Help needed from CIS experts

Erik Addy erikaddy at
Thu Dec 12 10:39:47 EST 2002

Hi guys,
long time no email, been busy getting married, etc.

Anyway, my '89 200tq with MC-2 (MAC14, K24, etc) motor
is giving me some troubles.  Car has TAP chip since I
bought it (I know, I know, if I did it, I would have
gone to SJM or Ned).  However, I don't think it is
related, as it didn't have these poblems before.

There are three symptoms I am experencing.
Please keep in mine the may all be caused by one
problem, or there may be more than one issue.

1)  Cold starts.
When started in cold ambient temps, the car will fire
right away, and immedietly die.  After doing this
about 3 time, you can keep it running with some
throttle, and then after a say 10 seconds of throttle
to keep the idle up, it will maintain idle on it's
own.  However, when you try to drive away, it will
quit unless you are VERY carefull with
It also bucks a little until it warms up.

2)  Hot starts.  If I drive it and then park for
10min-4 hours, it will crank but not start.  After
LOTS of cranking, it will eventually start and "clear
out" with some throttle.

3)  Surging.  Sometimes while driving I notice the car
is "surging" a bit.  Feels kind of like a bad injector
on a 20v motor, only probably a bit more noticable.
The other day when it was doing this, I looked at my
autometer boost gauge and noticed the manifold
pressure cycling up and down about 2" at a shot.  Huh?
 What could do that?  ISV?  But that shouldn't be
doing anything at 3000rpm.

So, I don't know.  I swaped in a different warm-up
regulator, with no change.  Fuel filter is relatively
new (no change).  Ohmed out the ecu coolant temp
sensor up front, looked OK but if I recall bently
shows a REALLY wide spec for this.

Any ideas?  I got to think this is fuel related (bad


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