Got a 2000 2.5L 4cyl Jeep Wrangler without any fault codes. No cylinder dropout or miss, Sometimes it will idle just fine and sometimes it will start (cold or warm engine) and just stall out unless you hold the throttle open some. Same thing driving it coming to a stop it will not idle and stall , and it doesn't matter if slipped into neutral to rule out a sticking TCC. Fuel Trims look normal, TP voltage ok ,Cam Crank Synch , IAT, ECT, O2 switching all look normal. The IAC valve is a $69.99 gamble. It don't have MAF sensor or any obvious vacuum leaks . Should I just slam a new IAC valve and see if the problem is fixed before proceeding to $69.99 of Scope analysis? I've been kinda looking for a reason to take the dusty cover off the counselor 2 and have a reason to run a vehicle with the garage door closed awhile. Anyone got any suggestions?
Jiminy Chrysler
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I'm pretty sure that IAC is the old stepper motor style. If you unplug it, it will just stay fixed in that position. On a cold start, unplug it so it idles a little high. Go for a ride. If it quits stalling, then you know you have some kind of air volume problem (or a purge valve sticking open). If it keeps stalling, you can save yourself $65.00 by not replacing it.
Joe"You don't build a reputation on what you're going to do"
Henry Ford -
I'm pretty sure that IAC is the old stepper motor style. If you unplug it, it will just stay fixed in that position. On a cold start, unplug it so it idles a little high. Go for a ride. If it quits stalling, then you know you have some kind of air volume problem (or a purge valve sticking open). If it keeps stalling, you can save yourself $65.00 by not replacing it.
JoeComment
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How dirty is the throttle body? Many idle related problems due to poor air flow around the small blade opening.
Been cleaning TBs with a hand held baking soda blaster off the Matco truck for couple years now with absolutely positive results.
Replace fewer DBW TBs too.Comment
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How dirty is the throttle body? Many idle related problems due to poor air flow around the small blade opening.
Been cleaning TBs with a hand held baking soda blaster off the Matco truck for couple years now with absolutely positive results.
Replace fewer DBW TBs too.Comment
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It's fixed , cleaned the throttle body and replaced the 185K IAC valve which indeed was of a stepper motor design. Snugged down all the loose rocker cover bolts on the greasy leaking valve cover. The cute young gal that owns and loves this old rough riding, noisey tire , exhaust leaking POS, is most likely going to be the one wearing the pants in the familyComment
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I've been doing the toothbrush thing since the middle 80's, using GM CLEENS spray. It cuts right through ANY varnish build up and is designed to be burned in the cylinders.
I agree with you Steve. Sometimes the simplest of things works the best, regardless of how convoluted the manufacturers try to make the vehicle.Comment
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You guys should give the baking soda blaster a try, I gave up the teeth brush method cold turkey.
I rebuild a lot of ATV/MC carbs and nothing cleans them like baking soda.
Blaster was around $50? if I remember, and baking soda is dirt cheap.Comment
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