Trans seem to slip at times when hot but it's the trans. - Jeep Garage - Jeep Forum

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Old 07-09-2015, 01:27 AM
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Trans seem to slip at times when hot but it's the trans.

I live in Yuma, AZ with VERY hot summers which somehow effects something that causes the car to seem like the transmission is slipping. Strange thing is that it only happens now and then when it is very hot outside. The rpms will rev up and the car will barely move forward but it's ok in reverse. I have replaced the throttle position sensor several times which seems to help for awhile but I never know for sure because its so erratic. Engine is 4.0 in Grand Cherokee. Has anyone had this problem or know how I can track it down? Please help.

Ken

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Old 07-09-2015, 03:58 PM
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Re: Trans seem to slip at times when hot but it's the trans.

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Originally Posted by Keninyuma View Post
I live in Yuma, AZ with VERY hot summers which somehow effects something that causes the car to seem like the transmission is slipping. Strange thing is that it only happens now and then when it is very hot outside. The rpms will rev up and the car will barely move forward but it's ok in reverse. I have replaced the throttle position sensor several times which seems to help for awhile but I never know for sure because its so erratic. Engine is 4.0 in Grand Cherokee. Has anyone had this problem or know how I can track it down? Please help.

Ken
Year, mileage, any known prior transmission service would be good to know.

Have you checked your transmission fluid fill and condition?
If this isn't your vehicle from new, is it even the correct type of ATF for that transmission?

When it slips like that, can you stand the heat long enough to pull the stick and see if there is any foaming? That can cause the transmission to pretty much refuse to move the vehicle. That reverse works sounds more like something inside the transmission getting a tad old though...
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Old 07-09-2015, 05:40 PM
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Re: Trans seem to slip at times when hot but it's the trans.

Does the problem appear in any forward gear, or only in 1st?
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Old 07-09-2015, 10:41 PM
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Re: Trans seem to slip at times when hot but it's the trans.

Thanks for the reply but like I said it's not the trans. First time it happened I had the filter & fluid changed. Sometimes just stopping for a few minutes with the hood open & it will be okay. May happen again in a few days or weeks. Never when it's cooler. I used to jiggle the wires by the throttle position sensor & that seemed to work but not always. I redid the connections there just to make sure. May be a loose wire somewhere else. 2003
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Old 07-09-2015, 11:20 PM
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Re: Trans seem to slip at times when hot but it's the trans.

If you try to accelerate and the engine revs up, but the car hardly moves, then the problem should be or torque converter, or transmission. Checking the fluid level indeed should be a first thing to do. Too low level and the pump can suck air, reducing the line pressure and causing slip. Too high level, and air will be shurned into the fluid, causing air bubbles and also reducing the line pressure which holds the clutches.
You say its not the trans, but how do you know? You messed a bit with the TPS wires and sometimes it seemed to help, but did messing with the wires help, or was it something else?
The TPS input is used for calculating shifting points, but not for applying the clutches itself. I would check the rigging of the shift cable and the throttle cable. High outside temperatures can have influence on expansion of the cables and on the whole jeep itself, so a critically adjusted cable could show itself then.
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Old 07-10-2015, 12:12 AM
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Re: Trans seem to slip at times when hot but it's the trans.

Fluid level is okay but I'll see if I can follow the wires tomorrow to see if anything is loose any where else.
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Old 09-13-2015, 09:55 AM
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Re: Trans seem to slip at times when hot but it's the trans.

I got the same problems you are saying as well. I checked my level it was high with foaming as well it almost shutters like jerking. It was doing it at mid speed 45-55 seem most pronounced. Also not a lot of throttle (1/4) cruising. I do use the recommended. ATF +4. I haven't changed out the filter or fluid for 2 yrs . I'll check those items too which you guys are suggesting. It also too was doing it with higher temps outside. Also does yours "clunk or pop" when shifting from park to reverse on first start up. I have tried drive then put it back into reverse and it doesn't make the clunk or pop sound. Just wanted to see what was out there if it where a fluid drain and a new filter. Or is a pressure plate or torque converter. Keep me posted I'm up for suggestions or fix as well. Thanks guys


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Old 09-13-2015, 10:08 AM
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Re: Trans seem to slip at times when hot but it's the trans.

A clunk or pop when shifting out of park is not unusual. With all the CV and U-joints in that drivetrain, that's just the slack being taken up when a load is applied. Even more so if it's a 4WD.
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Old 09-13-2015, 12:40 PM
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Re: Trans seem to slip at times when hot but it's the trans.

Quote:
Originally Posted by sl1980able View Post
I got the same problems you are saying as well. I checked my level it was high with foaming as well it almost shutters like jerking. It was doing it at mid speed 45-55 seem most pronounced. Also not a lot of throttle (1/4) cruising. I do use the recommended. ATF +4. I haven't changed out the filter or fluid for 2 yrs . I'll check those items too which you guys are suggesting. It also too was doing it with higher temps outside. Also does yours "clunk or pop" when shifting from park to reverse on first start up. I have tried drive then put it back into reverse and it doesn't make the clunk or pop sound. Just wanted to see what was out there if it where a fluid drain and a new filter. Or is a pressure plate or torque converter. Keep me posted I'm up for suggestions or fix as well. Thanks guys


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A too high fluid level can cause foaming (due to the moving parts churring air into the fluid). This can reduce the line pressure and cause slipping of the clutches. Only strange that the fluid was not changed lately nor any fluid added. There is no mixing of coolant into the fluid? (leaking transmission cooler inside the radiator)
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Old 09-13-2015, 02:13 PM
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Re: Trans seem to slip at times when hot but it's the trans.

I haven't driven my Jeep much this summer but one thing I did do was change the filter/fluid. It hasn't acted up yet but it always did it only sporadically anyway. Didn't have any problem with it popping though. Would act up only at lower speeds or after I came to a stop. On rare occasion at start up.
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Old 09-14-2015, 01:15 AM
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Re: Trans seem to slip at times when hot but it's the trans.

Cool man thanks for the advice I'll take a look at everything tomorrow. My jeep 4.0 4wd has been pretty good honestly. The tranny is original with 225k on it. It does need some tlc and all then engine work that I did about 1 1/2 yrs ago has performed awesome. It has 25-30k on the new engine. I do think the issues for sure are tranny related but I'll try to do the things you suggested. If I find out the problem I'll post to share with other if they are experiencing the same stuff. Love this forum.


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