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Old 06-15-2010, 01:14 PM   #1
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couple of probs - hesitates, stalls

hey all, sorry 'bout being a newbie and just coming in and asking questions. searched around and have some direction, but have a couple of (probably dumb) questions. this is a 2000 tj, se with a stick we're talking about. has a KN air filter.

lately it's been hesitating when accelerating, right around the 2k rpm mark, so up around 2500-3000 before i shift, it's good, then when i shift, it's back to around 2k and lags until the rpms get up. seems to get better and worse, and seemed to do it less when the weather was cold and i was running the heater, i don't use the a/c, but my wife drove it a few times recently and used the a/c.

now my engine light came on and i've tried to do the 3 key turn on to get a code and it doesn't work. (i've done it on a dodge truck and it worked.) it will start but runs rough, revs rough and acts like it doesn't want to rev and then sputters and dies after revving.

from what i've read, sounds like i need to clean my idle air controller and throttle body. i can look up how to do that, but is that the best first step? what kind of cleaner to use? and really dumb maybe, but do i need to hose my engine off before opening up the air cleaner, throttle body and stuff?


also, this jeep has been driven as a daily driver, has about 130,000 miles on it, and hasn't had anything done to it besides regular oil changes. i cleaned the air filter and re-oiled it a while back, could anything have happened then?

what other kind of maintenance should i do while i'm messing with stuff? plugs, wires, distributor cap...?

also, my jeep has had a slow, on and off radiator leak, i've just added some coolant when it gets a little low, hasn't run hot. looking under the front, that's what this would have to be, right? and as long as it's not hot, it's not absolutely urgent, right?


thanks for any help you guys can give.

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Old 06-15-2010, 01:25 PM   #2
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keep a close eye on your coolent levels, you don't want to overheat it.

Change your spark plugs right away and check the wires for cracks in them.

when you say "lately" you mean like within a month? six months? or the last couple days? Bad gas will do that if there is any water in as well.

Gap the plugs at .035 (thirty five thousandths) double check them.


...and Welcome! You'll get a lot of feedback, some right, some wrong, all guesses from accross the net. Try what you can and get a pro to look at anything you feel is to much to deal with.

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Old 06-15-2010, 01:39 PM   #3
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remove the aircleaner, get some throttle body cleaner, spray it into the opening on the side by the throttle body until it runs smooth. YOu'll have to hand rev it with the throttle to keep from dying at first.
I just did this and It solved a similar problem
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Old 06-15-2010, 01:46 PM   #4
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Replace your spark plugs, clean the throttle body and IAC. If those do not fix the issue ... I bet it is your TPS (Throttle Position Sensor) that needs to be replaced.
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Old 06-15-2010, 01:48 PM   #5
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by lately, i mean, probably 6 months. geez, didn't mean to let so much time go by.
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Old 06-15-2010, 03:22 PM   #6
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is this what i'm supposed to be cleaning? i sprayed a little throttle body cleaner in there with it running, but didn't want to do too much. is there something i should be aiming at? when i open the throttle by hand, do i spray it right down in there?

do i need to try and wipe that black stuff off inside there? i noticed, one of the connections along the air intake was kinda messed up and could quite possibly have been sucking dirty air in for who knows how long!
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Old 06-16-2010, 04:00 PM   #7
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Throttle Body

Yes, spray it directly into to side where the opening is. I used the tube on the spray head to make sure I got it in there. I used about half a can
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Old 06-18-2010, 09:36 AM   #8
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thanks fellas. cleaned up the throttle body and took the iac off and cleaned it good. runs like a champ now. can't wait to see how it is after i do the tune up stuff this weekend. thanks again.
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Old 06-18-2010, 11:15 AM   #9
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Some people have mixed feelings about Seafoam, but I ran half a can through my brake booster vacuum line, and put the rest in my fuel tank. I could really tell a difference in how it ran.
You may want to try this just as an occasional cleaning of some deposits. I wouldn't make it a regular thing or ever think of it as a way to cure a mechanical problem.
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Old 06-18-2010, 12:21 PM   #10
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yeah, i bought a can recently, just haven't decided if i want to do it or not... both sides of the argument seem to have good points.
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Old 07-21-2010, 09:43 PM   #11
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check the fuel pressure to see if your getting the correct fuel pressure to the fuel injectors! also do a full blown tune up, i'm talkin plugs, wires or boots, cap and rotor ( don't think this jeep has one but could be wrong! i think it has coil packs) fuel filter, pcv valve, oil change! the coolant leak looks to be maybe coming from a lower radiator hose or possibly the water pump! if this problem presists then i would do a compression test on it to make sure you don't have a leaky head gasket! don't ever count that out of the equation, your having to put coolant in it !!!! you really don't know if the previous owner had over heated it a time or two! your air idle control valve has nothing to do with the hesitation at 2000, that sensor controls exactly what it is called ! air idle control!!!! the key on/off thing only works on chrysler vehicles 97 and below! also your map sensor could cause it to hesitate! also the tps will do that to! you can test your tps with a regular old multimeter, on the ohms setting! let me how this turns out! hope this info helps!!!! i'm a certified mechanic !!!!

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