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Old 02-01-2011, 04:39 PM   #1
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o3 wrangler 2.4 wont idle

I just picked up a pretty sweet 03 wrangler today. And when it is first started it rus great but as it warms up it will not idle. and also i noticed theres not alot of power when driving under a load. when its running it revs good but when driving it seems like i'm pulling a car behind. Where do i start.

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Old 02-01-2011, 05:09 PM   #2
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idle

I would check for vacuum leaks for the idle problem. One quick way of doing this is to spray around the intake with starting fluid, if the rpm's climb then you know that area is sucking air. (some people may not fell comfortable doing this, I have done it many times without incedent...if you dont feel comfortable there are other methods as well...just visually inspecting your intake manifold and all vacuum lines is a good start.) This could also be part of your low power problem...so I would get that sorted out first before you start pulling your hair out on the low power issue.

One other thing you may want to check is your fuel filter/fuel pump to make sure you are getting good fuel to the engine and if the engine is carburated check to make sure that the choke is not sticking.

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Old 02-01-2011, 05:12 PM   #3
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Thanks I will give it a look
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Old 02-01-2011, 05:48 PM   #4
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I have sprayed all around the intake,vacume lines and still have not found any leaks. but it will run by itself for about 10 minutes or until it gets warmed up and then BLAAAHHHH.
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Old 02-01-2011, 06:23 PM   #5
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clean up the throttle body and idle control valve.
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Old 02-01-2011, 06:28 PM   #6
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idling problems

Is it carburated or injected? If it is caburated what I would reccomend is looking at your plugs, if they are fouled, I would say that it is probably over fueling, one thing that will help if the engine has set for any length of time is to start it up and pull your air cleaner off. Rev the engine up and then using your hand starve the carb for air with your hand by covering the top until it almost dies, do this several times it helps "clean out" the internals by creating a high vacuum in the carb. Again some people are not comfortable with some of these teqniques. I picked that one up from an old guy who has repaired more carburated engines from jeeps, small block chevies than most of us have ever seen.

If that does not work another thing that you can check. (if it is carburated) is to see if your float is sticking in the carb, sometimes if the float is stuck and/or the needle and seat are not seated properly, once the engine runs for a while the carb will start over-fueling as the bowl is over full and just spilling raw gas into the intake, you may be able to just take the top off and clean the bowl and the needle and seat, if it is too bad you may need to put a carb kit in and replace these parts.

I would definitely try the revving/starving teqnique first, I have had good success with that on alot of older vehicles that have set for awhile without running...and I have alot of old vehicles... (57 chevy, 64 vette, 69 ford pickup...and have built/sold many others 68 camaro, 63 chevy pickup, 57 ford pickup....etc. etc. etc...growing up in Montana no one I knew ran new vehicles so we had to make the ones we had run!!)

Hope this helps
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Old 02-01-2011, 07:21 PM   #7
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^all TJ's are fuel injection
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Old 02-01-2011, 09:00 PM   #8
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injected

My bad...in that case you are on your own! I have very little experience on newer automotive repairs...My little brother is a GM mechanic, so I defer to him on anything in the last 20 years! Good luck.
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Old 04-16-2011, 09:24 PM   #9
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Wanted to bump this to see if the op had resolved the idle problem. I have the same thing!
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Old 04-16-2011, 10:11 PM   #10
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If the problem only occurs once warmed up i would think it may be a sensor of some sort starting to go bad.
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Old 04-16-2011, 10:29 PM   #11
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Mine is the exact same way. Two days ago it was peppy and really drove nice and now it idles strange and feels like its pulling a car as well. I changed the TPS IAC and tune up, still no change. I'm guessing it's a o2 sensor
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Old 04-17-2011, 12:26 AM   #12
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I had at the dealership and they were having all sorts of problems with it and said they couldn't even get it to start, wanted to replace the ECM. I towed it back home, charged up the battery and it still starts fine but now there's no throttle ccontrol at all! Haven't run the engine much because the battery is still charging.
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Old 04-17-2011, 06:26 AM   #13
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Have you checked your coil?
Side note, mine would completely die for no reason and crank crank crank.. Eventually it would start and run fine. Turned out to be the crank sensor.
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Old 04-17-2011, 04:05 PM   #14
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No, I'm not sure how I would check it but the dealership left the bolts out of the coil block so it's just free moving. But I checked it again today and there is a nasty high pitched squeal coming from the front of the engine. I think there may be a bearing out that is causing massive strain on the engine which is killing the idle.
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Old 04-18-2011, 06:12 AM   #15
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Quote:
Originally Posted by crdub09 View Post
No, I'm not sure how I would check it but the dealership left the bolts out of the coil block so it's just free moving. But I checked it again today and there is a nasty high pitched squeal coming from the front of the engine. I think there may be a bearing out that is causing massive strain on the engine which is killing the idle.
That would have to be a SERIOUS strain... Good luck!
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Old 04-18-2011, 11:04 AM   #16
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Sorry for threadjacking!! Turns out it wasn't a bearing on the accessory or timing belt lines, it's something internal. I'll start a new thread.

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