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 11:58 AM
Advertisement
Avatar
MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
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 1:24 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 6:16 AM
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.