My 2018 auto gearbox runs 500-1000 revs higher when the accelerator is depressed even slightly. As soon as I lift off the revs drop before the speed changes at all.
The dealer has had it in for a total of 16 weeks over the last 8 months and seem to be incapable of understaanding what the problem is.
Mitsubishi have told them to fit a new gearbox but the dealer insists it does not need one.
Am I correct in saying this is a definite sign of a slipping transmission?

Had a similar situation with a polo a few years ago. Had to boot the problem up to VW uk who forced the dealer to buy the 100k of diagnostics to prove that VW knew better than the dealer. You might want to try a similar approach. Also, take a look at the recall list and known faults of that era, if there's something similar then that just gives you a leg up. Dealer's just trying to be a dick for the costs involved. How close is an alternate dealership?

Thank you. other dealers are quite near, but in my experience car dealers are all stupid.

Mitsubishi say they leave it up to the dealer.

just take it back leave it there get a courtesy vechile until it is fixed!

I did that. 16 weeks later I got it back in exactly the same condition.

No experts here then?

Have you/they done a stall test? You put it into each gear manually, foot on brake and press throttle to the floor, revs will go up to a certain point and thats it, too high or too low and you have a problem. I'll find the rpm hang on..

Not sure about 2018, but earlier models were all 2200 to 2700 rpm.

Quote: mikeinatruck wrote in post #8

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Have you/they done a stall test? You put it into each gear manually, foot on brake and press throttle to the floor, revs will go up to a certain point and thats it, too high or too low and you have a problem. I'll find the rpm hang on..

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