ive got a deep knock coming from the middle of my engine on my my00, its only there when its hot and its only on tickover, it goes away when i rev it or drive it. its been there for a while now but it hasnt got any worse. the knocking isnt a constant knocking it seems to change rythem

 

how long is "a while"??

if its big ends then you would expect them to give up very quickly and be conclusive that they have failed, certainly within a few days of driving and noticing the noise

alyn

 

Grab a big flat head screwdriver and use it like a stethascope to determine if the noise is actually eminating from inside the crank case and where abouts.

 

its been knocking for a good few months now, its also running 310.5 bhp, it got remapped a few weeks back so its been given a bit of death and the knocking hasnt changed at all.

 

i,ll give it a go mate, thanks

 

Thats not big ends. you will hear them get worse as the revs increase - on my own car it was hardly discernable at tickover but at 2K RPM sounded like a tractor.

 

cheerz mate, im glad about that then i wonder what it could be tho

 

Could be one of the manifolds (sorry headers ) Blowing. That will sound like a thuding noise at idle and you wont really notice it when the revs increase.

If you've got a heat shield on your turbo whip it off and look for signs of exhaust gasses (black dust residue) on the inside, this will identify a leak at the join with the turbo.. Otherwise get under neath and have a good listen.

 

Could it be your cambelt tensioner????

 

Water pump on its way out?

When mine went I noticed it knocking at idle and the knocking got lost with other noise as revs increased. when diagnosed I was advised not to drive the car in case it failed and threw the cambelt.

Its not a 'deep' knock but a knock nonetheless - not a tappety or injector tick anyway.

HTH

 

cheerz for your replies. its definatly not the exhaust blowing or anythin like that and i dont think its the cambelt tensioner or water pump knocking. there is a couple of subaru specialists by me i,ll take it down and see what they say. thanks again

 

fingers crossed its nothing serious james..........

 

cheerz martin