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Thread Title:

cold idle speed too high


Created On Wednesday June 06, 2018 06:00 Diesel Talk
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egantrucking
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Note Wednesday June 06, 2018 06:00 View thread in raw text format
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My truck now needs to fully warm up before the idle speed to come down properly. Something has changed. Any suggestions?

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michael egan
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egantrucking
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Joined: Dec 2007

Note Wednesday June 06, 2018 07:31 View thread in raw text format
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I recently had the intake manifold off to install a gear case bracket. I'm wondering if the air temperature sensor is bad. Or would it need to be re-calibrated if it is unplugged?

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michael egan
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egantrucking
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Note Wednesday June 06, 2018 11:14 View thread in raw text format
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I'm thinking oil temperature sensor. Maybe I knocked it when working with the intake manifold. I'll check it when it cools down. Hard to see in this Volvo without taking the doghouse off.

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michael egan
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egantrucking
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Note Saturday June 09, 2018 10:06 View thread in raw text format
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It was the oil temperature sensor. I could not find any bad wiring so I bought a new oil temperature sensor($50 from Detroit) and tested the resistance with an ohm meter. It was significantly different than the old sensor. I also tested it against the fuel temperature sensor since it is the same part number and that also confirmed that the old oil temperature sensor was bad. I replaced the sensor and now the idle comes down properly when the engine is warmed-up. Looks like it is fixed.

The oil temperature sensor is located on the back(drivers side) left hand side of the engine bellow the intake manifold. The block is cast with the word "OIL" next to the sensor hole.

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michael egan
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