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Engine Specific Info and Questions => IDI Engine => Topic started by: akl on November 20, 2004, 04:31:47 pm
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I drive a 1.9TD and I'm experiencing a very loud rattle at 2900 rpm. It seems to be coming from the valve train area but I could be wrong. I've recently had the motor apart and everything appeared to be normal. Anyone heard of this before?
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I've recently had the motor apart
Did it make the noise before you had it apart?
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yes, no change in the noise from before to after.
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Is your noise present at any other engine speed? If not it seems like resonance. My AAZ had a very bad exhaust resonance at 2800rpm. Get a helper to place their foot on the tailpipe while you rev the engine to the noisy rpm, if the noise goes away you have found the problem. I added a longer flex joint at the downpipe to fix mine. Also get under the car and tap on the catalytic converter with a rubber hammer and listen for rattles. The cat has been known to come apart inside. I don't know what else could vibrate at such a specific RPM.
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Thanks for the prompt reply. The noise starts specifically at that rpm, is bad for about 400 rpm then slowly tapers off. It sounds to me more like a mechanical vibration but I will definately check out the exhaust. Thanks
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I have an 87 vw golf 1.8 automatic and it always makes a weird noise at about 1800-2000 rpm. It goes away when the engine rpm is not in that range. I never liked automatic anyway (except for the laziness) so i just left it and never gave me any problems. I now drive a 1.6L TD :D and the golf still runs (even though I drove the piss out of it!!!)