D40 Loosing Power
Submitted: Saturday, Nov 07, 2015 at 18:22
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Nomadic Navara
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
Reply By: Ross M - Saturday, Nov 07, 2015 at 23:08
Saturday, Nov 07, 2015 at 23:08
I would remove and clean any magnetic pulse type sensors which are clamped/bolted into the autobox. If they, especially the speed sensor, is fluffy with magnetic crap/filings/fuzz then the speed sensor won't be able to indicate to the ECU what is happening, then it will derate the performance.
Try the easy things first.
Just changing the fluid in an auto won't alter dirty/fluffy sensor action.
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Follow Up By: Les - PK Ranger - Sunday, Nov 08, 2015 at 00:36
Sunday, Nov 08, 2015 at 00:36
Quite probable, the wifes little Getz wasn't changing up to third as it should have, just hanging on, a new sensor on the trans fixed it.
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