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During idle slight up/down in RPM 700

posted by  DPNY on  Tue Mar 25 20:01 CST 2014
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last visit: Thu Sep 18 18:45 CST 2014
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Car running well. Volvo 740 manual trans. Turbo.

But during idle slight up/down of RPM. Idles a about 800 RPM but goes up and down about 50-100 RPM in a 2-3 second cycle.

Any ideas?

Dean








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During idle slight up/down in RPM 700

posted by  aleekat on  Wed Mar 26 08:22 CST 2014
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last visit: Fri Oct 24 13:19 CST 2014
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Lots of variables:
Plugs, wires, cap, rotor, TPS adjusted properly. Throttle body clean. ICV clean. Air cleaner. Air leaks,,,etc,,etc

Year??
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During idle slight up/down in RPM 700

posted by  DPNY on  Wed Mar 26 10:23 CST 2014
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1990 - Plugs, wires, cap, rotor, air cleaner probably OK.

TPS ICV - I don't know much about it. Can I simply replace them or is adjustment always required even with a new part?

Air leaks - could be.

Dean








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During idle slight up/down in RPM 700

posted by  aleekat on  Wed Mar 26 10:47 CST 2014
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Throwing parts at it is no guarantee it will fix your problem. FAQs covers all these items. Not sure what you mean by "probably okay". When was the last tune up?
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During idle slight up/down in RPM 700

posted by  DPNY on  Wed Mar 26 13:36 CST 2014
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last visit: Thu Sep 18 18:45 CST 2014
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Thanks I will look through the FAQ on these topics.








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During idle slight up/down in RPM 700

uid 49372's pic
posted by  740_dan on  Wed Mar 26 13:47 CST 2014
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last visit: Thu Aug 28 13:10 CST 2014
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Look at this page, much easier to find info: http://www.brickboard.com/FAQ/700-900/FAQIndexNew1.htm
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During idle slight up/down in RPM 700

posted by  DPNY on  Wed Mar 26 19:30 CST 2014
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last visit: Thu Sep 18 18:45 CST 2014
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Thanks I found the idle info. Very helpful.







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