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Idle varies (a lot) when car is cold. Ok when hot. Suggestions? 200 1987

posted by  Mr. Tool on  Sat Sep 14 02:37 CST 2002
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last visit: Mon Sep 1 17:19 CST 2014
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Hi: Have a 1987 240 Wagon, Auto Trans, B230F engine. 176,000 miles.

This all started about 1 week ago.

In the morning when the car is started the idle fluctuates alot. By hundreds of rpm

When car warms up it seems to be ok. All duct work and vacumn hoses are in good shape.

Have a new air filter, also new fuel pump relay and new fuel filter. New coolent temp. sensor, also.

I swapped Air Mass Meters (AMM) from my other 1987 240. No change.

These symptoms appear when the car sits overnight and the ambient temp. is below 70 degrees F.

QUESTION:<\s>

1. I'm thinking possibility of a bad Fuel Pressure Regulator?

2. Maybe a bad coolant temp. sensor (even though the new one is 1 month old).

I don't believe it's a dirty throttle body

Any help or ideas would be appreciated. Thanks

--
Mr. Tool








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Idle varies (a lot) when car is cold. Ok when hot. Suggestions? 200 1987

posted by  Aye Roll on  Sat Sep 14 16:55 CST 2002
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last visit: Tue Oct 14 21:08 CST 2014
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As long as the big plastic air hose from AMM to intake is ok, I'd suggest swapping out the idle motor or at the very least pulling off the hoses to check for built up carbon, oily gunk, etc. They're never clean when I work on them.
And the fuel pressure is definitely something to check, and fairly easy.

After that... (cringe) wiring harness??
Good Luck
Rob Bareiss








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Idle varies (a lot) when car is cold. Ok when hot. Suggestions? 200 1987

posted by  smithy on  Mon Sep 16 05:52 CST 2002
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last visit: Thu Aug 23 05:49 CST 2001
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Got the same problem with my '88. Is it wise to get a new idle motor or are junk yards a smart source?
-Smitty '65 122s & '88 244







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