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88 JEEP AUTO TRANS ISSUE HELP

oldpeep

NAXJA Forum User
Location
south carolina
GUYS I'M NEW TO THE JEEP WORLD SO I NEED A BIT OF HELP. I HAVE A 88 XJ 4X4 WITH AUTO TRANS. I HAVE NOTICED HERE LATELY THAT IT SEEMS I HAVE LOST FIRST GEAR IN THE TRANS. ABOUT THE SAME TIME THE TPS SENSOR STARTED ACTING UP. I REPLACED THE TPS SENSOR BECAUSE OF ERRATIC THROTTLE. THIS FIXED THE THROTTLE ISSUE. THE ISSUE WITH THE TRANS STILL EXISTS. I REMOVED THE PAN OFF THE BOTTOM OF THE TRANS TO TAKE A LOOK. FILTER AND FLUID WERE FAIRLY CLEAN. I REPLACED BOTH FILTER AND FLUID THEN. STILL NO BETTER. JEEP IS VERY SLUGGISH AND IS GETTING VERY POOR GAS MILEAGE. ANY HELP WOULD BE GREAT. THANKS IN ADVANCE....
 
take a quick look at the fuse for the trans control module. i believe the fuse is on the right side of the dash. near the trans control module. it is kinda hidden. if that doesnt help see if you can find a shop that can plug into that renix system an do a systems test. they dont have dignostic trouble codes like others.
 
OK...THE FUSE LOOKS OK. CHECKED IT VISUALLY AND PUT A METER ON IT TO MAKE SURE IT WAS GETTING VOLTAGE. CHECKED THE SETTING ON THE TPS AGAIN JUST TO MAKE SURE I DID'T BUMP THE SETTING WHEN TIGHTENING THE SET SCREWS. IS THERE A WAY TO TEST THE TCU ? I DROVE IT AROUND THE BLOCK THIS EVENING JUST TO MAKE SURE. STARTED OUT FINE FOR HALF A MILE. THEN AT NEXT STOP SIGN TOOK OFF VERY SLUGGISH TILL ABOUT 15 MPH THEN IT SHIFTS FINE LIKE IS SHOULD. NEXT STOP SIGN SLUGGISH OFF THE START THEN PICKS UP IT SEEMS LIKE I SAID MISSING FIRST GEAR. ANY OTHER IDEAS GUYS ?
 
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