1990 Nissan Pathfinder Shift Problem

NISSAN PATHFINDER
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KSBUNNY
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  • 1 POST
1990 Nissan Pathfinder, had Trans. flushed in April then in Sept. started having problems would have to let off gas to shift and would squall as a belt will when loose. Tightened all belts still had problem all mechanics said overhaul. Got some Lucas Trans fix and put it in and problems have all but stopped still back off gas on shifting just to not push it hard in case. but no more squall. Do I still need overhaul or is there another problem. :roll:
Dec 22, 2006 at 5:06 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Dunno if its an ECT type-if it is check the Throttle Position Sensor and the Vehicle Speed Sensor to include the Coolant Temperature Sensor

The 3 items above communicates with the computer to provide a smooth upshift and overdrive

Note: if the engine is not running right it will cause the tranny to act up.
Dec 22, 2006 at 7:17 AM

Suggested Repair

If the transmission is electronically controlled, check the throttle position sensor, vehicle speed sensor, and coolant temperature sensor, which help the computer control upshifts and overdrive. Also verify that the engine is running properly, since engine problems can affect transmission behavior.

Conversation Summary

The owner of a 1990 Nissan Pathfinder reported delayed shifting and a squalling noise after a transmission flush. Mechanics recommended an overhaul, but Lucas transmission additive stopped the squall, although the owner still eases off the throttle during shifts. The expert suggested checking the throttle position, vehicle speed, and coolant temperature sensors on an electronically controlled transmission and noted that poor engine operation can also cause shifting problems.

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