Corolla 2006 with 3ZZ-FE engine got a rattle at idle:
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Noise is there only with engine warm. Car has 45,000 miles. At the dealer they suggested it may be a worn chain liner.Help with identifying 3ZZ-FE rattle at idle
Mar 20, 2012
2 Replies
Noise does not seem to increase in intensity or freqency with RPM. I would remove all belts and run engine for a very short time (no cooling) and see if the noisc is still there, I think it is a pully (bearing) making the noise. Not a real issue and will get progressively worse before failing. You will have plenty of warning before it fails.
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Also check your PCV valve. Perhaps a spring broke or is weak and allowing the metal valve inside to rattle. Just disconnect it to test idea.
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