06 Mazda MPV

2006 MAZDA MPV
6 CYL • FWD • AUTOMATIC
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BENJSTOP
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  • 3 POSTS
Recently heard sound in engine (??) as if it is idling high and then low. Only 55,000 miles on it. Most notably loud when idling. No oil lights. All fluids good. But the sound goes or revs up and then revs down.
Nov 27, 2010 at 4:10 PM
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GMTECH
  • ✓ASE Certified Mechanic
  • 537 POSTS
  • ASE Certified Mechanic
I am not sure as I can't hear the noise. Do you have an exhaust leak in the front pipe. If it has a pinhole leak it may sound that way
Nov 27, 2010 at 4:23 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
First check for any possible vacuum leaks as this can cause that symptom.

If none, 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.
Nov 27, 2010 at 4:27 PM
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