[Biturbos4] driving without working MAF

[David Kavanagh]

This link should provide a bunch of info for checking the MAF and
understanding how the ECU tries to correct via fuel trim.
http://forums.vwvortex.com/zerothread?id=1201806

I just checked my codes again tonight (after resetting a couple days
ago) and got.

2 Faults Found:
17538 - Fuel Trim: Bank 2 (Mult): System too Lean
        P1130 - 35-10 - - - Intermittent
17536 - Fuel Trim: Bank 1 (Mult): System too Lean
        P1128 - 35-10 - - - Intermittent

I forgot to check measurement block 032 (which would have told me how
much the ECU had to correct for the MAF) I'll check those next time I
see these codes.

BTW, I have a '00 A6 2.7t 6-speed... (wouldn't mind an S4 though!)

----- Original Message -----
From: j y <jimnetpa at yahoo.com>
Date: Wed, 21 Jul 2004 15:09:55 -0700 (PDT)
Subject: Re: [Biturbos4] driving without working MAF
To: David Kavanagh <audiguy at gmail.com>
Cc: biturbos4 <biturbos4 at audifans.com>


Hey David,

 

Good stuff. 

 

What year is your S4? I have a Y2K and that's the MY where most of the
failures have occurred I believe. I have a VAG and will check block
003 - if my MAF is working properly - what code should it be
displaying?

 

So far (fingers crossed), I have no CELs and I'm a stage 2.5 (LeBree
DPs, AWE TWIN2 dual exhaust, GIAC-X chip, GIAC Tip chip, AMS TBB,
Stratmosphere DVs, SAMCO hoses, EVO intake/airbox) tip with 75k mi
(i've had it since day one).

 

jy





David Kavanagh <audiguy at gmail.com> wrote:



Thanks for all of the replies. Here is some more data (for the
curious). Back in April, it had a CEL. I got the VAG-COM printout from
the independent dealer I was working with and it showed a fuel trim
adjustment was made and some lean indications. Right away I suspected
the MAF, but they cleared the codes and said, let us know if it comes
back. Well, 3 weeks ago, it came on again, but I couldn't get into the
shop until the following Monday, and by then the CEL was out. I had
them hook it up anyway and they said there weren't any codes.
I got my own VAG-COM a week ago and hooked it up right away. I saw
some codes, 1 about a lean condition and several misfire codes. I ran
a 2nd gear acceleration test 2 days ago with the VAG-COM logging RPM,
MAF output, engine load and ignition timing (block 003 for those with
the tool). It showed a low MAF output
 signal. So, I think it has been
failing slowly over time and the ECU has been correcting by adjusting
the fuel trim settings. I'll have to hook up and look at those to see
how far away from zero they are. (though, it its normal for them to be
non-zero).
Without a related code, the dealer (and Audi) won't replace it under
the extended warranty for that part. I'm not terribly interested in
replacing it out of pocket. Given how it is failing, I think I'll just
take my chances (and bring my VAG-COM along). I have the phone # for
the Audi dealership in Ottawa (where we are going) and I'll hope for
the best.

Thanks!

David
-- 
'00 A6 biturbo 6-speed
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-- 
'00 A6 biturbo 6-speed