Jeep Cherokee Talk banner
1 - 4 of 4 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
Hello all, I recently picked up a 1999 jeep XJ with 203K on it. Have done all the basic tune up procedures and fixed any leaks that were present. Running great. Recently however, I took the jeep on a 2000 mile road trip to Yellowstone out of Portland Oregon. I noticed on this trip that when climbing hills and when strong head winds were present, the transmission would shifting between gears rather quickly a few times until it eventually decided on a gear. Cruise control also doesn’t seem to work anymore, but I’m not sure if this is related. Recently replaced TPS so I don’t think that could be causing it. Jeep shifts and accelerates find in street driving and has never slipped in any scenario. It is also worth noting that the highways on the trip were mostly 80mph which I’m not positive the transmission is happy with when it comes to picking a cruising gear. Lastly, my transmission fluid is clean DEX/MERC and is to the proper level (maybe a hair over the max mark on the dipstick). Any thoughts?

thank you,

james
 

·
Premium Member
Joined
·
10,255 Posts
If you are talking about those headwinds in the Columbia Gorge, yes they will make you shift down. Down shift is controlled mainly by the throttle position sensor. Press down on the gas enough and it will make it down shift
 

·
Super Moderator
Joined
·
11,054 Posts
During your tune up, did you adjust your TV cable? Also, check all your grounds and make sure they are clean. Any Vacuum leaks should be fixed. Even a small one can impact performance.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #4 ·
During your tune up, did you adjust your TV cable? Also, check all your grounds and make sure they are clean. Any Vacuum leaks should be fixed. Even a small one can impact performance.
I have now given the TV cable an adjustment and would like to add that when the cruise control doesn’t work and the transmission shifts erratically, I can make the cruise control work again by tapping the brake pedal a few times. And sometimes it will hold and sometimes it will go out of cruise control when I try to accelerate. This leads me to believe the brake pedal switch is causing the problem here. There is also a very dirty ground on the engine block right by the oil filter (the one holding the oil dipstick). I will clean this as well to remove a variable. Any other ideas?
 
1 - 4 of 4 Posts
Top