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06 Mazda MPV

Tiny
BENJSTOP
  • MEMBER
  • 2006 MAZDA MPV
  • 6 CYL
  • FWD
  • AUTOMATIC
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.
Saturday, November 27th, 2010 AT 4:10 PM

2 Replies

Tiny
GMTECH
  • MECHANIC
  • 537 POSTS
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
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Saturday, November 27th, 2010 AT 4:23 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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.
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Saturday, November 27th, 2010 AT 4:27 PM

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