Question about 1994 Cadillac DeVille

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Service engine soon comes on and stays on, idles too fast and fast idle solenoid makes noise after turning car off

No readings when checked at part store

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Check the engine computer again for trouble codes, you may find the idle speed solenoid has failed, there is a vac leak, or the throttle plate is sticking open.
You should be able to check a 94 model yourself using the ac control panel on the dash.
The procedure and code list is available online.

Posted on Mar 27, 2015

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