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240 Volvo high idle

Old 09-30-2018, 08:43 AM
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Join Date: Sep 2018
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Unhappy 240 Volvo high idle

My 1990 240 is idling real high. Unplugged aic and idle dropped below normal. No vacuum leaks no intake hose leaks between maf and throttle body. Cleaned throttle body. Car is a 5 speed.

Last edited by Myleeann77; 09-30-2018 at 08:54 AM.
Old 10-09-2018, 01:37 PM
Join Date: Jul 2018
Posts: 87

It could be your throttle body is worn out and leaking through the butterfly axle shaft, or the butterfly is misaligned in the throat. The engine can't idle high unless it's getting air. It's coming from somewhere, and it's going through the MAF. Could your throttle linkage be binding or out of adjustment?

I'm not sure which one is which, but some of the older cars had a simple idle adjustment screw. It didn't use a throttle regulator like newer cars.
Old 10-09-2018, 02:08 PM
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Join Date: Sep 2018
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Thanx .. it ended up being a bad mas air flow sensor previous owner bought a cheap one off internet and it lasted 4 months. I had just got car last month.
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