CPS issue...maybe

Ed Kellock ekellock at gmail.com
Wed Apr 11 17:49:05 EDT 2007

Red hot exhaust manifold makes me thinking of a plugged cat.  Power
fluctuations could have been somewhat realistically relevant to
sensing of temperature problems.

The things that cut the power should have prevented a glowing red cat
in my mind so I'm looking at this from the opposite end, so to speak.


On 4/11/07, Sean Coriaty <sean.coriaty at gmail.com> wrote:
> Obtained my second 200q20v avant last month; 207k miles, paid 4k. Pearl on
> black sport, nice shape cosmetically.
> Screaming clutch TO bearing held up during the 1k mile drive to NH from MI.
> Week or two after short commuting, seemed to be running rich (20 MPG,
> occasional fuel smell).
> Changed oil, hit the highway, WOT from the toll booth then sudden loss of
> power.
> Kept running under very low power for several seconds. Tried giving it more
> gas with little effect; noticed boost readout was erratic- eg, 1.6 then 0.4then
> 1.7 then 0.2 all within a second or two. Pulled over, it stalled. Would turn
> over but no start. Popped hood, noticed exhaust manifold was glowing red
> hot...in daylight.
> Been suspecting turbo was burning oil, since I'd notice oil smoke coming
> from that side of hood after WOT runs and it was making a max of 1.6 bar
> boost and turbine louder than last 200q20v.
> No Audi specialists within reasonable tow range, so it went to the stealer
> (I know, I know)
> Stealer said they "pulled tons of codes", then said they spent 2 hours
> trying to diagnose no-start but couldn't.
> Administered mild verbal abuse to tech rep.
> Next day, they claimed the crankshaft position sensor isn't putting out a
> signal and asked me to authorize $500 to replace it.
> Asked them if they're SURE the CPS is responsible for no-start condition;
> they said yes. Have my doubts, but time will tell...
> CPS due to be installed tomorrow.
> If CPS is truly bad, would it have resulted in the red-hot exhaust manifold?
> Wondering if anyone has any input.
> Sean
> 1991 200tq20v Avant 209k
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