will idle up and down only when starting the vehicle?

2005 DODGE DURANGO
85,000 MILES • V8 • 4WD • AUTOMATIC
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MSJS09
  • MEMBER
  • 1 POST
My vehicle will idle up and down only when starting the vehicle. I had a tune up done on it at about 70000 miles so I am not sure why this is happening.
Jul 2, 2009 at 4:11 PM
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SQM
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 6,383 POSTS
Hello,

It sounds like an issue with the throttle actuator.
The vehicle is designed to have higher idle for a split second to ensure proper startup. But it goes down right away after a successful start.
If the throttle actuator is faulty it can keep the idle at a higher speed for longer and can make the idle higher.

Many times with an issue with the actuator the check engine light gets triggered.
Is your check engine light illuminated?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there is trouble codes it can help with the diagnostics.

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
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Sep 21, 2021 at 2:32 PM
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