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JCERB

Rear thudding sound over bumps

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Hi All,

Hope you're all well. I think for as long as I've had the car over some bumps, there is a thud. Sounds like the boot floor as when you lightly "punch" it there is vibration, and I wonder if it's this? How on earth do you remove/check fixings? The carpet is obviously first obstacle. Battery is fixed properly too. Nothing else seems loose.

Cheers!

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Upgrade today to remove Google ads and support TLF.

After my car was serviced, the gear cables were not aligned properly, sounded awful everytime I accelerated, sounded like something was loose, banging around, sounded awful.

Took the car back to the lotus dealer, car back up on the ramp and I ensured everything was put back properly.

This may not be your problem but that was what was causing my thudding noises.

 

Hope this helps.

 

 

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Interesting, was your gear change bad? Mine is only over bumps (bigger harsher ones)

I may have figured mine out this afternoon. The heat shield above the exhaust seemed to be the culprit in my case, where it meets the boot. Wedged an angled piece of polyurethane in there, shaped so it can't come out. Driving it will be the real test, however when I thump the floor it seems to have gone! Took ages to find what would work and locate the noise. The floor is directly riveted to the secondary heat shield which doesn't make it easy!

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Check the rear upper mounts for the shock absorbers. I had the bolt loosen and finally throw the nut and slip out of place.  Its all in a cage, which means that if it did move you can't remove it.

IMG_20180625_171056 (Mittel).jpg

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If you have the choice between a Stairway to Heaven and a Highway to Hell don't forget the Nomex®!

Captain,  Lotus Airways. We fly lower! 

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Oh dear, thanks for that. Do you mean on the rear? How easy is that to check? Not taken this car to pieces before, as have tried not to, from all the other ones I have! Cheers

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Just manage to inspect through the wheel with an inspection mirror using a very bright torch, they all look to be tight. The tamper paint is still intact on all the bolts that hold the brackets in, and nothing looks to have moved. Obviously without dropping the shock, I can't see the top bolt. Hopefully it's ok, but thanks for that.

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On 21/04/2020 at 16:48, JCERB said:

Just manage to inspect through the wheel with an inspection mirror using a very bright torch, they all look to be tight. The tamper paint is still intact on all the bolts that hold the brackets in, and nothing looks to have moved. Obviously without dropping the shock, I can't see the top bolt. Hopefully it's ok, but thanks for that.

Yes, the rears.

Unfortunately I wasn't able to see it either. In fact, I had the car up 3 or 4 times before we found it. It was only upon removal, when we couldn't pull the shock that we realised the bolt was blocking it.


If you have the choice between a Stairway to Heaven and a Highway to Hell don't forget the Nomex®!

Captain,  Lotus Airways. We fly lower! 

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Oh dear this sounds like a problem then. Is this common? Never heard of it before. Had your car been tracked? How do bolts just come loose holding a strut in place? Sounds awful if that is happening on these cars! Maybe they were never tight from the factory and skimped on using nylocs?

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Being honest, there are so many things which could cause a knock sound over bumps that it's almost impossible to say what it could be without looking at your car.  So far I've had the following which has caused knocking sounds on the rear:

ARB bushes perished

Droplinks needed replacing

Toe links (replaced with spitfire now)

Damper knocking (not sure exactly why, but a rebuild sorted it)

They're all easy fixes really, any good Lotus specialist will find any issues in minutes.

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Cheers George. Once Back on Track are open again I'll let them have a look at it when they do the service. It think it the heat shield under the boot floor. 

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On 09/05/2020 at 23:52, JCERB said:

Cheers George. Once Back on Track are open again I'll let them have a look at it when they do the service. It think it the heat shield under the boot floor. 

Back on Track are open :)

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Great, thanks! I'll give them a shout.

Edited by Bravo73

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On 30/04/2020 at 16:25, TBD said:

Yes, the rears.

Unfortunately I wasn't able to see it either. In fact, I had the car up 3 or 4 times before we found it. It was only upon removal, when we couldn't pull the shock that we realised the bolt was blocking it.

Thomas, you were certainly right!! Back on Track checked it out and found it was loose. Very odd when it's never been touched as far as I'm aware, that is. So thanks very much for that:thumbup:

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