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Author what causes engine knock?
LeeM
Member

Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 14:58   View User's Profile U2U Member Reply With Quote

my saxo has developed a very slight engine knock/rattle on idle when i first start it, seems to stop once engine is warmed up and its so quiet as soon as i rev the engine i cant tell if its still doing it.
what could it be? recently had cambelt changed but cant be sure its definately started since then
AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
22nd Mar 09 at 15:15   View User's Profile U2U Member Reply With Quote

hard to diagnose over the net

Take it to a garage you trust.

Could be something simple like a loose part vibrating (heat shield etc)....

Noisey injectors
'Dry' Hydraulic Lifters
Fecked big end bearings (not normally on idle and you'd hear it under load)


lots of things, immpossible to guess.
LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 15:39   View User's Profile U2U Member Reply With Quote

cheers, didnt think it would be something easy to work out
by the time i get to a garage its usually stopped !
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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22nd Mar 09 at 15:42   View User's Profile U2U Member Reply With Quote

You sure its knocking.. Knocking is caused by worn big end or main bearings and if anything it will get worse when warm and louder when you rev.
LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 15:44   View User's Profile U2U Member Reply With Quote

well a rattle then, it sounds slightly like the noise the engine makes when your about to stall but much fainter
LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 15:45   View User's Profile U2U Member Reply With Quote

if i give the throttle a little blip it goes away for a few seconds then when it gets back to idle it comes back
Slammed_Corsa
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Registered: 30th Oct 05
Location: Greenock, Inverclyde
User status: Offline
22nd Mar 09 at 15:45   View User's Profile U2U Member Reply With Quote

Did you get the water pump changed when you got the belt done. This might be the case as i have seen this knock/click before until the engine heats up.
AK
Member

Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
22nd Mar 09 at 15:46   View User's Profile U2U Member Reply With Quote

top or bottom of engine?

Sounds like hydraulic lifters... but i'm not sure what type of noise a corsa makes when its away to stall :/ PARP, cluck, fart
BarnshaW
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Registered: 25th Oct 06
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22nd Mar 09 at 15:46   View User's Profile U2U Member Reply With Quote

exhaust heat shield rattling? mine used to do the same.

[Edited on 22-03-2009 by BarnshaW]
LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 15:47   View User's Profile U2U Member Reply With Quote

nope didnt change the water pump but that could be a good guess i'll check it out see if its loose! cheers
LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
22nd Mar 09 at 15:48   View User's Profile U2U Member Reply With Quote

sounds like its from the top of the engine although i cant be sure, and it doesnt really sound like any rattling trim although i'll try removing heat shield to see if it goes cheers
DizzyRebel
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Registered: 2nd Jan 09
Location: Lincoln
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22nd Mar 09 at 15:51   View User's Profile U2U Member Reply With Quote

Probably just noisy lifters, untill it starts doing it all the time i shouldnt worry about it too much!
Bonney
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Registered: 14th Nov 04
Location: St Helens
User status: Offline
22nd Mar 09 at 16:17   View User's Profile U2U Member Reply With Quote

On the saxo i had, sometimes when it was cold you would hear a slight tick from the injectors as they are quite noisy on the saxos

 
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