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Idle issues on '92 740GL Regina (this is a puzzler)

posted by  dnarby on  Mon Jan 20 18:03 CST 2014
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last visit: Wed Jan 22 12:27 CST 2014
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Posting this to all the Volvo forums I can find, this is stumping everyone.

I have read all the FAQs.

Car is a '92 740GL w/Regina system

Sometimes it starts and idles fine for 15sec or so, then idles @ 2K RPM. sometimes it starts hard and wants to idle low. Sometimes when you plug the IAC in you can feel it opening and closing, and sometimes when you plug it in you don't feel anything (no power to the IAC?!).

Tried this with the original IAC and a Bosch which I jumpered (and hooked up to feed/vacuum hoses), saw the same behavior with both. So good news is, if you need to use a Bosch IAC on a Regina system, you can kluge it in if you have to.

Have run both IACs off a power supply to test them and they both operate flawlessly.

Have cleaned the TB and this http://forums.turbobricks.com/showthread.php?t=35053 (after the idle issues were noticed).

One thing, the IAC only seems to fail to operate when it's fully warmed up - so far.

Any input is greatly appreciated. TIA!

Dave






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