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93 940 Turbo - rough idle

Just bought a 93 940 Turbo from an auction: 131k miles. The idle was cranked up to make it idle more smoothly. I cleaned the throttle body and adjusted the idle per:

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It still runs rough.

Could it be the idle switch? It has 3 contacts, when I test it with a continuity checker it makes and breaks between two of the poles. But there seems to be no action on any other combination of terminals.

Any other suggestions. Thinking of replacing the injectors but thats a few more $$$!

Thanks Berk Ott

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me
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Try cleaning the Idle Air Control Valve. This is likely to be the cause of the rough idle. We, on this side of the pond, follow the recommendation to thoroughly clean the complete inlet tract every two years. This tends to negate such problems.

Cheers, Peter.

Reply to
Peter Milnes

a fine auto...i got mine on eBay also...these leiile babys fly when set up right.. ;-) anyway... 1st make sure you have no leaking or cracked hoses...esp the large turbo hoses...this will %$#@ the running BIG TIME...check vacume hioses as well...(any craks, splits, etc.)..i am not sure how to check the electrical swtich...that is when i am visiting my volvo shop...i did learn how to read and dump the error codes...that was quick and easy...i agree to look at the throttle body...make sure that is workin'...then...there are a few electrical sensors to check and verify...you may want to unhook the battery and re set the computer...i know sometimes this will help my low idle...and poor low end , off the lice accrleration settings...anyway...good luck w/the940t.. with some $$ (2-3k) you can get these older volvos to 0 - -60 in

6 sec or < ...

Reply to
~^ beancounter ~^

I would suggest diagnosing injectors, locating any vacuum leaks from poor seals and O-rings. What about temp... sensors? 02 sensors? plugs and wires? Do you have a manual that explains diagnostic procedures? If no, recommend strongly that you invest in one. I have complete set of OEM manuals for my 245 and if I hadn't invested in them I would have been forced to unload my brick along time ago. Oh! what about the turbo, is it running properly?

Hope I have been a little helpful

Dan

1987 244 DL 189,000KLMS 1988 245 DL 242,000KLMS currently replacing squealing blower motors in both cars. Been doing it for 3 days now, removing the entire dashboard, steering wheel, and 2 front seats makes the job easier, and found small window leaks in one car and a broken defroster door actuators in the other. Plus removed hordes of debris which had to have been blocking out fresh air entry to the passenger compartment.

me wrote:

Reply to
Dan Harrington

Check the spark plugs and HT leads as well.

Keith Beast E14 4NS Docklands "Dan Harrington" news:KiEkb.93448$ snipped-for-privacy@twister01.bloor.is.net.cable.rogers.com ...

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Beast

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