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RPM increase/decrease

Tiny
34RJC
  • MEMBER
  • 2005 TOYOTA COROLLA
  • 44,500 MILES
When I am stop for a red light, transmission on auto, AC on. The rpm's drops and car vibrates, and then rpm's goes where it suppose to be. Thanks, Rudy
Tuesday, April 24th, 2018 AT 1:16 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
The idle air control valve may be acting up. It is located on the throttle body, you can try and clean the valve passage with a throttle body cleaner. You can also read the position steps with a live data scanner, you can watch the idle valve working. Also, look for any other problems as well, like a vacuum leak, ignition problem, faulty sparks or ignition leads. Any codes set, regarding engine management problems that need attention as well.
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Wednesday, April 25th, 2018 AT 12:46 AM

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