustion chambers for excessive carbon buildup. Clean using top engine cleaner. Follow manufacturer's instructions on can.
- Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. See appropriate article in ENGINES.