Rough Idle

Tiny
PAUL323
  • MEMBER
  • 2006 BMW 330
  • 91,500 MILES
My SES light came on and my car started idling rough. It is giving me a P1415 code which says it is a secondary air system in bank one. My car does not have a secondary air system. I checked for leaks in the manifold, sprayed some carb cleaner around the intake manifold to see if there was a intake leak, no change. I disconnected each coil pack while it was running and the car ran worse, I changed the plugs and still get a rough idle when stopped at a light. My o2 sensors seem to be putting out around the same voltage, the fuel trim numbers are higher than normal,
-28% on the STFT and +26% on the LTFT. Could it still be the o2 sensor on bank 1 or is it a software problem.
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Monday, August 29th, 2011 AT 12:38 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
I have seen this problem before and it is caused by the MAF and a dirty throttle bore. Here are toe guides and diagrams below to show you how to fix the problem.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

and

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

Please run down these guides and report back

Cheers
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Wednesday, August 31st, 2011 AT 1:27 AM
Tiny
PAUL323
  • MEMBER
I did what you said and cleared the codes the throttle bore was filthy the engine has never run so good. No check engine light yet I will let you know if I have more troubles, thanks again :)
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Saturday, September 10th, 2011 AT 7:18 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
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Saturday, September 10th, 2011 AT 7:23 PM

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