Stumble

[brian hoeft]

To the first part, not necessarily. If the female pin(s) is(are) loose due
to widening over time or if the burgundy colored plastic spacer is missing
for example, there could be a point that the vibration of whatever engine
speed brings about the symptoms, but that is pretty rare and doubt this is
your problem.

Next, in short, no. The throttle body can adapt pretty well, but even on
earlier models,  will run surprisingly well with MAF disconnected and a
moderate/severe boost leak. For example, my 95 S6 blew an intercooler hose
while swiftly exiting a toll booth, car shut off, i disconnected the MAF
and drove to the next safe place to crawl under and replace without
noticing a problem along the way, though I was babying it at that point.

Fabricating a pressure tester is pretty easy and on that car not difficult
to do. You might find a model specific write-up on one of the fancier
forums with picture hosting, etc..

If you have Vag-Com, aghem, I mean VCDS, you could fare well with a
Throttle Body Alignment and checking/logging the group that shows MAF
function to see if is in accordance with throttle position and/or engine
speed. Great investment either way.


On Mon, Dec 5, 2011 at 9:47 AM, Dan DiBiase <d_dibiase at yahoo.com> wrote:

> Thanks for the response, Brian.... I think the harness is okay, as it
> 'clicked' right in when I reinstalled the plug, and the ESP
> light went off as well. I assume it would not do that if the wiring was
> somehow messed up...?
>
> If I had an air leak would that affect the idle? The car idles very
> smoothly. The only symptom is that 'stumble' around 2500 rpm
> that goes away with the MAF unplugged.
>
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
>
>   ------------------------------
> *From:* brian hoeft <qweblog at gmail.com>
> *To:* Dan DiBiase <d_dibiase at yahoo.com>
> *Cc:* "cobram at juno.com" <cobram at juno.com>; "quattro at audifans.com" <
> quattro at audifans.com>
> *Sent:* Sunday, December 4, 2011 3:38 PM
> *Subject:* Re: Stumble
>
> Dan, The ECU(s) look to the MAF to calculate load, so the traction control
> won't like it when you disconnect it. As for your better running condition,
> just beware that you could have an air leak somewhere and disconnecting the
> MAF goes to pre-programmed igntition timing/fueling and might be a false
> positive, so before you go buy a new MAF, just give a thorough look to all
> your hoses. Also, I recently fixed a MAF plagued customer who had a wild
> DIY streak. He broke the MAF harness and killed 2 (ebay) MAF's before
> towing it to me. Bought a new MAF, harness, re-pinned it, and the car was
> happy. Worth a look there too, to make sure the pins are tight.
>
> good luck.
>
>
>
> On Fri, Dec 2, 2011 at 2:20 PM, Dan DiBiase <d_dibiase at yahoo.com> wrote:
>
>
> ________________________________
>  From: "cobram at juno.com" <cobram at juno.com>
> To: d_dibiase at yahoo.com
> Cc: quattro at audifans.com
> Sent: Sunday, November 13, 2011 4:06 PM
> Subject: Re: Stumble
>
> Dan DiBiase <d_dibiase at yahoo.com> writes:
> > I cleaned the MAF today. Car seems to run better but I am going to
> > see over the next few days if
> > it really is or whether it is just my imagination..... AutoZone
> > would not check for stored codes since
> > the CEL was not on.
> >
> > Dan D
> > '04 A4 1.8Tq MT-6
> > Central NJ USA
>
> There may be pending codes.  Remove the gas cap, that should trigger a
> CEL which won't interfere with any pendings.
> Scanners are really cheap these days, or get some torrent software and a
> $5 OBD cable on FleaBay, or a bluetooth for about $20.
> ---------------------------------------------------------------
> Haven't had a chance to do this, but I did decide to unplug the MAF and
> see what happened. The car runs 100% better - no
> stumble - after doing that, so I guess the MAF is indeed the culprit - it
> needs more than a cleaning. So I will look to order
> one and replace it.
>
> BTW, I thought it strange that the VSC light came on when I unplugged the
> MAF, and shut off when I plugged it back in. Why
> would that be?
>
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
> _______________________________________________
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>
>
>
>
> --
> *       -Brian*
>       [blinders off&ear <http://208.53.138.125:8068/>plugs out]
>
>
>


-- 
*       -Brian*
      [blinders off&ear <http://208.53.138.125:8068/>plugs out]