Why is the engine idle dropping and raising?

Tiny
DCMEZA
  • MEMBER
  • 1998 VOLVO V70
After changing the timing belt the cars surges high and low and now sometimes stalls when the idle drops too low
Friday, July 13th, 2012 AT 3:53 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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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Friday, July 13th, 2012 AT 4:08 PM

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