[A4] Stumbling at low RPMs

Nicholas Stock nickstock at gmail.com
Mon Jul 28 11:22:50 PDT 2008

I had a very similar problem on my old 2000 1.8T. It was indeed a vacuum
leak as some of the braided hoses had become brittle. I replaced them all
with some decent silicone hose and the problem went away. I think the reason
it may happen at low RPM is that the vacuum is low...the higher the vacuum
becomes may help to suck the tear/rupture back in to place? Just an idea...



On Mon, Jul 28, 2008 at 10:59 AM, Derek Pulvino <dbpulvino at hotmail.com>wrote:

> Car is a 99-A4 w/V6.
> As of late noticing a stumbling/missing on acceleration at low rpms.
>  Usually notice it from about 500- to 1500-rpms when accelerating at part
> throttle.  Car idles fine and not getting any "check engine" light
> illuminations.  If on say 1st gear acceleration I keep the rpms up at 1200
> to 1500 and slip the clutch a bit it doesn't happen, and never see it
> occurring during freeway cruising or otherwise. Also seems to have gotten
> worse with the warmer weather, but that may also just be a coincidence.
> As I don't have a VAG-Com, haven't been able to check for fault codes.
>  Guessing that would be a good place to start, but otherwise, any other
> ideas?  Would almost seem like a vacuum leak, but not sure why it would only
> occur at low rpms.
> derek
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