EP3 can't find source of rattle/knock

EP3 can't find source of rattle/knock

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Discussion

c7aig

Original Poster:

13 posts

171 months

Wednesday 23rd October 2013
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Hi all,

I have a strange metallic rattle/knock and I can't find the source of it, its almost of hollow sort of noise that happens with the slightest bump and the biggest bump, its really only noticable with the window open, the best way to descipe it is like driving over a loose drain...

I've done the drop links and the heat shield. I found a strut infront of the radiator which had rusted off at the bottem so I drilled and bolted that (really thought that would be the source but it wasn't!) still no luck.
I've been under the car and tapped everything I can but still can't locate it.

Any ideas?

Craig

Martin_Hx

3,978 posts

204 months

Wednesday 23rd October 2013
quotequote all
I've heard many people mention the heat shield can rattle on the exhaust ?

People seem to just take it off, although i've never had a problem with mine

c7aig

Original Poster:

13 posts

171 months

Wednesday 23rd October 2013
quotequote all
Martin_Hx said:
I've heard many people mention the heat shield can rattle on the exhaust ?

People seem to just take it off, although i've never had a problem with mine
I actually had a rattle on the heat shield around the drive shaft which I resolved, although I didn't remove it, I could remove it just to rule it out.
I tapped all of the heat shields around the exhaust and nothing moved or made a noise.

From the sound, I would guess the source of the rattle is heavier than a heat shield, it doesn't sound 'tinny' at all.


Martin_Hx

3,978 posts

204 months

Wednesday 23rd October 2013
quotequote all
Very weird ! Don't really think i can help you im afraid, other than try posting on a CTR owners forum. Im sure your not the first to have had this happen !

c7aig

Original Poster:

13 posts

171 months

Wednesday 23rd October 2013
quotequote all
Martin_Hx said:
Very weird ! Don't really think i can help you im afraid, other than try posting on a CTR owners forum. Im sure your not the first to have had this happen !
ok, thanks for your replies.

Mastodon2

13,889 posts

171 months

Thursday 24th October 2013
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Remove the driveshaft heat shield next time you get a chance. If that is not the source of the rattle, you can be sure it will rattle again at some point in the future. It's not even necessary, iirc it was suggested that it was fitted to protect the passenger side drive shaft during the big mileage testing during the cars development, but it's not necessary for road use, there isn't one of the driver's side either.

Wheeler88

36 posts

145 months

Monday 28th October 2013
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I know it sounds really simple but I found my space saver wheel was not sat right in the boot and was making a 'metal on metal' type knocking sound over bumps... It was doing my head in banghead

I could hear it with and without the window being open and sounded a lot louder than I would have thought. May be worth a check?!

c7aig

Original Poster:

13 posts

171 months

Monday 28th October 2013
quotequote all
Thanks for the responses, I'll get that heatshield off and see what changes.

Didn't even give the spare wheel a thought, well worth a look though.

Thanks

Craig

Wheeler88

36 posts

145 months

Monday 28th October 2013
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Another one to try is one I have been trying to locate for the past week...and have finally found it. Get into your back seats and where you have the plastic bit on the seat belt, tap that against the side under the window.

Due to the lack of sound proofing, when it bangs it creates a metallic knocking sound. And due to its location and the way it hangs, it practically sits on the plastic banging all the time.

Quick fix, small self adhesive foam pads on the side of the seatbelt buckle thumbup

itsnotarace

4,685 posts

215 months

Tuesday 29th October 2013
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The cam cover is also a common cause of this, assuming you have removed the driveshaft heatshield and it still occurs. A couple of washers underneath can help

mfnick

69 posts

148 months

Tuesday 29th October 2013
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I had a rattle at lower revs on mine, turned out to be the CAT shield.
But I also got another rattle which wasn't as tinny like you say yours is which ended up being a collapsed back box. I know you said you'd checked the exhaust but maybe worth another look?

Mr2Mike

20,143 posts

261 months

Saturday 2nd November 2013
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The steering rack is a primary culprit for this kind of rattling/knocking. The bush (and the rack housing itself) in the the sliding assembly that the inner track rod ends screw into can wear and allow the assembly to pivot up and down slightly. Try jacking the car up on one side and manually applying pressure to the wheel at 9 o-clock and 3 o-clock positions whilst watching the rack, if it's worn you will see it moving up and down.

The heatshields tend to make a much harsher, higher frequency vibration rather than the hollow knock you get from suspension components.

Layacable

815 posts

214 months

Sunday 3rd November 2013
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Engine mount.?