Why is my reving on its own when I turn steering.

  • 1991 MAZDA 626
  • 168,000 MILES

Why is my reving on its own when I turn steering and have got idling problem.

Saturday, November 10th, 2012 AT 1:46 PM

1 Reply

  • 20,939 POSTS

The IAC (idle air control) is trying to compensate for the loss in RPM caused by the power steering pump strain and it looks like it is overshooting the target RPM probably due to sludge buildup.

First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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Saturday, November 10th, 2012 AT 2:33 PM

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