COLD START "ONLY" BRIEF RATTLE - Club Touareg Forums
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post #1 of 16 Old 3 Weeks Ago Thread Starter
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Unhappy COLD START "ONLY" BRIEF RATTLE

OK., so this is only on cold start that I get this temporary rattle for about 3 seconds, then all sounds fine. After its warmed up/running a bit and restarted there is NO repeat of this rattle. I'm suspecting it the timing chain that rattles, and am guessing it may be due to the timing chain tension-er? Does anyone know if they are oil pressured to tension the chain? It's about a 30 hour job to get a tension-er replaced (no small feat) !!! Has anyone had any experience here?
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post #2 of 16 Old 3 Weeks Ago
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Not really sure about the TDI's but I've read on here in a thread that the gassers do this on a cold startup until the oil pressure builds up. Maybe the same?


.
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My VR6 3.2 does this with the rpm around 1100 for a few seconds and calms down. Treg was bought second hand. My audi does it too. Audi has always done it from new. System needs to warm up a bit before settling down. It's not a big rattle though, just like you're applying the throttle a bit. There is some mild chain slapping going on then rpm goes to 700/800. Not sure about TDIs.
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post #4 of 16 Old 3 Weeks Ago Thread Starter
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Ok., so is there any danger in just not worrying about it?
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A diesel rattle is caused by diesel rattle (aka diesel clatter).

Cold fuel on start > compression ignition knock. It will also do it under lugging conditions. It's what diesels do.

More noticable post-emissions "fix."

Gary, 13 TDI, Myakka City Florida
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Do you have relatively thick white exhaust right after start that does stop in a short time? Condensate water or coolant might be involved. Seeping through head gasket or EGR cooler.
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Quote:
Originally Posted by Xcentric View Post
A diesel rattle is caused by diesel rattle (aka diesel clatter).

Cold fuel on start > compression ignition knock. It will also do it under lugging conditions. It's what diesels do.

More noticable post-emissions "fix."
Ok. yeah, I know what diesel clatter is... but this is more like a timing chain rattle for the first 2-3 seconds on cold start only as stated above. No smoke (white) on start up, and absolutely no clatter rattle after things are warmed up. I had VW repair a timing chain cover gasket leak 6 months ago. No noise till now? Anyway, a timing chain replacement is like 4 gran, a new engine is more like 11 gran . Don't really care for either.
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post #8 of 16 Old 3 Weeks Ago
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Quote:
Originally Posted by turbospool View Post
Ok., so is there any danger in just not worrying about it?
Are you close to being out of warranty?
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170 I, and the warranty from the emission fix oil not cover this..
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post #10 of 16 Old 3 Weeks Ago
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I don't understand what you just attempted to say.... Translate that to Canadian please....

How much milage on the vehicle?
At what milage and date was the FIX done?
The emission fix will cover a timing chain issue......
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