Question about 1999 Mazda 626
Hey gang, I have a 99 Mazda 626, 4 cyl, and have an annoying issue I am dealing with. When the car is in drive, L2, L3, or reverse, but not moving, the idle is rough. Not to the point of choking out, but rough nonetheless. When I put the car in neutral and park, it's smooth as a baby's bottom, and so quiet you don't even know the car is running. Someone told me it might be the mass air flow sensor, but it's when the car is not in motion - does that sound right?
(I've already done a tune up, changed plugs and wires as well)
Hmmm have you had the timing belt changed? is it due for one? that can cause a some rough idling.
Posted on Apr 27, 2010
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Posted on Jan 02, 2017
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Feb 17, 2015 | 1999 Oldsmobile Alero
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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