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Author Subject: Weird noise from engine
sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

Posts: 1,312

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Post #1
Hi all,

noticed the other day the cars started making a weird noise, it increases with the revs of the engine. I have a couple of videos of it which ill post. Typical just as i wanted to sell it.



and this is one of it driving along at about 4K rpm towards the end of the video you can hear the noise disappear as the clutch is dipped





any chance it could be something simple like a loose spark plug or is it going to be something more?

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 2nd Nov 2014 at 18:10
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pete-gti

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Location: Kent

Registered: 15 Feb 2009

Posts: 1,297

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Post #2
Possible loose spark plug Smile
Posted 2nd Nov 2014 at 18:46
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

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Post #3
I'm hoping so! Have ordered a spark plug socket for my socket set so will check it out

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 2nd Nov 2014 at 21:54
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #4
If it stops when you press th clutch then I'd say it was a thrust bearing issue
Posted 2nd Nov 2014 at 22:12
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

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Post #5
Once the revs drop it stops, or at least quietens down massively, seems very influenced by the revs.

I'm not sure what a thrust bearing is, how can I check that?

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 2nd Nov 2014 at 22:14
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armzsc6

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Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #6
Sounds like a bottom end knock in the first video. In the second one could be bottom end or knackered gearbox / diff problem as it goes when you press the clutch and cut the gearbox speed.

However without being there it could still be bottom end knock and it's just quieter on idle when warm so when you dipped the clutch it went quiet but when going Along at 4k it's loud.

________________________________________

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Posted 2nd Nov 2014 at 22:36
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #7
sparkie1984 wrote:
Once the revs drop it stops, or at least quietens down massively, seems very influenced by the revs.

I'm not sure what a thrust bearing is, how can I check that?


Thrust bearing is attached to the clutch pres plate. How old is the clutch ? Mileage on the clutch ?
Posted 2nd Nov 2014 at 22:52
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

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Post #8
I'm not sure about the clutch mileage to be honest, the cars on 145k though.

Bottom end issues doesn't sound good or cheap to fix so Sounds like it might be time for the car to meet its maker.

Thanks for the advice guys

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 3rd Nov 2014 at 06:17
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jamiek_uk2000

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Location: Llanelli

Registered: 18 Apr 2009

Posts: 1,925

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Post #9
It's not too bad doing the bottom end, but easier to just change the engine.

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Posted 3rd Nov 2014 at 09:01
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

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Post #10
To be honest if it's that I think, I'll have to just sell it as it is.

Might be of use to someone for a track car or for bits

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 3rd Nov 2014 at 09:19
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

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Post #11
just check the plugs first, but I wouldn't go running it much and definitely would not drive it as yiu gave s high chance of rendering the whole engine scrap if it is bottom end related.

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Posted 3rd Nov 2014 at 12:43
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

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Post #12
Thanks mate, I'll check the plugs and if it's not that then I'll have to sell it as is.

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 3rd Nov 2014 at 12:49
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sparkie1984

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Location: hertfordshire

Registered: 19 Jan 2008

Posts: 1,312

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Post #13
Well unfortunately my socket set doesn't have a long enough bar to take each plug out.

However the spark plugs are not loose enough to undo by hand (without the ratchet bar on) so I doubt it's a loose spark plug.

________________________________________

built on: 15 January 1999 - that's a Friday afternoon car..eek!!! ;o).........sadly missed
Posted 6th Nov 2014 at 19:30
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