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high idle/Oxygen sensor question (85-245) 200 1985

posted by  B.C. on  Sat Jun 4 17:34 CST 2011
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last visit: Wed Mar 28 22:28 CST 2012
[RELATED]

High idle can be caused (allowed?) by the idle air control going out of whack. If it opens up, more air is allowed into the engine so it speeds up.

The IAC is controlled by the throttle position switch. When the throttle plate is almost closed the switch is tripped, and the IAC takes over the idle speed control. With the engine stopped, move the throttle plats and listen for the "click".

If you can catch the problem happening long enough to clamp down (pliers) on an air hose from the IAC, the idle should drop. There is a way to clean the IAC, look in the FAQ's. Clean it and if the problem isn't fixed, start checking the throttle position switch, and maybe it's wiring.

The main wiring harnesses in the 240's up to 1988 have an insulation rot problem, so check for that, too. find the gray connector mounted on the firewall as see if you can see the wires into it from the engine, look there for rot. Could be it has already been repaired.

Good Luck,

Bob

:>)






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