[s-cars] Possible MAF Issue

[Robert Myers]

Chris,

This "stutter"?  More description please?  Is it just a bit of a 
stumble or does the engine quit completely (just like turning off the 
ignition switch) for a brief interval and then resume running?  If it 
is the latter I had a similar increasingly frequent visitor which 
would come and go without explanation.  Turned out to be a failing 
(and finally completely failed) CPS.  No code was ever thrown.

Bob



At 02:49 PM 12/29/2008, Chris Hawkins wrote:
>Hey Paul,
>
>
>
>Much thanks, hope you had a great Christmas with the fam as well.
>
>
>
>Can't be the POS because I swapped out to the 034 HO Coil Kit which
>eliminates the Pieces..OS.  I wish I could capture a moment when idling to
>have a chance to pull injector plugs, etc. but it never lasts long enough at
>idle to do anything.  Every time I've tried the issue disappears as I'm
>opening the hood or before I can even get out of the car.  The issue happens
>so randomly it's driving me nuts.  Only time I can reliably recreate the
>stutter is under some heavy throttle in 3rd to 6th but pulling injector
>plugs is out of the question at those speeds ;-).  Longest duration was
>about 2 minutes while driving on the Merritt in moderate traffic, never had
>the chance to pull over.
>
>
>
>MAF has been carefully cleaned with CRC MAF cleaner when I took everything
>apart for the upgrades.
>
>
>
>Do you know how limp mode is achieved, ie; what does the ECU do to reduce
>power?
>
>
>
>Thanks again.  We'll definitely catch up for a spin soon.
>
>
>
>Chris
>
>
>
>   _____
>
>From: pkrasusky at ups.com [mailto:pkrasusky at ups.com]
>Sent: Monday, December 29, 2008 8:52 AM
>To: s-car-list at audifans.com; ripit69 at comcast.net
>Subject: RE: Possible MAF Issue
>
>
>
>
>
>Chris missed:
>
>
>
><<<Date: Sun, 28 Dec 2008 15:59:52 -0500
>
>From: "Chris Hawkins" <ripit69 at comcast.net>
>
>Subject: [s-cars] Possible MAF Issue
>
>
>
>Happy Holidays to all.  I'm trying to chase down a miss or apparent limp
>
>mode issue with my '95 UrS6.  Issue began about a month before I installed a
>
>bunch of RS2 upgrades.  Before the upgrades the car had stock K24,
>
>injectors, MRC 2+ custom(Paul K. tune) & FMIC.
>
>
>
>I don't have a VAG-COM(yet, ordered one the other day.  Thanks Santa.) but
>
>the only blink code I got was 2121.  The stutter appears randomly, at idle
>
>or any other throttle position to WOT and at any speed.  It disappears just
>
>as randomly.  It generally doesn't last too long, anywhere from about 2 sec.
>
>to a few minutes.  Fuel filter is new, coils are new 034 HO, injectors are
>
>new 034 RS2 reps, fuel pump is original OE to the best of my knowledge,
>
>however I have a 044 HO pump going in soon, software is the 034 RS2 tune.
>
>
>
>My initial suspicions were coil or fuel pump but the stuttering reminds me
>
>of a MAF issue I had on a normally aspirated '95 90 a few years ago.  The
>
>sensor turned out to be bad, replaced it with a known good one and the issue
>
>went away.  Code 2121 mentions possible throttle CTP or throttle
>
>cable/dashpot adjustments but I'm not sure if that would cause the random
>
>power loss I'm experiencing.  I re-checked all of my work and the
>
>connections from the upgrades, before I get knee deep in testing the coils &
>
>fuel pump, etc. are there any BTDT with the same symptoms?  I'm really
>
>curious if I'm looking at a MAF issue instead.  Any spare AAN/RS2/P968 MAF's
>
>laying around just in case?
>
>
>
>Chris>>>
>
>
>
>
>
>
>
>
>
>Hey Chris-
>
>
>
>This onset / offset misfire sounds verrrrrymuch like a POS failure that
>cropped up on me in that car yearsss ago.  It would come / go / come / go
>until it eventually (within a few daze) it was a full time miss.  Much
>different sensation / scenario than my coil failure.
>
>
>
>To repair I utilized the Get Out Of Jail Free POS "spare channel" (@ Jim P's
>in Maine whilst on vacay no less, with Batphone into Domo Oregato Mr.
>Bobatto to handhold me thru heh heh), so sowwy Charlie - you'd have to get a
>new POS.  They're OE in there unless you've swapped so 180k or whatever
>ain't shabby.
>
>
>
>You're lucky if you can get it to miss @ idle, simply jump out and yank
>injectors until one don't make no difference - voila - isolated which jug is
>'off'.
>
>
>MAF was OE too and I did run a K&N at one point, mebbe it 'shortened' it's
>life or maybe it's just on way out due to newfound RS2 and the mileage.  Try
>spraying the MAF connection with contact cleaner, can't hurt.
>
>FWIW, CPS was new (splice in from the Steve Y. GP) when I did the tbelt the
>month prior to your getting it.  Fuel pump was new at some point tho it
>could always fail again / early certainly.
>
>My bet's on POS tho based on your symptoms and considering their age, etc.
>
>
>
>Hope you had a great Christmas with the family, etc.  Back to der grind
>today, grrrr.  Beerz soon!  I reeeeally want to check the beast out with the
>RS2 gear heh heh...
>
>
>
>-Paul
>
>
>
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