Please can you have a listen to this on YouTube it's the knocking noise my impreza makes, it is comin from the drivers side of the engine. When the car is cold there is no noise but as it warms up it appears and this is when it is at its loudest. Does any have any ideas what it is?

Many thanks
Kev

 

big end knock

 

It sounds like it is coming from the heads

 

Hard to hear on the vid, could be a number of things, tappet broken piston ring, small end bearing, big end bearing ect dont sound good what ever it is, hope its nothing too serious though.

 

Always difficult to tell from a video, but that sounds like big ends to me.

 

How can I tell if it is big ends

 

It did just come when I finished doing the clutch was not there befor
Thanks Kev

 

Exhaust gasket.

Did you uses new ones after doing the clutch?
Turbo to downpipe?

 

Can you get over swindon way at all? Im busy over the weekend but. Might be able to have a look if you can!

 

I doubt very much its big ends as the noise is there as you rev as well as when the engine slows.

Usually if its big ends rev to 3kish rpm and let off it will knock as the engine slows.

Thats more a put put put sound.

 

Knock

 

Any exhaust fumes coming out of the oil dip stick when you pull it out?
They are often there when the bottom end goes

I also had a water pump go on me about 10 years ago on an STI and boy did it sound like engine gone.

Sounds a bit more top end to me. But hard to tell from the vid.

Good luck with it

 

It's hard to here on a video. Did they remove downpipe from turbo when fitting clutch? If so it could be leaking if they used old gasket or not tightened nuts properly. Its hard to feel around the turbo because it's hot but try to feel for leaks or nip up nuts.might be worse when warm where metals expand

 

Sounds like a really bad boost leak to me! I'd check vacume hoses )

 

its a pulsing sound, like the exhaust to me.

knock is a bit faster

 

99.9% big end knock, ive heard a few! the reason why it sounds like its coming from the head is that the piston on the failed big end starts hitting the head.

 

Fair enough! you probably know more than me bud. im fairly new to imprezas.

just a coincidence that its happened after a clutch change where you have to take the down-pipe off.

 

I'm gonna say exhaust gasket too tbh, and the fact it coincides with the clutch change...

 

I was told mine was big end bearing as well and it turned out to be the inlet cam gear fooked. This doesn't sound like mine but don't go forking out big money for what could be a silly fault IMO

 

Drop the oil into a clean container (though a cloth) and check for debris, once it's drained you can 'swab' the bottom on the sump through the drain hole also. If it is big end it's obvious from all the swarf.

 

Does sound like a exhaust leak or something not done up correctly. You can drop the oil and look for metal pieces that used to be the big ends to check.

 

Hi guys I just thought I would tell you that it was a loose spark plug thanks for all of your input thanks Kev

 

I said it sounded like exhaust pulses!

99.9% knock eh!

 

Well done for finding problem! Had you changed them recently and not tightened it or had it somehow worked itself loose?

 

Thats great news, didn't half sound like big end to me, phew.

 

Could be your Manifold Gasket or Exaust gasket.

Mine sounded like that when my Manifold Gasket was blowing, becareful not to burn your hand while checking though

 

He already found the problem