Rough/rumbling noise at 1500rpm when accelerating, particularly loud in 6th
2019 Mitsubishi L200 2.4

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MGoodwin
Driver
1 points

Problem added: Jul 26, 2021 (1 month ago)
My turbo blew at 69000 miles, fortune to replace; since then it makes this awful rumbling rough type noise. Thought maybe it was serviced with rubbish oil so done a full service myself, checked around and under the vehicle to make sure nothing was loose.
It drives much better now (definitely cheap crappy oil used previously when turbo was fixed and oil flushed x3) but the bloody noise is still present.
Really starting to get on my goat. It’s fine drowning it out with music/radio on my own. But with other people in the car it’s really annoying.
Any info or points in the right direction would be great.
I’m starting to think it’s some kind of air/exhaust leak? Hoping it’s nothing I have to throw another 3 grand at.
TIA
Car: Mitsubishi L200
Variant: 2.4
Model Year: 2019
Category: Running Rough, Starting & Power Loss
Leaks & Noises
Replies and Fixes
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whittingehame
Legend
21,029 points

Jul 26, 2021 (1 month ago)
Can you hear it at 1500 rpm when vehicle stationary or only when driving ? Check all hoses , turbo hoses , air filter , air intake .
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MGoodwin
Driver
1 points

Jul 27, 2021 (1 month ago)
Thanks for your response.
It is only occurring when driving from 1500rpm to around 1700rpm. Noise not present when stationary.
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whittingehame
Legend
21,029 points

Jul 27, 2021 (1 month ago)
When you get a noise that you cant replicate when stationary and can drive through it at 15/1700 rpm it's hard to pinpoint . No exhaust heatshields or mountings loose , tap cat convertor and silencer boxes for any loose baffles etc ?
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MGoodwin
Driver
1 points

Jul 27, 2021 (1 month ago)
I’ve had a couple of hours this morning under the bonnet and car. Nothing at all loose. Nothing, as far as I can tell is leaking either.

I’m beginning to think it’s in the gearbox/transmission area, possibly....???
3-4 gear synchro is on its way out, could the sound be linked?

I’ve booked it in for next Monday at my local garage.
Hopefully they take a look and run some tests and get to the bottom of it, if I can’t beforehand. 🤞🏼🤞🏼
Avatar
whittingehame
Legend
21,029 points

Jul 27, 2021 (1 month ago)
Obviously if you decide to do 3/4 synchro it means a box strip down and you can then check layshaft bearings and other bearings at same time . Hopefully check on Monday turns up something minor .
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