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240 rough idle 200 1985

posted by  scorch on  Sat Jan 1 05:51 CST 2005
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You'll want to buy a Bentley manual.

If you unplug the air mass meter and it improves the situation, that's a good quick diagnosis that points towards getting a new one. There is a diagnostic for the AMM that you can do with a voltmeter but I don't know it off the top of my head. It's in the Bentley.

Another common rough idle culprit is a dirty throttle body. If you're not sure that it's the AMM and want to try other, cheaper things first, clean the throttle body. All you'll need for that is a new throttle body gasket, some carb cleaner, a clean rag, and maybe some pipe cleaners.

If it ends up being a bad air mass meter shortly after having had it replaced, you'll want to check into the air intake flapper valve that lives in your air filter housing. Unfortunately the failure mode has that valve all the way on hot, which will fry a new air mass meter pretty quickly.






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