Turbo issue?

Hawkesman · 6th March 2020, 17:03

Hi. Got a 2003 75 1.8T which has developed a noise when accelerating. I'm pretty light-footed, and the noise (a sort of low squeal) only happens when I use more throttle than normal, at any revs, but not when I'm cruising at a constant speed. Note that it doesn't do it at all when when the car is stationary and the engine is revved (i.e. not under load).

Wondering if maybe it's a fault with the turbo, which presumably only really kicks in when you open up the taps. Grateful for any ideas guys! Thanks.

roverbarmy · 6th March 2020, 17:04

Squeals can be belts slipping. Check that they are tight and in good condition.

Could also be clutch slip or slave bearing.

Hawkesman · 6th March 2020, 17:10

Thanks, but why would they only squeal when I apply more throttle? The noise isn't dictated by the revs, only by the amount of throttle I use.

COLVERT · 7th March 2020, 09:56

Unlikely to be the turbo as the bearings are basically oil.

ie. Quiet.---They run at very high revs. Maybe up to 70,000 rpm.

No oil and the turbo would seize in seconds.

Sounds more like a slight air induction leak as it seems to appear when the engine demand for air increases with a greater throttle opening.

trikey · 7th March 2020, 21:38

Pull the pipe of the turbo and check for free play in the turbo shaft, I have seen these wear and the vanes then rub against the housing under load, this can cause the squeal you mention.

6th March 2020, 17:03	#1
Hawkesman Regular poster Rover 75 Saloon Join Date: Dec 2018 Location: Reading Posts: 43 Thanks: 22 Thanked 2 Times in 2 Posts	Turbo issue? Hi. Got a 2003 75 1.8T which has developed a noise when accelerating. I'm pretty light-footed, and the noise (a sort of low squeal) only happens when I use more throttle than normal, at any revs, but not when I'm cruising at a constant speed. Note that it doesn't do it at all when when the car is stationary and the engine is revved (i.e. not under load). Wondering if maybe it's a fault with the turbo, which presumably only really kicks in when you open up the taps. Grateful for any ideas guys! Thanks.

6th March 2020, 17:04	#2
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,050 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	Squeals can be belts slipping. Check that they are tight and in good condition. Could also be clutch slip or slave bearing. __________________ Oil in my veins!

7th March 2020, 21:38	#5
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Pull the pipe of the turbo and check for free play in the turbo shaft, I have seen these wear and the vanes then rub against the housing under load, this can cause the squeal you mention. __________________ Lest we forget..

6th March 2020, 17:10	#3
Hawkesman Regular poster Rover 75 Saloon Join Date: Dec 2018 Location: Reading Posts: 43 Thanks: 22 Thanked 2 Times in 2 Posts	Thanks, but why would they only squeal when I apply more throttle? The noise isn't dictated by the revs, only by the amount of throttle I use.

7th March 2020, 09:56	#4
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Unlikely to be the turbo as the bearings are basically oil. ie. Quiet.---They run at very high revs. Maybe up to 70,000 rpm. No oil and the turbo would seize in seconds. Sounds more like a slight air induction leak as it seems to appear when the engine demand for air increases with a greater throttle opening.