[A4] Stumbling at low RPMs
dbpulvino at hotmail.com
Mon Jul 28 12:17:10 PDT 2008
Thanks for input. I did recently go through and change I think all but one or two of the EGR vacuum lines with new runs. Maybe those are the culprit. I was prompted by an intermittent EGR system leak that was picked up when I ran a diagnostic with a borrowed VAGCOM.
Maybe I'll have to take another gander, although getting to the point where I'm willing to pay a shop to troubleshoot this for me.
Say, anyone have a recommendation for an independent Audi shop in Seattle proper? I've used Redmond Workshop in the past, but it'd be nice to find someone a little closer to home.
Date: Mon, 28 Jul 2008 11:22:50 -0700
From: nickstock at gmail.com
To: dbpulvino at hotmail.com; a4 at audifans.com
Subject: Re: [A4] Stumbling at low RPMs
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.
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