[V8] 1992 Audi V8 4.2 running lean

[Dag Bøsterud]

I changed the oxygen sensor for the second time, along with the temperature sensor to the ECU and a vacuum hose.
The car now runs like a dream.

I do suspect both the first (the car's original) and the second (bought it two monts ago) oxygen sensors to be faulty.

/Dag

  ----- Original Message ----- 
  From: QSHIPQ at aol.com 
  To: dag.boesterud at consulgranada.net ; David.Coleman at blackrock.com 
  Cc: V8 at audifans.com 
  Sent: Friday, July 20, 2007 3:17 AM
  Subject: Re: [V8] [unclassified] Re: 1992 Audi V8 4.2 running lean


  Ck the vacuum hoses and the MAF sensor.  Vacuum hoses are cheaper, but if you are at ingo's house, you just open a nearby v8 hood and swap the MAF sensor with known good.  Do diagnostics on the WOT switch too, and don't forget to ck for codes.  The crossover rubber pipe between the valve covers can cause a lot of problems, as can the short hose at the back of the DS head that feeds the PCV pipe going forward.

  HTH

  Scott J


  In a message dated 7/19/2007 8:08:54 P.M. Central Daylight Time, dag.boesterud at consulgranada.net writes:
    Well.. okay :)

    What I don't understand, is that if I disconnect the oxygen sensor the car 
    is fine. Hook it back up,
    the car leans out.... but the oxygen sensor is new, and I changed it just 
    because of this error..

    The car seems fine over roughly 3500-4000 rpm, the problem with lean running 
    seems to be up to 3500-4000.

    /Dag






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