99 206 XS - Engine knock

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tom - 17 Jan 2007 22:26 GMT

Hi

Got a 99 206 XS and its running fine but... The engine has started to
make an odd knocking type noise that you can only really hear on idle as
as soon as you start to move off the road noise drowns it out. It makes
no difference if the clutch is depressed or not so its not the gearbox
and it also increases in 'speed' if you blip the throttle. There is no
smoke on overrun and and no loss of power etc. It has not really got any
worse since it started about 600 miles ago but i want to find out what
it is. Oil levels are fine etc.

Any ideas on this one as i am stumped - If i were to guess to me it
sounds a bit cammy but as i said thats a guess.

Any ideas?

thanks

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Chris - 18 Jan 2007 15:26 GMT

> Hi
>
[quoted text clipped - 13 lines]
>
> thanks

bottom end knock Hayes says....Knocking or thumping noise ..Worn big end
bearings.(regular heavy knocking, perhaps less under load.)Worn main
bearings (rumbling and knocking, perhaps worsening under load) Piston
slap,(most noticeable when cold)Ancillary component fault(coolant
pump.alternator.etc...hope this helps in some way.chris addlestone surrey

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tom - 18 Jan 2007 21:41 GMT

> bottom end knock Hayes says....Knocking or thumping noise ..Worn big end
> bearings.(regular heavy knocking, perhaps less under load.)Worn main
> bearings (rumbling and knocking, perhaps worsening under load) Piston
> slap,(most noticeable when cold)Ancillary component fault(coolant
> pump.alternator.etc...hope this helps in some way.chris addlestone surrey

thanks for the tip - car has only done 67k so i would not expect
something major like a bottom end going so i hope is not that!! Would
the water pump possibly make a noise like that? It has pas and air con
too so i guess it could be any of those....

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Chris - 19 Jan 2007 17:30 GMT

>> bottom end knock Hayes says....Knocking or thumping noise ..Worn big
>> end bearings.(regular heavy knocking, perhaps less under load.)Worn
[quoted text clipped - 7 lines]
> the water pump possibly make a noise like that? It has pas and air con
> too so i guess it could be any of those....

has the car been hamered?lots of motor way driving also the last person
might of let the oil go down low, which dos not help.

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Odster - 20 Feb 2007 07:26 GMT

If it’s diesel it could be an injector on it’s way out

Ke

> tom wrote:
> >
[quoted text clipped - 19 lines]
> last person
> might of let the oil go down low, which dos not help.

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tom - 21 Feb 2007 11:39 GMT

> If it’s diesel it could be an injector on it’s way out

thanks its a 1.6 petrol

its now solved however and turned out to be a loose spark plug! I guess
th blow-by was causing the sound that was exactly like a major bottom
end woe!

mechanic could not diagnose it but in the end after lots of tinkering i
figured it out.

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markmtbanks - 20 Feb 2007 18:54 GMT

>Hi
>
[quoted text clipped - 13 lines]
>
>thanks

Seen a few of these before..we brought out a modified crankpulley to help out.
.but guess what?.. it made no difference at all!...The problem is usually
worn main bearings ...... regards mark

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