Gary Martin JH 15371
| Joined: | 03-12-2005 |
| Location: | Portland, OR |
| Posts: | 98 |
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Another posibility would be a cracked piston or piston skirt. When cold the pistons have not expanded to proper tolerances. Older cars need to be warmed up before running at high RPM's. Newer cars have much better piston designs and materials that lessen this problem. If the noise is quite while at idle, but then becomes apparent when the engine is reved up, or when returning to idle, I would suspect a piston. The noise would be simiar to that of a bad rod bearing. If the noise is always there regardless of engine speed, then it could just be something in the valve train. Gary
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