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Trany or Something

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gtouimet
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Joined: 07 Feb 2006
Location: San Diego, Ca.

PostPosted: Mon Feb 13, 2006 6:06 pm    Post subject: Trany or Something Reply with quote

I am new to this site, but am really liking it. You all seem to have a lot of fun and share some good knowledge. I am having a problem with what I thought was my trany. When I am on the gas accelerating to get up to speed I will studder or hesitate between gears. It does not do it every time , but enough to annoy me. I thought it was the trany (AW4) but when I took it to a shop they said that it was perfect with nothing wrong. They said the only thing they could guess was that it was a sensor going bad or malfunctioning. It was a trany specialist so he said he could not say for sure. But before I even think about taking it to a mechanic I want to try to figure it out. Any help you could give would be great.

Oh, I have a 91 auto 4.0 I6
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Mon Feb 13, 2006 7:30 pm    Post subject: Reply with quote

TPS or O2 sensor...possible crank sensor?
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96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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gtouimet
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Joined: 07 Feb 2006
Location: San Diego, Ca.

PostPosted: Mon Feb 13, 2006 8:48 pm    Post subject: Reply with quote

Do you think it would make any difference if I cleaned out the throttle body and TPS?
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Mon Feb 13, 2006 9:30 pm    Post subject: Reply with quote

wont hurt to try, but i would just clean the throttle body and replace the TPS
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ThePhantum
Pissed-Off Admin
Pissed-Off Admin


Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Feb 13, 2006 9:30 pm    Post subject: Reply with quote

Cleaning out the TB might not help, but it certainly won't hurt. Wink

The TPS on earlier 4.0's was adjustable. I'm not sure when the switch was made to non-adjustable versions, but I think (key word think) that it was made in 96 when they went to OBDII systems. Most Haynes/Chiltons manuals have the voltage ranges to test and adjust it.

From what you said, it sounds intermittent...which makes it a tough thing to diagnose. Is the hesitation in the shift itself or does the motor stumble when shifting? Does it happen under light, medium or hard acceleration (or all of the above)? Has you ever had a problem just starting it up?
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gtouimet
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Joined: 07 Feb 2006
Location: San Diego, Ca.

PostPosted: Tue Feb 14, 2006 10:26 am    Post subject: Reply with quote

It is almost garrentied to happen when under hard acceleration. I can't tell if it is the shift itself or the motor. You can feel it when it happens. You lose your momentom for a second.
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jcc152
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Joined: 27 Nov 2006

PostPosted: Mon Nov 27, 2006 8:25 am    Post subject: Reply with quote

gtouimet- Just wondering if you found a fix to this problem. I'm having the same issue with my 97 GC.
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Mon Nov 27, 2006 8:56 am    Post subject: Reply with quote

jcc152, when you hit the gas hard do you lose power? I had a problem with my 94gc that I thought was the trany that actually turned out to be the catalytic converter being clogged.

I would hit the gas and it would hesitate shifting and when it felt to me like it should shift, it would just stick in gear. I think the trans wanted to shift but the engine wasn't putting out enough power to actually engage the transmission. Then when I took my foot off the gas it would hesitate shifting and sometimes I would stall.
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jcc152
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Joined: 27 Nov 2006

PostPosted: Mon Nov 27, 2006 12:23 pm    Post subject: Reply with quote

Nah, I don't really lose power, it just seems to kinda "rumble" between gears. When it happens, I either let off or give it more throttle, and it stops. I'm not sure when the fluid/filter was changed last since I just bought it, so I'm going to do that tonight. Its kinda hard to explain, but it's exactly the way gtouimet explained it, which is why I replied here.

After doing a search, I'm thinkin it may be the TPS, since it seems to be specific to a certain spot in the throttle- but it doesn't always do it either.

Sorry, but that's the best I can do to explain it. Any ideas?
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jcc152
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Joined: 27 Nov 2006

PostPosted: Mon Nov 27, 2006 12:25 pm    Post subject: Reply with quote

Oh, and it only happens when I'm getting up to speed on the highway. When I'm driving around the city, it's fine.
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TheBrat97
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Joined: 28 Jul 2006
Location: Dallas, TX

PostPosted: Mon Nov 27, 2006 1:50 pm    Post subject: Reply with quote

I'm having the same problem with my 97...When I'm pulling out of a parking lot or something similar where I have to jump in front of traffic it will hesitate to shift into 2nd, then something will pop very loud, and it shifts. I really need to troubleshoot that.
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jeep_thrasher88
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Joined: 16 Nov 2006

PostPosted: Wed Nov 29, 2006 1:09 pm    Post subject: Reply with quote

Try replacing the fule filter brat.
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gtouimet
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Joined: 07 Feb 2006
Location: San Diego, Ca.

PostPosted: Sun Dec 24, 2006 6:52 pm    Post subject: Reply with quote

In reply to jcc152 I never found the fix to my problem. I have just worked around it. When it gets worse or when I have extra money to spend I will take it to a shop and have them just figure it out for me. I don't want to just keep replacing sensors and other stuff to hope it works. It gets too expensive. If you figure it out before me, please let me know.
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94z07
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Joined: 09 Dec 2006

PostPosted: Mon Jan 01, 2007 12:27 pm    Post subject: Reply with quote

jeep_thrasher88 wrote:
Try replacing the fule filter brat.


That'd be my first thought as well.
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TheBrat97
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Joined: 28 Jul 2006
Location: Dallas, TX

PostPosted: Mon Jan 01, 2007 1:52 pm    Post subject: Reply with quote

94z07 wrote:
jeep_thrasher88 wrote:
Try replacing the fule filter brat.


That'd be my first thought as well.


It's not the hesitation that worries me, it's the loud pop that seems to come from the drivers side front of the engine. It hesitates, pops, then finally accelerates right after the pop.
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