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DefenderCan



Member Since: 25 Nov 2023
Location: Canada
Posts: 7
 2006 Defender 110 Td5 CSW Alpine White
Td5 Startup Thumping Noise
Good morning All,

My first post.....

Was hoping for some help on a noise I have on startup.

When I start my truck up, I get a somewhat thumping noise that will last about 20 seconds max then stops instantly. If I drive without letting the noise stop it turns into a tick but stops after a few feet of driving. It will never come back throughout the drive. It doesn't thump all the time, never when hot. The noise matches the revs when accelerating.

I am really tempted to pull the injectors and renew the seals and washers, but I have no solid evidence those are the culprit.

Here is a link to the startup noise and you can hear it stop,
https://youtube.com/shorts/mIzpUjs0Ml4?feature=shared

If i don't let the noise stop, and drive a bit it will turn into a tick, in this video it is hard to hear,
https://youtube.com/shorts/xL946srOG78?si=yd-eMZ7PFr6bd0pY

So, this is my diagnostics so far,
No smoke from exhaust, all plugs are dry, truck has 175,000km, oil level hasn't risen, coolant reservoir has no oil. I have dumped fuel additives with no help, and I run shell diesel and no blowby.

It isn't too concerning as the truck runs fine, feels strong and I don't have any really concerning symptoms only the noises I hear.

I am thinking possibly a burnt valve seal or possibly just injector #5. Could it be #5 warming up?

Maybe a dodgy fuel filter, it is an aftermarket, thought i order Mahle

This one is getting my head scratching.

Any ideas are helpful.... Thank you
Post #1075416 15th Sep 2025 7:19am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5998
2006 Defender 110 Td5 USW Zermatt Silver
Mine does the thumping when cool/cold on startup sometimes. I think it is down to a five cylinder engine but only four glow plugs.
Post #1075454 15th Sep 2025 4:45pm
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kyvlle



Member Since: 22 Jul 2016
Location: Essex
Posts: 76
United Kingdom 2004 Defender 110 Td5 XS CSW Epsom Green
Mine does the thumping noise when it's cold too.
Post #1075483 15th Sep 2025 9:47pm
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DefenderCan



Member Since: 25 Nov 2023
Location: Canada
Posts: 7
 2006 Defender 110 Td5 CSW Alpine White
Thank you for your responses!
Post #1075507 16th Sep 2025 9:55am
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