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Rough idling and vibrations in my car at lower RPMs?

Tiny
BOBBY_BLACQ
  • MEMBER
  • 2004 BMW 330CI
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 121,607 MILES
Hello, I am experiencing rough idling and vibrations in my car at lower rpms. I changed out some coils, checked for leaks (found none), and still no good. I used a scanner and it's throwing no fault codes, I'm having a mechanic check my ICV to see if it's failing. Can anyone point me to other things that could cause this problem? Thanks
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Tuesday, May 2nd, 2023 AT 1:58 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

When you say you checked for leaks, did you use something like carb cleaner to help? See link.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, I'm not sure if you tried, but oftentimes cleaning the throttle body bore will help this type of issue.

https://www.2carpros.com/articles/throttle-actuator-service

Also, there is an idle speed control valve under the intake that may be causing issues. I attached a pic of it below. However, this will usually set a code.

Let me know as much as you can.

Take care,

Joe

See pic below.
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Tuesday, May 2nd, 2023 AT 7:49 PM

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