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It's not a vacuum leak! CIS-Motronic Help

    I ran the carb cleaner check with all the vacuum line junctions and
lines today.  Nothing seems to be leaking.  I removed the injector covers
and sprayed the seals with carb cleaner, nothing.  I also am noticing that
the wooshing noise might be from the front end then echoing off the
firewall.  The wooshing noise is from the hydraulic pump.  The vacuum seem
to be OK.
    Now it's time to figure out what is wrong.  No codes, new ISV and air
flow meter, stumbling idle, constantly changing mixture setting, almost
stalls on stop, but occasionally idles just fine and runs fine.  Swapped
ECU's same thing, swapped ISV with another off a junker and the junker ISV
didn't work on my engine, no vacuum leaks, injector seals are not leaking,
what could be the problem!  I used to get air flow potentiometer code
everyday for two weeks then it stopped a week ago.  Everytime I got the code
the idle would not stabalize until I restarted the car.  Maybe ISV duty
cycle is not right, maybe potentiometer is out of adjustment?  Anyone out
there know what to do?


Alexander van Gerbig
'88 Audi 80 -- Koni Yellows, G&M Springs, Borbet Type T, Dunlop SP9000
HÖR Technologies Sport Hydro Cam, K&N Filter

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