idle problem

Bernie Benz b.benz at
Tue Feb 25 15:42:52 EST 2003


I've not had the problem on the 200 with the Bosch rotary ISV, but it is a
very common problem on the 7A engine using the Hitachi linear ISV.  See the
20V archives and repair section.  The trick is to not force the ECU to
control idle speed from zero up, which causes hunting, instability of the
idle speed.  So, fix the minimum idle speed without ECU control to 700/750
RPM.  Do this, with engine hot, by unpluging the ISV and adjusting the TAB
(throttle air bypass) to the above RPM.


> From: Dave <morpheus0213 at>
> Date: Tue, 25 Feb 2003 10:04:16 -0800 (PST)
> To: 200q20v at
> Subject: idle problem
> I was wondering if anyone knew of a cause of irradic
> idle besides the ISV I did the output test and cleaned
> it thoroughly and I seem to still have a slightly
> erradic idle.  I also seem to be cutting fuel at
> around 1.6bar, the car will pull then all of a sudden
> quit on me and will buck at more than 1/4 throttle
> until I restart the car.  Every boost/vaccuum line has
> been replaced I have a new fuel pump and fuel pressure
> regulator, a new blow off valve, new fuel filter, new
> plugs, new rotor, and an empty wallet.
> Thanks,
> Dave Pianka
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