[V8] new V8 owner; first set of questions.

Gene Caldwell gene.ghc at verizon.net
Sun Jun 5 15:51:58 EDT 2005

Welcome Chris,

Can't say I've had the combination of symptoms that you indicate, but I 
can offer the following.

 From the fault table in the manual:

    * Was the idle speed steady at about 700 rpm?  I can't find those
      VAG-COM numerical values in my manual, but did see the phrase
      "Minimum adaptation limit not obtained" associated with the ISV or
      MAF sensor.  No association of ISV with power loss though.
    * Looking at other symptoms;  high fuel consumption, plug fouling,
      and power loss are associated with things like knock sensor, hall
      sensor, MAF sensor, O2 sensor, fuel pressure over 58psi,

Personal experience:

    * When my mpg dropped from 20 average to about 12, it was the O2
      sensor, although it mostly ran ok with only light power loss. 
      Almost simultaneously, the engine had also developed a very slight
      hesitation on throttle tip-in just off idle, caused by an open
      vacuum line.
    *  From the archives I could see that the fuel pressure regulator is
      a known offender.  I'd heard that a bad FPR could cause
      hydrostatic lock followed by bent rods, so I just put a new one in
      when I first got the car.
    * I initially had leakage and a light burnt oil smell from the
      driver side.  It turned out to be 3 or 4 loose screws on the head
      cover.  The car had just received a timing belt service before I
      bought it (1-2K miles previously), so the cover gasket was still
      like new.

-Gene Caldwell
90 V8
91 200q20v
94 90S
04 GLI 1.8T

Miller, Chris wrote:

>Just drove home a new to me 1993, pearl with black interior, with a
>number of issues.
>Fixed the "loose rack"; got the sunroof to close; currently drying out
>the interior.  The paint clearcoat issues remain...  Need to inspect the
>timing belt as there are few records with the car...then replace the
>front outer CV boot.
>Part way home the fuel mileage suddenly plummetted, and the car ran very
>rich with the check engine light.  On decel (fuel cut) check engine
>light goes out.  At first intermittent; soon became major power loss and
>10mpg.  I'm sure the plugs are pretty fouled.  Managed to limp all the
>way home.
>I borrowed Vag-com and got some codes, but don't have info on them
>handy.  Listed below.
>Several leaks; looks like at the pump (o-rings); plus I get an oil leak
>and smoke at the plenum on the passenger's side.
>No A/C; will have to add a charge to find the leak(s).
>5 Faults Found:
>00561 - Mixture Adaptation
>            13-10 - Adaptation Limit (Mul) Not Reached - Intermittent
>00524 - Shareware Version. To Decode all DTCs
>            03-00 - Please Register/Activate
>00525 - Shareware Version. To Decode all DTCs
>            03-10 - Please Register/Activate - Intermittent
>00537 - Shareware Version. To Decode all DTCs
>            08-10 - Please Register/Activate - Intermittent
>00513 - Shareware Version. To Decode all DTCs
>            03-00 - Please Register/Activate
>Readiness: N/A
>VAG-COM Version: Release  311.2-N
>Control Module Part Number: 441 927 156 Q  
>  Component and/or Version: AG4 GETRIEBE 018    D02 
>           Software Coding: PMC 0
>            Work Shop Code: 0260002199
>1 Fault Found:
>00526 - Brake Light Switch-F
>        03-00 - No Signal
>Chris Miller, Bolton, MA  c1j1miller at aol.com 
>'93 V8, '91 Audi coupe q, '85 Audi 4ksq, '81 VW Scirocco
>'91 200q20v site ==> http://members.aol.com/c1j1miller/welcome.html
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