When accelerating from a stop car surges

2003 CHEVROLET IMPALA
150,000 MILES • V6
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JWM571
  • MEMBER
  • 1 POST
Engine idles up when put in gear and take off just like put on cruise control. intake air flow?
Nov 2, 2021 at 7:50 PM
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ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 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.
Nov 3, 2021 at 5:02 AM