Auto trans keeps shifting back N forth from "OD" to "drive" - Jeep Wrangler Forum
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Old 02-17-2014, 01:07 PM   #1
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Auto trans keeps shifting back N forth from "OD" to "drive"

Greetings, my 1998 Wrangler 4 cyl/auto trans keeps shifting back & forth from "OD" to "drive" at any speed. The fluid is perfect and at proper level. It seems that the accelerator pedal is "really touchy" and might be engaging the "passing gear" prematurely. (it's too cold out for me to look now) but what activates the passing gear when you mash the pedal? Is there a cable to the trans for this? If so, is there an adjustment procedure for this?

I used the terminology of "OD" eventhough its the torque converter coming out of "lockup".

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Old 02-17-2014, 02:17 PM   #2
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The lockup torque converter is supposed to unlock if you give it a little gas, then lock back up once you're cruising again. You're right it's not an Overdrive it is shifting in/out of.

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Old 02-17-2014, 08:48 PM   #3
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I understand your comment but if I move the gas pedal ever so slightly or if I hit a bump and my foot moves just a bit on the pedal, the torque converter unlocks and the tach goes up a few 100 rpms as it goes back into "drive" as if the trans cannot find a "happy sweet spot".
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Old 02-17-2014, 10:18 PM   #4
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Are you running oversize tires and the stock axle ratio?
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Old 02-18-2014, 09:31 PM   #5
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I would experience that same event in my dodge ram pickup, the diesel threads explained that it could be an issue with your battery terminals being dirty and not receiving consistent juice. It in turn causes the sensors to send bad info to computer. The remedy was to pull cables off battery, clean terminals, turn ignition on to bleed parasitic electricity out of system,turn ignition back off, re install battery cables, jump inside jeep turn ignition on, depress accelerator pedal to floor slowly then release, turn off, then your ready. That resets throttle position sensor. This process would remedy my truck from hunting for OD and drive.
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Old 02-19-2014, 06:25 AM   #6
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had the same problem with my 93 grand. replaced the throttle position sensor and all was fixed.
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Old 02-19-2014, 01:44 PM   #7
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Everything is bone stock. Tires,gears and drivetrain.
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Old 02-19-2014, 02:37 PM   #8
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Quote:
Originally Posted by pakev45 View Post
had the same problem with my 93 grand. replaced the throttle position sensor and all was fixed.
I was going to ask if the transmission "hunting" could be related to the TPS because I thought that my '99 with the 32rh had that problem for the previous owner. Sounds like a good place to start.
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Old 02-28-2014, 10:41 AM   #9
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Well, I us3ed a scan tool to test the TPS. as it sat "static" it registered 16.8% and 70% when fully depressing the accelerator to the floor. Should I replace it or is this considered normal?

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