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rpm surging at idle 1800 1973

posted by  someone claiming to be volvomex on  Tue Jun 11 13:40 CST 2002 [RELATED]

Hi,

the RPMs at idle surge from about 800 to 1600.any ideas

Appreciate all answers,

Thank you








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rpm surging at idle 1800 1973

uid 779's pic
posted by  matt b on  Thu Jun 13 02:27 CST 2002
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last visit: Tue Oct 14 16:33 CST 2014
[RELATED]

I'm with the vaccuum leak idea. I had a 142e that did the exact same thing.. But the behavior would change depending on whether my foot was pressing teh brake or not... I never did fix it (destined to be a parts car), but I simply assumed that I had a bad brake booster.

Check and see if it changes with application of the brakes....

-Matt








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rpm surging at idle 1800 1973

posted by  someone claiming to be Dave B on  Wed Jun 12 07:04 CST 2002 [RELATED]

More than likely this a faulty Auxilliary Air Valve.








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rpm surging at idle 1800 1973

uid 4846's pic
posted by  JohnMc on  Wed Jun 12 03:11 CST 2002
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last visit: Thu Oct 23 07:42 CST 2014
[RELATED]

Its still fuel injected, right?

First of all, double check the timing and set the valves. You don't want to fuss with the FI system to work around other problems.

Then check for vacuum leaks - although these usually just lead to a continuously fast idle you can't adjust down with the idle valve. A long rubber hose can work well as a stethoscope.

Failing finding a leak, do some basic trouble shooting on the FI system:
http://www.icbm.org/erkson/ttt/engine/fuel_injection/d-jet.html







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