Isuzu MU-X FAQs
Transmission slipping in my 2015 Isuzu MU-X
This sounds like a case of low transmission fluid. Check the transmission dipstick according to the instructions in the owner's manual to see if the level is where it should be. Low fluid level can cause all sort of problems from slipping to a lack of drive to uneven shifts and shifts occurring when they shouldn't. Also, try to find out what fluid was put in the transmission when it was last serviced. The wrong type or grade of fluid can cause the same types of problems as not enough fluid.
If the fluid checks out, then you need to start looking at other causes such as glitches in the on-board computer that controls the driveline. An electronic scan of the vehicle would be the next step.
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I have a 2015 Isuzu MU-X. I have heard a whistling noise which was intermittent. It sounded like chains dragging on the ground when towing a trailer...
Blown turbochargers are hardly an unknown problem on the MU-X or many of the other popular modern turbo-diesel engines that work pretty hard and make lots of horsepower and torque for their capacity.
Some owners report a rattling, metallic noise such as yours; others reckon the sound of a dying turbocharger is more like an air-raid siren. Either way, the turbo needs to be changed sooner rather than later, to avoid the chance of bits of broken turbo being sucked through the rest of the engine with catastrophic results.
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When towing, is it better to run the gearbox in fourth or fifth gear?
Conventional wisdom is that an over-drive gearbox (such as your five-speed) shouldn’t tow anything heavy in top gear. The loads placed on the transmission via the over-driven fifth ratio can cause internal transmission damage.
Also, by leaving the engine in fourth gear (locking out over-drive in the automatic version) you stand to have the engine operating squarely in its comfort and torque zone, rather than lugging along in a too-tall ratio.
So that’s the nutshell answer: Save fifth gear for downhills and tail-winds and keep the load off the transmission.
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