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Old 04-25-2009, 10:01 AM   #1
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Automatic Transmission Question

I have a 1997 TJ SE with the 2.5 104k miles ( I will update my profile) with the auto transmission. I believe although I haven't looked closely that it's the 30RH 3 speed. Keep in mind I had a transmission service two years ago with a filter and fluid change and adjusted by a long time Jeep transmission guy. It had been working fine for the past couple years.

I just did a tune up on this including oil change with filter, Air filter, Distributor cap, rotor and plugs and wires. I used the Crown tune up kit that you can get anywhere.

Anyways, I never had this problem prior to the tune up, but now when I run the Jeep, usually at a steady cruise, with fairly no load around 1800-2000 RPM (40 MPH) it seems to "Hunt" for a gear. Quickly downshifting for less that 1 sec, then back to OD, sometimes several times within a 10 sec span. I only had this happen a couple of times at higher cruise and a few at a very slow going through a parking lot type speed. (Hope I described this OK)

The only thing I can think of is that when I changed the Distributor cap, I may have "pulled" the kickdown cable out of adjustment when I was changin it. (I replaced the cap while keeping the old one with wires intact so I wouldn't mis install the right wires. And in doing so may have wedged it between the dipstick and TV cable.)

I read the TV cable adjustment procedure and pulled the throttle body cover off to access the "button" on the TV cable, but I sure don't see where you could press any button to release it and do what they suggest. Just a white flat maybe square clip holding the cable in place. So rather than break something ( I have a tendency to break things) I put the cover back on and let it sit in the garage.

I also have been reading about the possibility of a bad TPS that could be causing the problem. Although I just changed it a few years ago (5-8k miles ago maybe) So even though I read about them failing all the time I am skeptical. It's a summer beach jeep so I obviously don't put too many miles on it.

Has anybody got any ideas or experiences with something similar? I plan on running it up to the local Trans shop to have them look, but if it's something easy and common, maybe I'll do it myself. I don't generally mess with transmissions.

Thanks for input.

Doug

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Old 04-25-2009, 10:23 AM   #2
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To adjust the TC "kickdown" cable, you just pull out both sides of the clip slightly and then lift up on it to release the cable. Then the cable can be moved in or out from where it enters the clip as needed, then you push the clip back down to lock it into place. Properly adjusted, the bare cable that attaches to the throttle lever should just barely be snug with no slop in it.

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Old 04-25-2009, 10:47 AM   #3
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Thanks. I kept reading to "press the button" and slide the sheath back, but I couldn't see how to do that.

Do you think this might be the issue? If so, I certainly don't mind giving that a shot. If a my Transmission shop has done this a lot, I don't mind having them do it for the 50-100 theyd likely charge me. (I have done business with them on other vehicles, they are very fair)

Doug
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Old 04-25-2009, 11:09 AM   #4
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I'm no transmission guy, I'm lucky to have gotten the 32RH auto I converted to (from a 5-speed manual) installed and running as well as it is. What you're likely feeling is the torque converter locking and unlocking, what some mistake for an overdrive gear because when it locks, it drops the rpms 150 or so. But why it just started is a big question because it almost sounds like the TC cable is too tight so if it were, it should have had this problem since it was last serviced.
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Old 05-06-2009, 12:17 PM   #5
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Fixed

For anyone who runs into a similar issue, in my case it was a bad Lockup solenoid. I brought it to a very good local guy who dropped the pan, valve body and replaced the bad solenoid. He also found a ground wire touching the coil that may have contributed a bit. Adjusted everything / replaced filter, etc...while he was there. Told me everything inside the transmission looked good.

Purely a coincedence that I tuned it just prior to the issue. Runs great now. (Well, as good as an automatic 2.5cyl can)

Thanks for the input.
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