Thread: Exhaust leak?
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Old 10-22-2012, 06:44 PM
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Fast Bob Fast Bob is offline
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Quote:
Originally Posted by QAfred View Post
FB, still curious on the answer to your question. Could you enlighten us?
What could both scenarios be?

More pronounced as revs are rising = ?

More pronounced as revs are on downrev/decreasing = ?

reason I ask is that OP has one issue (rising RPM rattle / noise) I have the other (vibration on downrev at 2000 to 1800).
Cleaning ICV (and MAF/DISA while they were out) cured most of my vibration on the downrev...70%.
From my personal observations, VANOS rattle typically occurs between 1800 and 3000....while still present, it seems to be a little less pronounced when under load (i.e., "on the uprev"). The "marbles in a coffee can" noise seems more pronounced as the revs descend below 3 grand, with less load on the engine.
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