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Old 12-01-2009, 12:03 PM   #1
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Exclamation Need some help..

We can all plainly see that im new so i already have my flame suit on..

Recently, my jeep has been running pretty badly..
I have an '03 Wrangler 'freedom edition' 4.0L AUTOMATIC (KILL MYSELF) with 65xxx miles.. Its bone stock except for an air filter cone..
Lately it has been reving at high rpms at startup and while idle..

What really concerned me was what happened today at lunch when it stalled out on me when i was at a red light and once again when i parked..

I had the timing belt, spark plugs and wires, water pump, etc. changed less than 3000 miles ago and everything was fine after that..

I talked with some people here at work and theyre saying that it could be a burnt coil thats making it stutter and shut off..

IDK WTF to do!

Any help would be greatly appreciated GEEP GURUS (<--the Gs on purpose btw..)

T.I.A.

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Old 12-01-2009, 12:21 PM   #2
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Welcome.. we don't flame here, so put the suit away.

Now a few things.. you mention you had the timing belt replaced? By chance do you mean serpentine belt? The 4.0L has a timing chain usually good till the jeep rusts away.

As for your stalling, few things come to mind...none of which may be an issue: TPS sensor (throttle position sensor) Bad fuel pump. Also ask the dealer if there is a reflash of the TCM.. transmission control module, as this was the cause on our other Chrysler product stalling... again welcome.

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Old 12-01-2009, 12:58 PM   #3
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Try cleaning the throttle body, that did a lot for me with sputtering and rough idle.
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Old 12-01-2009, 01:12 PM   #4
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your throttle position or Idle air control sensor are usually the problem with funny idleing motors and stalling. another issue it could be is a loose vacuum line. IMO its gonna be a cheap easy fix. you just gota find it.
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Old 12-01-2009, 01:15 PM   #5
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WOW..
Thanks for the quick and helpful responses.. I'm used to my audi forum (audizine.com) and its pretty much full of bashers..

4jeepn - so with that response.. Is my best bet just to take it to the dealer?

Adkjoe - is the cleaning diy project?

And would you guys happen to know of any links here on the forum already discussing this.. That way this doesn't turn into one big repost.. Lol
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Old 12-01-2009, 01:19 PM   #6
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your throttle position or Idle air control sensor are usually the problem with funny idleing motors and stalling. another issue it could be is a loose vacuum line. IMO its gonna be a cheap easy fix. you just gota find it.
Someone had told me once about how it could be the tps and I've always thought in the back of my mind it has to be a sensor issue..

Can I pick up any of these sensors at like autozone or something like that or will it still be a trip to the dealer..
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Old 12-01-2009, 01:22 PM   #7
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your IAC can be cleaned yourself. its located on the throttle body. just remove it clean off the sensor with some cleaner and pop it back in. the TPS is more of a replacement part and can be found at Vatozone pretty cheap. all very easy to do yourself. Mopar engines tend to build up alot of carbon which cause the sensors to go wacky. You can also seafoam the motor to help clear up the carbon.
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Old 12-01-2009, 01:24 PM   #8
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theirs tons of threads about it just use the search.

Cleaning the throttle body is simple. I used to do it with the the engine off but recently was told by way of this forum to do it with the engine running and it worked great. Basically, go to the store and buy an aerosol can of throttle body cleaner, take off the intake boot that connects to the throttle body, start the engine, spray down the the inside of the TB and the little hole with the Idle air sensor, then open the butterfly and spray the rest of the can into the TB. It's simple and takes about 3 minutes. keep the butterfly open and keep the RPMS up because while your spraying into it, it will bogg down. I only have 43k on my jeep and my TB was pretty dirty, it made a huge difference.

Just use the throttle with your hand right next to the TB to keep the butterfly open and the RPMS up. Try cleaning it first before you start replacing sensors.
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Old 12-01-2009, 01:52 PM   #9
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Someone had told me once about how it could be the tps and I've always thought in the back of my mind it has to be a sensor issue..

Can I pick up any of these sensors at like autozone or something like that or will it still be a trip to the dealer..
It could be the TPS but clean the IAC first. Cleaning the IAC only costs $6-7 for a can of throttle body cleaner and the IAC normally just gets dirty, it doesn't often go bad.

The TPS cannot be cleaned... when it starts acting erratically, you have to replace it which is $40-50 or so to buy from Autozone or $50-60 from the dealer who will usually have a better quality TPS.

So since the throttle body and IAC always inevitably get dirty, clean them first since it needs to be done anyway. Then if that doesn't fix your problem, then and only then is it time to replace the TPS.
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Old 12-01-2009, 03:07 PM   #10
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Thanks for the super help!
When I get out of work I'm definitely going to spray down the engine and clean the throttle body..

Hopefully its not the sendor and it is this simple..

Ill come back with an update for you guys to see if it worked or not..
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Old 12-01-2009, 08:03 PM   #11
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P.S. Don't be bummed that your TJ has an automatic. I spent considerable effort and time to convert my '97 TJ with the 4.0L engine from the factory 5-speed to the same exact transmission your TJ has. Why? Because on the 5 and 5+ rated rock crawling trails I enjoy, the automatic gives better (FAR better) control and 2-3X increased low-end torque that really helps get the Jeep up steep rock obstacles far better & easier. I did the conversion after driving it with the 5-speed for 172,000 miles... the automatic has completely transformed how well the TJ now does on extreme level trails.

Just one example... I did one trail for years that had three steep desert rock canyon climbs (we call them waterfalls even though there's no water within miles) that required winching every year. 99% of the Jeeps that went up those three obstacles required a winch, me included for all three climbs. Then after keeping everything else the same (same tires, axle ratio, etc.) but with the automatic transmission, the Jeep easily climbed those exact same three "waterfalls" without a problem... it was an amazing thing, I almost felt like I had cheated during those climbs it was so easy.
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Old 12-01-2009, 08:47 PM   #12
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Does anyone have a link or write up on cleaning the IAC with pictures and what not. Yeah I like pictures
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Old 12-02-2009, 12:13 PM   #13
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^^ that would be nice..
got too dark when i got home yesterday to try the cleaning so ill try try again today..
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Old 12-02-2009, 12:17 PM   #14
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P.S. Don't be bummed that your TJ has an automatic. I spent considerable effort and time to convert my '97 TJ with the 4.0L engine from the factory 5-speed to the same exact transmission your TJ has. Why? Because on the 5 and 5+ rated rock crawling trails I enjoy, the automatic gives better (FAR better) control and 2-3X increased low-end torque that really helps get the Jeep up steep rock obstacles far better & easier. I did the conversion after driving it with the 5-speed for 172,000 miles... the automatic has completely transformed how well the TJ now does on extreme level trails.

Just one example... I did one trail for years that had three steep desert rock canyon climbs (we call them waterfalls even though there's no water within miles) that required winching every year. 99% of the Jeeps that went up those three obstacles required a winch, me included for all three climbs. Then after keeping everything else the same (same tires, axle ratio, etc.) but with the automatic transmission, the Jeep easily climbed those exact same three "waterfalls" without a problem... it was an amazing thing, I almost felt like I had cheated during those climbs it was so easy.
Im kinda bummed..
Ive already had to swap out the tranny once before so its a continuous reminder of 'what if' .. jumping to conclusions about how it could be the tranny all the time is no fun ..

I didnt know it made it easier on the rock crawls and gives it that much of a significant amount of torque back to the jeep..
i would think it was opposite..
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Old 12-02-2009, 12:27 PM   #15
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with the auto there is no backwards roll like there is with the manual. I don't rock crawl so personally I would hate to have an auto but both have there places in the jeep world. Back in the mid 90's when I had my first jeep I didn't even know they made them in auto, just like I didn't know and still don't know why they make a 2wd wrangler.
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Old 12-02-2009, 12:27 PM   #16
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Does anyone have a link or write up on cleaning the IAC with pictures and what not. Yeah I like pictures
The IAC can often be cleaned well enough by simply using throttle body cleaner on the throttle body's interior while the engine is running. That slot just above the butterfly valve called the passage inlet is where the IAC gets its air from so letting some of the cleaner get in through that slot will clean the IAC's air passage. That will normally be enough to fix a sticky IAC but if not, the IAC is only held in place by two t-25 torx-head screws so it can easily be removed for cleaning. Use the TB cleaner, a rag & old toothbrush to gently (!) clean the IAC's solenoid actuated plunger until it's clean. Then using more TB cleaner, use a small baby bottle nipple brush to clean the hole in the TB the plunger fits into.
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Old 12-02-2009, 01:10 PM   #17
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May not be the case here, but I have heard of oily aftermarket air filters causing problems with MAP Sensors. Good luck.
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Old 12-03-2009, 07:38 AM   #18
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Wink Cleaner kit

Some of you probably know already but, for those who don't...O'Reilly's Auto Parts sells (if they have it in stock), a cleaning "kit" for the fuel delivery system. It's make by Chemtool and has two cans of cleaner, one spray for the throttle body and another that hooks up to a vacumm line (I use the line off the brake booster), all the hoses are included and simple instructions. I've used this kitfor the past several years and have had great results. I think it costs about $30.00 but is well worth trying before buying parts or having it "professionally" done.
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Old 12-03-2009, 09:30 AM   #19
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Whenever you introduce the cleaning agent via the vacuum line from the brake booster, that only cleans from that part of the intake manifold downward into the combustion chambers. It doesn't clean the throttle body, IAC, nor does it clean but a small part of the intake manifold. Cleaning via that method that way wouldn't help the OP's problem.
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Old 12-03-2009, 03:50 PM   #20
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RE: Cleaning kit

That's correct jerry, the cleaner that hooks up to the vacuum line is connected after you use the throttle body cleaner.

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