D40 Loosing Power

Submitted: Saturday, Nov 07, 2015 at 18:22
ThreadID: 130830 Views:2604 Replies:5 FollowUps:2
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I have a Nissan D40 diesel ute with auto not shifting properly. When I am accelerating (either from a standing start or as I breast a hill) the speed rises to a point where a gear box up-shift should take place. if I am using full throttle, instead of the box up-shifting the engine looses power and my travelling speed reduces if I do not lift the throttle pedal. This initially happened when pulling in 3rd gear with a 2,000 kg caravan in tow. It is now happening when the box should be shifting up from 1st and 2nd gear as well.

If I am doing the same full throttle acceleration with a particular gear manually selected the motor will run above the gear box change revs and I can rev the motor to red line on the tachometer.

Everything happens normally when using a light throttle.

Does anyone have any theories on what's happening
PeterD
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