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1994 Mazda B2300 Sputtering

Tiny
DONEVANS0306
  • MEMBER
  • 1994 MAZDA B2300
  • 2.3L
  • 4 CYL
  • RWD
  • MANUAL
  • 198,000 MILES
My truck will start, but after a while (while parked) the idle will start going from just about to sputter out to around 3000 rpms and keep fluctuating in between. When I'm driving and in gear the rpms will maintain around 3000 rpms with out even hitting the gas and in neutral until I come to a complete stop. What is my problem?
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Friday, August 28th, 2015 AT 2:09 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
First eliminate all vacuum or air leaks in the system (very important)

. 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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Friday, August 28th, 2015 AT 4:35 PM

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