[s-cars] UrS4 running Lean fuel mixture

Dave Tremblay da_trem at hotmail.com
Fri Feb 13 05:07:50 PST 2009

No cold starts issues, same as with the old fuel pump. dtperformance.spaces.live.com450-588-5495 

Date: Thu, 12 Feb 2009 21:25:08 -0500Subject: Re: [s-cars] UrS4 running Lean fuel mixtureFrom: abeckert at gmail.comTo: da_trem at hotmail.comCC: s-car-list at audifans.comDid you do the walbro install?  Any issues with cold starts?
On Thu, Feb 12, 2009 at 6:21 PM, Dave Tremblay <da_trem at hotmail.com> wrote:
Hi all,i'm having issues with fuel mixture with my  93' S4. About two weeks ago i've noticed on my wideband lean mixture readings while cruising and on boost.I've always seen 14.5-15 afr(cruise) and 11.5-11.8afr on boost. Now what im seeing is 15.5-17(cruise) and 13.5-14(boost)The car as MRC stage 2, K26#8 and a fmic for a long time now, never had a single problem with it. Motor always run on 94 oct.Boost pressure is the same as before and it dosent miss or anything..no leaks after the maf or after the turbo. Car is very well maintained.Last work done recently:New 4 bar fprRelayed Fp255 walbro fuel pump, about 2 months oldFuel filter as 20kNew O2 sensorNew hall senderThe ecu trows no codes.Now my question is, could a bad maf cause these problems?...Your input on this is greatly appreciated!________________________________________________________________________________________________________________S-CAR-List mailing listS-CAR-List at audifans.comhttp://www.audifans.com/mailman/listinfo/s-car-list

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