Base Engine Misfire with Abnormal Valve Train Noise
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Base Engine Misfire with Abnormal Valve Train Noise
| Cause | Correction |
|---|---|
| Worn or loose valve rocker arms (The rocker arm bearing end caps and/or needle bearings should be intact within the rocker arm assembly.) |
Replace the valve rocker arms as required. |
| Stuck valves (Carbon buildup on the valve stem can cause the valve not to close properly.) |
Repair or replace as required. |
| Excessively worn or mis-aligned timing chain | Replace the timing chain and sprockets as required. |
| Worn camshaft lobes | Replace the camshaft, valve lash adjusters, and rocker arms. |
| Sticking valve lash adjusters | Replace as required. |