Question about 1989 Cadillac Seville

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1989 cadillac seville. when engine warms up, the idle rpm rises to 1700-1800 rpm. stays at high rpm even when put in gear. changed the idle control motor and adjusted according to the manual. no difference. is there a pressure or tempature sensor that is sending a bad signal to the computer?

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This is a kind of long procedure that involves the TPS sensor. If you want to fix it I can tell you how. You will have to go into the diagnostic center and get somen readouts. Reply I have a service manual and got mine idling correctly

Posted on May 09, 2010

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Posted on Jan 02, 2017

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E13-Oxygen sensor voltage stays between 0.307 and 0.609 volts for 64 seconds. Engine was at normal operating temperature at a speed over 800 RPM.
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