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Update on intermittent idle trouble shooting 900 1993

posted by  Big Harry on  Thu Jan 25 10:57 CST 2007
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last visit: Sun Sep 21 11:06 CST 2014
[RELATED]

Well, it is time to post something else on the intermittent idle problems after warm up that has been plaguing my 944. If you followed the previous posts, you read that I have checked and changed every sensor, checked fuel rail pressure and bleed down, cleaned the throttle body and idle control solenoid and re-adjusted the linkage per the factory specs. I also replaced the fuel injectors and added more grounding in the system plus cleaned and checked the power stage in the top of the coil. My OBDs are always 1-1-1

A couple of weeks ago there was a post from a fellow with a 940 that was eating O2 sensors. His symptoms were identical to mine even though I haven't had any codes that would indicate a problem, so I ordered a new O2 sensor from sparkplugs.com for $108.00 with shipping(Thanks Bruce!)confident that the problem would be solved. A short drive around the block shot that down; as soon as the temperature was in the operating range the car started bucking in drive while standing still and it felt like it was fouling in one or two cylinders. The problem goes away above 2000 rpm but returns as soon as I pull up to a light for a couple of seconds. I am open to suggestions (except 'have you checked your RSR?' kind of things). It may be that changing back to a Bosch system will be the fasted fix.

Regards,

--
Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles






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