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Home > General & Technical (L663) > D300 - Faint squeaking with accelerator outside the car.
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Gareth



Member Since: 12 Dec 2011
Location: Bramhall
Posts: 1073

England 
D300 - Faint squeaking with accelerator outside the car.
With the recent warm weather, I’ve been driving with the windows down. This has made me aware of a faint metallic squeak that coincides with slight application of accelerator, and again a couple of seconds after releasing the accelerator.

After engine switch off the turbos two actuators both exercise themselves a few times, but don’t seem to squeak. I have sprayed them with wd40 to see if it makes a difference but it didn’t.

Are there any other valves on the exhaust system that could be making this noise? I thought it might be a loose heat shield, but can find anything loose. All seems secure down there. It is a very faint metallic squeak if you know what I mean.

My fear is that it could be the vanes inside the turbo making the noise, which I don’t think would be anything I could easily fix. 🤔 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy
1968 S2a 88 aka Bob
2014 Jaaaag F Type 3.0 Supercharged.
Post #1038274 24th Jun 2024 3:09pm
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Hairy Dan



Member Since: 25 Apr 2013
Location: NW Durham
Posts: 1394

United Kingdom 1998 Defender 90 V8 Petrol 50th Auto Chawton White
It's not the idler pulley is it? There was a recall out for it and mine would chirp especially when it was cold, had my idler and belt changed twice under the recall as the 1st one only lasted 6 months and then started chirping again. Cheers Ian
--------------------
22MY Defender 110 D200 SE, Fuji White.
Kielder 4x4 Safari
Instagram @defender_v8
Post #1038284 24th Jun 2024 4:50pm
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Hairy Dan



Member Since: 25 Apr 2013
Location: NW Durham
Posts: 1394

United Kingdom 1998 Defender 90 V8 Petrol 50th Auto Chawton White
Found this thread https://www.defender2.net/forum/topic90614.html? but I'm sure there is one with the recall details on it but can't find that at the moment. Cheers Ian
--------------------
22MY Defender 110 D200 SE, Fuji White.
Kielder 4x4 Safari
Instagram @defender_v8
Post #1038285 24th Jun 2024 4:54pm
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Gareth



Member Since: 12 Dec 2011
Location: Bramhall
Posts: 1073

England 
No it’s had the recall for that. It’s definitely a squeak that occurs when the accelerator is pressed lightly. I’ll have a good look underneath when I get a chance. It does it at a standstill if the accelerator is blipped. Sounds very much like an exhaust valve that needs lubricating, opening and closing. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy
1968 S2a 88 aka Bob
2014 Jaaaag F Type 3.0 Supercharged.
Post #1038323 24th Jun 2024 10:09pm
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eno



Member Since: 15 Apr 2024
Location: Qld
Posts: 12

Australia 
Are the turbos variable geometry type? If so, it might be the turbine housing vanes moving.
Post #1038326 25th Jun 2024 2:03am
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nebc100



Member Since: 07 Nov 2023
Location: Altlinster
Posts: 83

Luxembourg 
I don’t know if this is the same, but my D5 tdv6 has a back-pressure valve in the exhaust.

I had an issue where if I blipped the throttle at standstill (and sometimes when I was driving slowly) I would hear a squeak.

It turned out to be this back-pressure valve.

It was replaced under warranty… half of the exhaust!!!
Post #1038328 25th Jun 2024 5:04am
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Gareth



Member Since: 12 Dec 2011
Location: Bramhall
Posts: 1073

England 
That sounds very much like what I’m looking for. Do you know where in the exhaust the valve is? I’ve checked the turbo vane actuators and linkages, and they are free and don’t squeak. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy
1968 S2a 88 aka Bob
2014 Jaaaag F Type 3.0 Supercharged.
Post #1038331 25th Jun 2024 7:19am
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nebc100



Member Since: 07 Nov 2023
Location: Altlinster
Posts: 83

Luxembourg 
Sadly, it is an "maintenance free" part, and when I had the issue with my D5, it was replaced under warranty.

Here is a part of the exploded diagram of the rear half of the exhaust system on the D5... I have circled the part in red.

I don't know if the D300 has the same system though...

Post #1038332 25th Jun 2024 7:30am
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nebc100



Member Since: 07 Nov 2023
Location: Altlinster
Posts: 83

Luxembourg 
I have just checked on the exploded diagram for the diesel L663... It looks like you have the same part... But looks as though it can be replaced separately (unlike on the D5)



Click image to enlarge
Post #1038333 25th Jun 2024 7:34am
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Gareth



Member Since: 12 Dec 2011
Location: Bramhall
Posts: 1073

England 
That’s fantastic information, thanks very much. The location seems to correlate with where I think the sound is coming from. I’ll have a look when I get a chance. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy
1968 S2a 88 aka Bob
2014 Jaaaag F Type 3.0 Supercharged.
Post #1038342 25th Jun 2024 9:09am
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