'89 200q power problems

Bernard Littau bernardl at acumenassociates.com
Mon Dec 9 08:45:19 EST 2002

Hi John,

I would start with the easy stuff.  These turbo cars have a tendency to have
leaks in the air tract.  Start by pulling off the Intercooler to Throttle
Body hose, also known as the Michelin Man hose around here.  Flex it and
inspect the bottom for slits.  An opening here will make your car run rich,
which will make it sputter and produce black smoke.  At higher air flow
levels, the slit becomes less of a factor as only so much air can be lost
through the opening.

A very good site for the turbo cars is Scott Mockry's:

The IC to TB hose is mentioned here:

Browse around Scott's site, and work through the checks and tests, and you
should be able to get it running well.


Bernard Littau
Woodinville, WA
'88 5ktq

> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Ben Swann
> Sent: Monday, December 09, 2002 7:14 AM
> To: 'janders1 at mix.wvu.edu'
> Cc: 'quattro at audifans.com'
> Subject: '89 200q power problems
> Could it be the timing belt is off a tooth or more?  I'd speculate that if
> it were too advanced then you are suffering from low RPM
> performance.  When
> you reach higher RPMs coupled with the boost, you have all power in upper
> RPM range where the torque/HP is skewed.
> I don't know if that explains the sputtering and smoke though.
> That may be
> Oxy. sensor.  Also the mutli-funtion thermo senders don't seem to last to
> long - that would cause problems like this too.
> [Hi, new to the list again after quite some years, had a few Quantum
> syncros and 4000q's years ago and used to follow.  Anyway a few quick
> questions I'd love suggestions on.  Picked up an '89 for an appealing sum
> and it is a fair car generally but it has a bit of a problem.
> Engine is replaced recently (timing belt snapped on PO) with an earlier
> 5ktq mill with about 95k on it (per reputable place) though compression
> falls out at 125, 120, 120, 120, 98 (though car has not been
> driven so that
> may improve if #5 was sitting open.  Problem is that in any gear from
> approx 0.4-0.8 bar boost (per the dash gage) at whatever revs appropriate
> to give said boost it sort of sputter/gags/misses miserably.  Not enough
> that it is anywhere near not driveable, but fairly cruddy.  The second you
> hit 0.8 bar it instantly pulls smoothly and very powerfully through about
> 1.3 bar until you let off the throttle/boost whereby it miserably repeats.
>  It feels more a fuel delivery miss in the seat of the pants, not
> ignition.
>  Once again per the digital gage at whatever pitiful sampling rate it has
> there are no sudden jumps in boost or anything.  While it is so sputtering
> apparently it dumps rich smoke out the back per follower.  Two other
> perhaps incidental, perhaps not, the cold start is very rough and it has a
> hard time running until it gets about 90 seconds under its belt. The car
> sat with little gas in the tank all summer and into the recently cold WV
> winter run no more than once a month.  The check  engine light is on and I
> will read the blink codes in the AM.
> Anyway, I have years of engineering and engine building VW/Audi wrenching
> experience, but I know nothing at all about turbo charged vehicles other
> than aircraft and Corvairs.  Any suggestions appreciated, I'm
> pretty crafty
> and will probably have most anything needed for diagnosis (excepting
> factory tools 8-)  This obtuse Bentley set for this car is not helping me
> any.  I do have a Snap-On CIS manifold gage test set.
> Any help appreciated, please email me direct so as not to waste bandwidth,
> thanks.
> John
> janders1 at mix.wvu.edu]

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