ignition/ poor running problems

[JShadzi at aol.com]

Yes, anytime a temp sensor signal is cut from an ecu its ability to properly control the fuel mixture is completely compromised.  In Paul's case it could be an air-temp sensor too, which will give similar results.  It could be a bunch of things, but that is the first place I'd look, especially considering the check is so easy to do, and is quite common amoung all Audi's IME.

Javad

> Paul Royal was having similar trouble with his 90q20v at the winter
> driving school this weekend.
>
> He accidentally tried to start it in gear, and from then on, it wouldn't start.
>
> They cleaned the plugs(which were totally fouled) up with
> alcohol+toothbrush, put them back in, it ran better for a minute or
> two and then started backfiring etc again.
>
> He'd had similar problems several years ago at the last WDS, and
> simply turning the car off+back on fixed it.  The same happened
> yesterday, and he drove the 30 min to Tim's school with no problems,
> did a timed lap around the course, and shortly thereafter, it started
> acting up again.  Backfiring, blowing black smoke...exhaust smelled
> super rich.  Stopped it, started it up again, no rich running.  Odd.
>
> I just forwarded him a copy of the below, but Javad, do you think
> similar symptoms would occur on a 90q20v?
>
>
> B
>
> At 11:37 AM -0500 2/4/02, JShadzi at aol.com wrote:
> >This sounds like a classic case of either an intermittent water temp
> >sensor or water temp sensor connector.  Try pushing up on the
> >connector when this happens, or inspect the connector, usually what
> >happens is one of the pins falls back in the connector and makes a
> >poor contact.
> >
> >HTH,
> >Javad
> >
> >>  I have been troubleshooting an intermittent poor
> >>  running condition where the engine suddenly looses
> >>  power and runs as if the timing
> >>  is off, sputtering and possibly backfiring through the
> >>  intake ( a loud popping noise of the air flow sensor
> >>  plate in the intake is heard
> >>  when throttle is applied at time of poor running).
> >>
> >>  This condition happens spontaneously and vanishes
> >>  within a few seconds only to return again a few
> >>  minutes or hours later of driving
> >>  when running at 3-4k operation revs.
> >>  Engine is prone to this condition more so at idle.
>
>
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