[s-cars] UrS4 running Lean fuel mixture
StrangConst at rogers.com
Thu Feb 12 17:16:17 PST 2009
my bet would be the FPR.
if it's out it will change the mix lots.
----- Original Message -----
From: "Dave Tremblay" <da_trem at hotmail.com>
To: "s-car-list" <s-car-list at audifans.com>
Sent: Thursday, February 12, 2009 6:21 PM
Subject: [s-cars] UrS4 running Lean fuel mixture
> 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
> 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 fpr
> Relayed Fp
> 255 walbro fuel pump, about 2 months old
> Fuel filter as 20k
> New O2 sensor
> New hall sender
> The ecu trows no codes.
> Now my question is, could a bad maf cause these problems?...
> Your input on this is greatly appreciated!
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