Originally Posted by SlackJaw

Well, I was driving this morning into the city, and after about 20 mins circling around for a parking spot, my jeep stalled out on me...at first, thought it was something either fuel or spark related...so double checked my spark plug wires and the wires on the cap and they were all on there properly. I kept trying to crank the motor and it would crank, but wouldn't start.

So after waiting about 20-25 mins, I gave it another shot and the Jeep started right up. Everything seemed normal, all the gauges were okay, no check engine lights and it was idling rock steady...so I continue to look for a parking spot and about about another 15-20 mins (yes, parking in the city on a Sunday morning can be difficult before a race - NYRR race - running) the Jeep stalls out again. By this time, the race start has passed so I said eff it...just going to head back home because I was more worried about getting home than anything else, plus I didn't really want to call a tow truck.

So I figure if I wait another 15-20 mins it would start up again, and surely it did. Drove about 45 mins on the highway with no hiccups and made it home with no stalling issues either.

So basically I think it's the IAC valve...should I replace it with a new one or just clean it and it'll be just as good? If it's not the IAC valve, where else should I look?

Thanks.

/rant

Originally Posted by Cherryokee

When does it stall? Does it occur only when when you lift off the pedal?

Your description leads me to believe that your throttle-body (and IAC, etc.) just needs a good cleaning...

Originally Posted by SlackJaw

only thing that kinda gets me wondering is why the 15-20 mins before it starts up again just fine? what would cause it to do that?

I'm about to head over to my local parts store to pick up some 2 cans of carb/throttle body cleaner.

Originally Posted by Cherryokee

I can be wrong but think it's a small flood just before the off-idle stall-out and it's wetting the plugs. Waiting 15 or so allows the plugs to dry off.

Is there a "sticky" feeling to the pedal when coming off-idle? Do you "feather" the throttle when you restart or keep you foot off the pedal entirely? Try "feathering" if you have not done so already.

Borrow the code scanner while at the store and read/record/clear any codes you find.

If you end-up needing an IAC or TPS then buy OEM parts. They may be more expensive but you get what you pay for (hard lessons learned).

Originally Posted by tjwalker

The next time this happens, VERIFY if you have spark.

Pull a plug, keep it attached to the plug wire, place the plug electrode near a good ground, have somebody else crank the engine while you watch.

Knowing if you have spark or not will help narrow this down a lot.

And if you don't have spark, but 15-20 minutes later you do, that means you have a component that is suffering from "thermal" or heat related failure.

The #1 cause of heat failure is the crank sensor. The #2 cause is the ignition coil.

Originally Posted by 90XJNSD

How old is that IAC? I would replace that or the minimum give it a good cleaning.

Originally Posted by Cherryokee

Man, that looked nasty in there. That was some gummy crud, huh? I hope you didn't push/pull on the IAC's pintle too much because that would break it (even though it might already be bad - don't worry, you'll know soon enough). Anyway, nice job cleaning up the TB, etc. It looks good now!