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Idle Surging

Old 05-15-2018, 08:34 PM
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Staging Lane
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abybody know why my idle would surge from 800 to 2000 after the car is warmed up. Happens in gear and in neutral while driving and at stop lights. Could a bad air pump cause this? Check engine light just came back on after air check valve replaced. Car is stock 1998 z28 150,00 miles
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Old 05-15-2018, 08:42 PM
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Vacuum leak somewhere.

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Old 05-15-2018, 10:00 PM
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Also check the IAC valve, might need cleaning
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Old 05-16-2018, 08:30 AM
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Thank you guys. Recently replaced one of the valves and got a pending code for the air pump. Would the vacuum leak be from the intake manifold or from the pcv lines?
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Old 05-16-2018, 09:15 PM
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Vacuum leak could be from anywhere. Exactly what valve did you replace and which brand is it?
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Old 05-17-2018, 09:18 AM
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Originally Posted by jaxcam02 View Post
Vacuum leak could be from anywhere. Exactly what valve did you replace and which brand is it?
AIR check valve bank 1 and AC Delco
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