When accelerating from a stop car surges

Tiny
JWM571
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • V6
  • 150,000 MILES
Engine idles up when put in gear and take off just like put on cruise control. Intake air flow?
Tuesday, November 2nd, 2021 AT 7:50 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

This sounds like the idle air control valve is sticking causing the engine to surge forward.

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works

I attached the procedure for you to follow below and pictures of the valve on the throttle body.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Roy

Important: The powertrain control module (PCM) will reset the IAC valve whenever the ignition is turned On, then Off. Turn the ignition on for 10 seconds, then Off for 5 seconds.
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Wednesday, November 3rd, 2021 AT 5:02 AM

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