[Vwdiesel] 02 TDI, faint tapping when under load

[Doyt W. Echelberger]

Er... I read my own post and didn't think it helped at all. Please delete 
it. Embarrassing. Holiday madness.
My mind has finally snapped.....

Please let me try again.

Tad's suggestion sounds like it would be helpful. He is asking ....Would it 
tap if you used the brakes to hold against forward motion and reved the 
engine?  That would eliminate any tire/wheel/CV joint/drive axle source, 
yet it would be under load. If it tapped the same, you would suspect it was 
an engine or tranny component.
Doyt
 >>>>>>>>>>>>>>>>>>>

/>>>>>>>>>>>>>>>>>>>
>On Dec 18, 2011, at 6:52 PM, Stephen Sherman wrote:
>
> > My new to me 02 Jetta TDI has a faint tapping noise which has me 
> concerned. I've had a few people listen to it, and opinions vary, some 
> thinking it is in the dash, others (including me) thinking it is coming 
> from the engine or drivetrain.
> >
> > Symptoms are that when the engine is under load, accelerating or going 
> up hill, there is a faint tap, tap tap noise.  If you let up on the go 
> pedal, the tapping stops immediately (so it doesn't seem like it could be 
> wheel/tire related), and resumes as soon as you push on the pedal 
> again.  It does not tap if you just have it in neutral and rev the 
> engine, no load.  The frequency of the tapping varies a bit but is 
> generally in the 5-10 taps per second range (just rough counting here). 
> I've tried to notice if it changes frequency around gear shifts (auto 
> tranny) but have not gotten anything conclusive.
> >
> > I have tried listening with a mechanics stethoscope, but did not hear 
> anything that seem to be it (again doesn't tap when not under load. I 
> have checked the CV joints, and no obvious play in any of them.
> >
> > Any other things to check out? Ideas on what it might be?
> >
> > TIA
> >
> >
> >
> >


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