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1994 Isuzu Trooper Won't shift.

Tiny
GINYA1975
  • MEMBER
  • 1994 ISUZU TROOPER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 196,000 MILES
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.
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Saturday, March 29th, 2008 AT 6:58 PM

2 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 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
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Saturday, March 29th, 2008 AT 8:24 PM
Tiny
GINYA1975
  • MEMBER
  • 2 POSTS
We tried replacing the throttle position sensor just now with no luck. Please, any other suggestions.
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Sunday, March 30th, 2008 AT 1:16 PM

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