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2004 hilux 3.4L auto issue going up hills


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Hi, Whenever travelling on highways at say 90-100kmh, I go up a hill and i lose speed and the revs go down down down, and i end up around 50-60kmh at super low revs. It doesnt change down a gear to get the power. What could be the cause of this? hilux is 580,000km but serviced all fluids, replaced water pump, fuel filter, not sure what else to try.

i assume even though it doesnt change down gears it still should be able to hold 90-100 foot to the floor as they are not too steep hills. how do i get the power back on this thing?



Edited by lukehilux
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  • 4 weeks later...

try taking itout off overdrive before takingon the hill it works with me and I am able to hold 90kmh without much trouble .2004 sr5 3.4,4 spd auto.


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Have the ECU scanned for any error codes. Do you have a vehicle scanner ?

It's tricky to diagnose modern cars as they are heavily controlled electronically. To ask for a mechanical solution would be premature in my opinion. There could be some electrical gremlin causing the issue. 

Another thought comes to mind and that would fuel injectors or fuel pump. You could have low fuel pressure ??

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