Base Engine Misfire with Abnormal Valve Train Noise
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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 rocker arms The rocker arm bearing end caps and/or needle bearings should 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 to not 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 and valve lash adjusters. |
| Sticking lifters | Replace as required. |