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VW knocking noises
08-14-2009, 05:53 PM (This post was last modified: 08-14-2009 05:54 PM by TheTutor.)
Post: #1
VW knocking noises
Year: 2000
Model: Beetle
Engine Size: 4 cyl.
Auto/Manual: manual
Mileage: 118539

What makes a 2000 VW Beetle, 2.0 liter engine, single overhead camshaft make a predetonation knock u pon the acceleration of the throttle under 1000 rpm's?
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08-15-2009, 12:22 AM
Post: #2
RE: VW knocking noises
Depends if it is a light pinging type knock , which could be from running lean ,due to things like fuel filter , restricted injectors or carbon buildup on pistons. Or is a sharp hammer on steel knock , which would indicate things such as wrist pin or rod bearing failure . It takes an experianced ear to tell . See if u can get a mechanic to listen to it and then decide how far to go getting an estimate.
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08-18-2009, 10:40 AM
Post: #3
RE: VW knocking noises
Something often overlooked is a clogged EGR passage and I didn't believe it till I found a few myself.

These days the EGR is fed in not only for reduction of emissions but to smooth out the running and reduce ping on acceleration.

The classic symptom of this is the ping only lasts a second when you first hit the gas and after that the knock sensor reduces the ping so you can't hear it any longer. You may also notice the car has a slight reduction in power because the timing is being cut back farther than usual. This problem usually does not set a code in the computer.
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