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Why does the engine surge after revving?

It revs up to 800rpm then drops to 450rpm for about 10 - 13seconds then idles normal

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  • Cars & Trucks Master
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That is about the norm for a cold start .life must start someplace and get the alternator running it used to be called fast idle

Posted on Apr 28, 2015

  • Eugene Barends
    Eugene Barends Apr 28, 2015

    Hi Ray,even when the engine is at normal operating temp. still the same.some days it doesn't happen at all

  • ray gallant Apr 28, 2015

    yep computer controls do it and we have no options but to live with it .

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The idling may be a loose connection to the "idle air control valve". if the control valve connection is secure, then it could also be a bad Throttle Positioning Sensor (TPS). To test the TPS, tap it with a screwdriver while the engine is self-revving, and see if the reving changes when tapped. if its not the TPS, then try cleaning the throttle body.

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High revs and surges when driving.


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