My jeep has 155k on it. Just recently Ive been having some problems with the auto trans. Jeep shifts just fine all the way up to about 65-70 mph, but cruising at that speed and then slowing down a bit to change lanes, or slower vehicles in the way causes the rpms to jump a bit back and forth around 2k rpm. Now Im not exactly sure what it feels like if the transmission is slipping. The transmission fluid is the normal reddish pink color, nothing wrong with the level of fluid either. Ive checked it after my 45 mile ride home from work and its not frothy or too hot.
The problem seems to be getting worse. While driving home a little while ago the rpms were jumping back and forth a bit going about 50 mph, steady speed, no braking. The rpms are not shooting way up just jumping and vehicle loses a bit of speed. Could it be something other than the transmission?
I guess Im going to have to take it in to a shop to have it looked at, just trying to see what you guys think the problem might be so I know what to expect. Thanks
After you just posted that about the torque converter locking up I searched around online. Thats exactly what it seems like, I read something about a lockup solenoid? Im going to take it to a shop in a day or so. If it is a problem with the torque converter, what kind of money should I expect to pay for a repair?
If you guys think it could be an engine issue. What type of problem?
thanks for all the replies. I dont know much about the jeep even though Ive had it for over 10 years. Thanks to this forum though Im learning
Its funny I considered getting rid of it a few weeks ago, now that I found the forum I wanna keep it and fix it up.
its rather tough to diagnose a drivability issue from a key board but could be anything from a sensor to a spark plug and by reading your post it strikes me as drivability issue not nessesary trans prob. and good point when was last tune up
I have a 99' with 113k that just started doing the exact same thing. I'm leaning toward a torque converter issue over anything else. Yes I've checked this and that.. Everything is up to par. Have a friend that's a tranny tech. Gonna have him drive it by the weekend.
I took the jeep to the dealer today. I drove for about 20 minutes or so to get over there, wouldnt you know the damn thing drove fine no issues. They checked it out, test drove it and all. No stored codes. Didnt do it on the way home. Unreal.
Has anything ever been done on your engine so the transmission's kick-down cable might be out of adjustment? This cable connects between the throttle body's linkage and the transmission. This is the cable that tells the transmission you are pressing hard enough on the gas pedal to indicate you want the transmission to downshift into passing gear with a dramatic push on the gas pedal, or to unlock the torque converter with a more gentle nudge on the gas pedal.
Your transmission, which is a 32RH, does have a locking torque converter that locks the torque converter once it reaches cruising speed. When the torque converter locks is dependent on several things including speed, input on the accelerator pedal (via the throttle position sensor), engine temperature, and engine rpm. The torque converter's lockup solenoid is located inside the transmission but it's not hard to get to.
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Thanks Jerry for all the info. No work has been done on the engine except for routine service. I kept doing research on the internet about all the problems Im having. I think I may not have described the issues Im having well enough (my fault). The only thing I can come up with now is that it may be the fuel pump starting to go bad. I read somewhere that can cause problems intermittenly in the beginning, especially at higher driving speeds. I would think that would bring up a code (maybe not though) It has been hard to diagnose because it comes and goes quickly. I originally ruled it out because i wasn't having any problems at all starting the engine. Just today though I did notice that when I shut the engine off it would just completely shut down in a millisecond (almost too quick to be normal) instead of a bit more gradual. Sounds crazy I know, but I really notice a difference.