DangerousDave16v
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Registered: 20th Feb 03
User status: Offline
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Im tryin to track down a nasty metallic rasp which is rev specific (4500rpm) and rekon its comin from the exhaust manifold area.I ve removed the manifold heat sheild and that wasnt the problem. so was wonderin what these parts are
- I think its the egr valve- it seems to originate from the bottom of the manifold and has alot of silver piping,goes into a little metal pot right at the front of the engine bay and then comes out of the pot with a black pipe and ends up in a black sort of cylindrical plastic box, just in front of the battery.
im just goin through all the possible options and checking all possible loose bits that could resonate at 4500rpm
any comments appreciated
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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my bros does this, basically the manifold gasket has gone and it vibrating against the block.
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DangerousDave16v
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Registered: 20th Feb 03
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Ah right,i'll have to inspect it more closely ,dont fancy movin all those pipes and bits to get in there 
cheers kris
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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take a look underneath 
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DangerousDave16v
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Registered: 20th Feb 03
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I would have thought even if the exhaust gasket was cracked or rusted or broken,it would be on so tight that it wouldnt be able to vibrate.
it anoys the poo out of me,but not enough to take the whole exhaust manifold off to see if that is actually the problem!
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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start the engine and listen if its loose
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Fad
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Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
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check ur CAT mine did that when i had a 1.4 16v the CAT was resonating
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DangerousDave16v
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Registered: 20th Feb 03
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Car starts and idles quitely and runs perfectly without any unusual noises upto 4500rpm when it starts to rasp and about 300-400rpm after it stops.
think fadscorsa may be right,could be the cat.i could replace all possible parts which could by doing it by elimination,but that wud cost too much 
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Mossy01772
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Registered: 4th Sep 03
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follow yor exhaust down under the car where the two pipes join into one there is a heat shield there as well these always come loose i have cut mine off, check this.
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Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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as mossy said the heat shield on manifold downpipes rattles
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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i have a ecotec cat f/s
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DangerousDave16v
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Registered: 20th Feb 03
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gesus this is an old post!
i took that heat shield off months ago, and its still rasping, its deffo the cat methinks
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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is there not a heat shield between the cat & the floor pan also?
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DangerousDave16v
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Registered: 20th Feb 03
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Dont think so mate, if there was i wudda ripped the cunt off long ago 
i'll check tho
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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No chance its a manifold - head gasket problem.
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