Home > Technical (L322) > 30-50mph whining sound? |
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garyRR Member Since: 13 Mar 2021 Location: Hampshire Posts: 1468 |
Resonance with the speed of the engine fan? 2015 Range Rover Autobiography 4.4 SDV8 |
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15th Jul 2023 9:45pm |
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Elliott_4.2_2005 Member Since: 14 Jul 2023 Location: Wales Posts: 13 |
Not sure, when its parked up the engine is quiet and when i build up the revs it doesn’t do it if thats what you mean, i was thinking a bearing at first. Ive pit new tyres on all round as i was told it could be that theres a flat spot due to the car being dry stored most of the year. At first i thought a bearing but was told that would get louder not stop at higher speeds. My thoughts now are maybe a drive shaft or something. |
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16th Jul 2023 6:30am |
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Merchy Member Since: 14 Feb 2021 Location: North Wales Posts: 1191 |
To rule out a bearing drive the car at 30 to 50 mph through a series of long left and right hand bends, if it's a bearing the noise will come and go as the bearings load up / unload, but this usually makes a droning noise.
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16th Jul 2023 12:59pm |
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Elliott_4.2_2005 Member Since: 14 Jul 2023 Location: Wales Posts: 13 |
Thanks Merchy, i will try this and see what happens, i did think about the supercharger but when the car is ticking over the engine is so quiet and when it starts up cold it sounds fine. I do try and listen to the supercharger as i saw that it can make a knocking noise if a pin or something on it was bent? Ive had fast high performance turbos but this is my first supercharged so i could be wrong. I’m hoping the garage will know hes a good guy and hes ex conway LR head mechanic and hes always been on top of the other landys we have so fingers crossed. |
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16th Jul 2023 6:08pm |
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Merchy Member Since: 14 Feb 2021 Location: North Wales Posts: 1191 |
At least it sounds like you have the right guy for the diagnosis, he will have lots of experience, hope its not a huge job |
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16th Jul 2023 6:52pm |
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dhallworth Member Since: 10 Oct 2011 Location: Glasgow Posts: 3090 |
Can you tell where in the car the noise seems to be coming from?
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16th Jul 2023 8:28pm |
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Elliott_4.2_2005 Member Since: 14 Jul 2023 Location: Wales Posts: 13 |
Thanks merchy hopefully its a small bill! Erm Dhallworth once im in the 30-50mph range yea it stops when i left off the power then if i carry on past 50 it gets quieter then by 70mph its gone |
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16th Jul 2023 8:59pm |
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dhallworth Member Since: 10 Oct 2011 Location: Glasgow Posts: 3090 |
1. If you’re between 30 and 50 accelerating or climbing a hill, does it make the noise?
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16th Jul 2023 9:02pm |
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Elliott_4.2_2005 Member Since: 14 Jul 2023 Location: Wales Posts: 13 |
Fair play david you just described my car perfectly haha! I’m not sure if its the front or back i can hear the noise, i looked at the history on the car because to be fair to the last guy he gave me a bible of paperwork with it, it does say ouls were changed in the diffs. Just out of interest how much should i be looking at for a diff? Its not something ive had to do on my previous cars.
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16th Jul 2023 9:08pm |
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