ADD Posted March 20, 2006 Share Posted March 20, 2006 morning all, i dont know if im just being paranoid or whether this is normal but within the note of my exhaust (nur spec/full decat) there seems to be a knocking noise. you cant hear it in the engine bay though. it is worse when the car is cold but still apparent when its hot. any ideas? should i worry or not? cheers Link to comment Share on other sites More sharing options...
Suprasteve Posted March 20, 2006 Share Posted March 20, 2006 got more info on the noise. does it do it when stationary or only when moving ? I have the same exhurst but haven't noticed any knocking noises. Link to comment Share on other sites More sharing options...
ADD Posted March 20, 2006 Author Share Posted March 20, 2006 its only when stationary mate, but when you rev over 1500rpm it clears. sounds like......um.....a knocking noise, its very hard to describe! Link to comment Share on other sites More sharing options...
Suprasteve Posted March 22, 2006 Share Posted March 22, 2006 dunno mate sorry. Lumpy idle shaking the engine slighty ? Link to comment Share on other sites More sharing options...
wkdtime Posted March 22, 2006 Share Posted March 22, 2006 Does it sound like a very slight popping noise from the exhaust? can it be felt in the car? Link to comment Share on other sites More sharing options...
ADD Posted March 22, 2006 Author Share Posted March 22, 2006 def not a popping noise and yes it can be heard in the car! but no higher than 1500rpm Link to comment Share on other sites More sharing options...
ellis Posted March 22, 2006 Share Posted March 22, 2006 How old is the zorst? If its an old one it could be the baffles going - my old Zigen (on the NA) started with a small rattle - only at idle - but grew into a death rattle after a month or so! Link to comment Share on other sites More sharing options...
ADD Posted March 22, 2006 Author Share Posted March 22, 2006 its only 4 months old, hope its not going already Link to comment Share on other sites More sharing options...
ellis Posted March 22, 2006 Share Posted March 22, 2006 Have you tried wobbling the exhaust when the engine's off to see if there's anything loose inside? Link to comment Share on other sites More sharing options...
ADD Posted March 22, 2006 Author Share Posted March 22, 2006 just tried and nothing is lose at all. it sound more engine like.... Link to comment Share on other sites More sharing options...
wkdtime Posted March 22, 2006 Share Posted March 22, 2006 TBH all i can put it to is that the idle is slightly lumpy, spark plugs? Do you feel the knock when sitting in the car? not hear it but actually feel it so to speak? Link to comment Share on other sites More sharing options...
supragold Posted March 22, 2006 Share Posted March 22, 2006 I have had the same zorst for 2 1/2 years but never heard a knocking noise. Is it touching the underside of the car somewhere? Link to comment Share on other sites More sharing options...
ADD Posted March 22, 2006 Author Share Posted March 22, 2006 not knocking on anything under the car and you cant actually feel it when sat down.....never mind but thanks for all your help guys Link to comment Share on other sites More sharing options...
ADD Posted April 25, 2006 Author Share Posted April 25, 2006 sorry to bring this matter back up but the note sounds like a "pulsing" noise, is that good or bad? Link to comment Share on other sites More sharing options...
pistonbroke Posted April 25, 2006 Share Posted April 25, 2006 aahhhh, pulsing noise. Like the pulsing noise a scooby makes on idle but not so pronounced? Link to comment Share on other sites More sharing options...
Suprash Posted April 25, 2006 Share Posted April 25, 2006 aahhhh, pulsing noise. Like the pulsing noise a scooby makes on idle but not so pronounced? Oh no, it dont wanna be that pulsing noise, that'll mean its the classic one of your Pistons are Broke.......... Link to comment Share on other sites More sharing options...
pistonbroke Posted April 25, 2006 Share Posted April 25, 2006 Oh no, it dont wanna be that pulsing noise, that'll mean its the classic one of your Pistons are Broke.......... Are you being serious, if so, I've never heard of any classic broken piston noise (and my car makes a slight pulsing on idle, I always thought it was down to the shape of the manifold.) EDIT - Does this have something to do with my name?, if so, you'll have to forgive me, I'm blond, its an affliction that has not yet been recognised by the medical profession. Link to comment Share on other sites More sharing options...
Suprash Posted April 26, 2006 Share Posted April 26, 2006 Are you being serious, if so, I've never heard of any classic broken piston noise Nor have I in the 4 years I been on this board Your forgiven................Im just on a wind up, it was supposed to believable to him not you, you was supposed to realise straight away this was a stich up what with your own name appearing in that......... Link to comment Share on other sites More sharing options...
pistonbroke Posted April 26, 2006 Share Posted April 26, 2006 Someone delete this thread before anymore people see how slow I've been. In my defence, its now 0210hrs, and I'm half asleep. Link to comment Share on other sites More sharing options...
ADD Posted April 28, 2006 Author Share Posted April 28, 2006 Nor have I in the 4 years I been on this board Your forgiven................Im just on a wind up, it was supposed to believable to him not you, you was supposed to realise straight away this was a stich up what with your own name appearing in that......... bastard, i was crapping myself then.....i presume its normal then.... Link to comment Share on other sites More sharing options...
pistonbroke Posted April 28, 2006 Share Posted April 28, 2006 Yeah, the slight pulsing is created by slightly different length maniflold pipes coming from the engine. Aftermarket exhaust exagerate this noise. Listen to a Impreza on idle, it almost sounds like it missfiring due to the same effect. Link to comment Share on other sites More sharing options...
ADD Posted April 29, 2006 Author Share Posted April 29, 2006 ok sweet, thought the car was screwed or something. thank you both for your help Link to comment Share on other sites More sharing options...
Suprash Posted May 2, 2006 Share Posted May 2, 2006 I apologies for trying to be funny..... Link to comment Share on other sites More sharing options...
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