[s-cars] UrS4 running Lean fuel mixture

[Mark Strangways]

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 
> 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 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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