Engine Hunt at Idel

[aussieboxy]

I gave a 2000 2.7 that hunts at idle. What I mean by that is that the idle speed will drop to about 400rpm and the jump up to about 1500 rpm. It does this constantly. It's not quite as bad one you put the aircon on but it's still annoying.

Any idea's on how I can fix this problem.

Thanks guys.

[insite]

clean the idle air control valve

[aussieboxy]

Thanks and how do I do that?

[insite]

it's bolted to the driver's side of the throttle body. remove it (2 screws) and clean it out with carb cleaner. make sure the flap operates easily. re-install it.

while you're there, remove the intake hose from the throttle and look in it for oil. if you see oil, you probably need a new oil separator; this causes a vacuum leak that can cause your unstable idle.

also check for other vacuum leaks while you're in there. do this with propane or carb cleaner. wave / spray it around and see if the RPM's jump. if they do, you have a vacuum leak in that area. any of these can cause your issue without throwing a check engine light.

[aussieboxy]

Thanks I'll try that

[blinkwatt]

Originally Posted by aussieboxy

Thanks I'll try that

If that doesn't work you may want to smoke test the intake for leaks.