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I've cleaned and cleaned my IAC on the 1991 740 with the Regina system. It seams to make a big difference in my idle, but it only lasts for a week or so. It seems like maybe it's sticking and the cleaning only lasts for a short time.
I'd like to borrow (or rent if I have to) a known good IAC for the regina system. They retail for over $200 and I'd hate to buy one if it doesn't fix my problem. If I can get one for a while, and the idle smooths out, then I'll pony up the cash and buy a new one.
I've followed every suggestion in the FAQs on rough idle, but it just keeps coming back. The only things I haven't yet "fixed" or replaced are the IAC and the computer.
None of the local junkyards has any Volvo's that haven't been gutted.
TPL
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1991 740 B230F 135K miles
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