Isuzu D-Max Gearbox & Transmission Problems

Why wont the RPM of my 2015 Isuzu D-Max go higher than 2500?

Answered by CarsGuide 9 Oct 2020

The first thought here is that you’re dealing with a dodgy throttle-position sensor or some other sensor that is giving the on-board computer a reason not to exceed 2500rpm. Or tricking the computer into thinking that the engine is spinning faster than it really is. Have you had the vehicle scanned? It’s a cheap way of reducing a lot of the guesswork in a case like this.

Like any engine, of course, a turbo-diesel won’t rev beyond the speed that the fuel supply can support. You say you’ve changed the fuel filter, but have you checked the pump pressure and the fuel-delivery rate? A problem with the pump or fuel lines could easily produce the symptoms you have. You could even have a blocked fuel pick-up in the tank.

The other problem with modern turbo-diesels is that they are prone to clogging their intake systems with a black gunk that is a by-product of soot and oil mist from the vehicle’s exhaust-gas recirculation and crankcase-ventilation systems respectively. This black, ooze can sometimes almost completely block the intake path for air entering the engine and will cause all sorts of dramas, including the one you’re seeing.

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Isuzu D-Max 2013: Is it a lemon?

Answered by CarsGuide 15 May 2017

It’s clearly frustrating you, but I don’t believe you’ve copped a lemon on the basis of what’s happened. Isuzu fixed the diff, end of story, they also replaced the first pump under warranty, again end of story. The issue is why have two pumps failed, and why didn’t Isuzu cover the second pump. These are questions I would be putting to Isuzu. I’m guessing that the second pump wasn’t covered because the warranty had expired after three years.

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Isuzu D-Max: Any known issues with driveline or driveshaft?

Answered by CarsGuide 21 Dec 2015

Isuzu spokesman Dave Harding replies: Isuzu Ute Australia values all customer feedback. Our service team has confirmed with Mr Cooke his vehicle is not defective and that the phenomenon he was experiencing is in fact a characteristic and in no way detrimental to the safe operation of his motor vehicle".

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