WHY IS MY CAR IDLING SO ROUGH? I RECENTLY HAD ...

  • Tiny
  • rlbutta16
  • 1994 Mazda Protege
  • 115,000 miles

Why is my car idling so rough? I recently had my rear O2 sensor and the wires replaced. This fixed the problem I was having with the engine and check engine light that had been on. Now my car idles very rough at around 700 rpms. It used to idle a bit rough once at Normal Operating Temperature. Now its every time that I'm idling. It hasn't stalled or seem to come close to stalling, but I'm concerned that this may lead to another problem over time.

What should I check first? I read some forums and I kept seeing "check the IAC valve", but I don't to look for, or what to get to clean it. I know where my IAC is though. I had bought the car from a friend and don't know everything that has been done to it. I'm going to get an oil change this weekend, hopefully that will help. It couldn't hurt as I see it.

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Friday, December 7th, 2012 AT 9:57 PM

3 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

The idling speed seems to be too low. Try cleaning the throttle body and IAC.

http://www.youtube.com/watch?v=EzgX5t0qR-8

The above link should be helpful.

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Friday, December 7th, 2012 AT 10:24 PM
  • Tiny
  • rlbutta16
  • Member

Thanks so much! You guys provide such an excellent resource of knowledge here!

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Friday, December 7th, 2012 AT 10:52 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

You're welcome.

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Saturday, December 8th, 2012 AT 6:31 PM

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