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Unread 09-15-2010, 05:29 PM   #1
Smith
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2005 jeep tj needs help

Hello all, I am having a problem with my 2005 tj 4.0L, i will try to explain as best i can , the most notisable time is in stop and go traffic ,the throttle is supper touchy when trying to keep a steady speed or ajust speed to traffic ?, it also bougs down when accelerating then kicks in , it will also decelerate supper fast after say doing 110 KMS then i take my foot of the gas it slows supper fast with no brake ?? , the has been time where i get 200 kms to a tank of gas and some times like 400 KMS ?? ,

I have replaced all 4 o2 sensors , coolant temp sensor , new plugs , oil/filter , k&n is good condition ,, i have also replaced a couple loose exhaust bolts ,and the problem is still there , this problem is not all thetime , but seems to be getting worst , when its not doing it , the jeep is great ,

I thank you in advance for any help ,,,,,,,,,,,,,

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Unread 09-15-2010, 05:33 PM   #2
basssolow5
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possibly the map sensor?
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Unread 09-15-2010, 05:48 PM   #3
RaggedOleMan
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Quote:
Originally Posted by Smith View Post
Hello all, I am having a problem with my 2005 tj 4.0L, i will try to explain as best i can , the most notisable time is in stop and go traffic ,the throttle is supper touchy when trying to keep a steady speed or ajust speed to traffic ?, it also bougs down when accelerating then kicks in , it will also decelerate supper fast after say doing 110 KMS then i take my foot of the gas it slows supper fast with no brake ?? , the has been time where i get 200 kms to a tank of gas and some times like 400 KMS ?? ,

I have replaced all 4 o2 sensors , coolant temp sensor , new plugs , oil/filter , k&n is good condition ,, i have also replaced a couple loose exhaust bolts ,and the problem is still there , this problem is not all thetime , but seems to be getting worst , when its not doing it , the jeep is great ,

I thank you in advance for any help ,,,,,,,,,,,,,
Not sure I can give you any real help on this other than to say my 2005 Tj has similar jerky responses in stop & go traffic. Indeed, I dread stop & go traffic & these characteristics make it even worse, eh? It's behaved like that from day 1, and I bought it brand new from a dealer in April of 2005. It has a 6sd, so I can mitigate the jerky effects with the clutch, and I do. That said, it still has the factory clutch in it...130k +...

Consequently I, too, am interested in the responses to this thread!
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Unread 09-15-2010, 05:53 PM   #4
GOLENJEEPTJ
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I personally would suspect your throttle body need a good cleaning.
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Unread 09-15-2010, 06:32 PM   #5
Smith
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I would like too add , the condensation problem out of the tail pipe , i havr=e never seen anything like it ???
i have cleaned the throttle body ,and have a new clutch with 1200 KMS
there is also a lifter noice that comes and goes ??
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Unread 09-15-2010, 06:33 PM   #6
Smith
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Originally Posted by basssolow5 View Post
possibly the map sensor?
Is it possable to have a bad map with no codes ???
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Unread 09-15-2010, 06:35 PM   #7
RaggedOleMan
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I would like too add , the condensation problem out of the tail pipe , i havr=e never seen anything like it ???
i have cleaned the throttle body ,and have a new clutch with 1200 KMS
there is also a lifter noice that comes and goes ??
It's my understanding that's part of your evap system and absolutely normal. Mine does it, too.
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Unread 09-15-2010, 07:50 PM   #8
basssolow5
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Is it possable to have a bad map with no codes ???
it may not have failed compleatly. it might just be reading wrong due to sludge and whatever else inside of it. in which case you will need a new one. ive found that cleaning them usually doesnt cut it.
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Unread 09-15-2010, 09:08 PM   #9
jr03
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Have you checked the throttle position sensor(TPS)? believe the 05's still have them. A bad connection or bad sensor will give a spikey voltage signal to the computer. A bad crank position sensor could throw the timing off too. The ones on some older Dodges would get a little crack that let moisture in and cause weird things. A bad TPS, MAP sensor, or IAC won't usually throw a code unless they get to the point of effecting emissions. Just some other things to consider Also there are some other threads on 2005/2006 4.0l having some cam problems causing wear on cam syncro gear.

Last edited by jr03; 09-15-2010 at 09:29 PM..
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Unread 09-17-2010, 08:18 AM   #10
basssolow5
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Have you checked the throttle position sensor(TPS)? believe the 05's still have them.
thats right. they all did up until the jks of 07. thats when they went to drive by wire. that could also be it.

Quote:
A bad crank position sensor could throw the timing off too.
true, but i personally have never seen one that didnt just cause the whole vehicle to die.
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Unread 09-17-2010, 10:05 AM   #11
Smith
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One more thing i have noticed , when my jeep is acting up , it diesels when i shut it off ??? when its not doing this ,, i shuts off fine like it should ?????
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Unread 09-17-2010, 11:06 AM   #12
jr03
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Dieseling is usually carbon build up in cylinders igniting and burning I think. High idle, too rich mixture at idle are possible contributors to that. There should be an idle air control on your TB that controls amount of air when throttle plate is closed or near closed. A bad IAC can be intermittant and cause or contribute to all the symptoms you described. The IAC trys to adjust air to maintain the rpm the computer wants. I'm just throwing some things out there, there are so many variables with sensors and controls you may need to connect a scan tool to it and watch what some of the readouts are.
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Unread 09-23-2010, 01:50 PM   #13
Smith
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Hello All , So i have replaced the MAP sensor , IAC , pulled the throttle body and cleaned it , and i have also pulled the OPDA, to check the sync gear and all looks good , I am still having a little bit of an issue with this problem , it is lacking power some times and really hard on gas and still some times it feel like theres a jake brake on it when i let off the gas (but not all the time ),IM STUMPED

IF any body has any ideas , im all ears !!!!!!!!
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Unread 09-23-2010, 01:52 PM   #14
YellowX
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Anybody else think this is a vacuum leak?
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Unread 09-23-2010, 06:58 PM   #15
jr03
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I would check the intake manifold and vacuum lines for leaks and the exhaust manifold for leaks/cracks which might make the o2 read lean. Also a bad cat could be cause, maybe partially clogged or have loose piece that is moving around and causing occasional restriction
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