1994 Isuzu Trooper Won't shift.

1994 ISUZU TROOPER
196,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
GINYA1975
  • MEMBER
  • 2 POSTS
My husband has a 1994 isuzu trooper. After hauling a large load, he strated having transmission trouble. It will shift into reverse and drive, but will not come out of first gear. He replaced the transmission with a good used one, he replaced the torque converter, speed sensor relay, speed sensor in rear differential, tcm, and it is doing the exact same thing. He found a relay that says lockup off (upshift). We don't really know what that is, but we ordered another one. Any suggestions. We really need this vehicle.

Thanks.
Mar 29, 2008 at 6:58 PM
Advertisement
Avatar
MASTERTECHTIM
  • ✓ASE Certified Mechanic
  • 4,750 POSTS
  • ASE Certified Mechanic
replace the throttle position sensor. its located on the throttle body and costs about 25 bucks. everytime i get one of these that doesnt shift, i replace it and it shifts fine again. hope this helps
Mar 29, 2008 at 8:24 PM
Avatar
GINYA1975
  • MEMBER
  • 2 POSTS
We tried replacing the throttle position sensor just now with no luck. Please, any other suggestions.
Mar 30, 2008 at 1:16 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.