View Full Version : Sounds like induction roar at about 4k revs but dies after?!
Patrick_g46
04-11-2009, 20:57
Basically my exhaust backbox has been gone for a while and was quiet loud, the other day I stalled the car after trying to go from reverse to first too quickly, and ever since then when I bring the car up to 4k revs it sounds mental! Really loud, like a roaring noise, this only last for about 6-700revs then car sounds normal again.
It does it even more if the car is under load, like if i have it in a high gear at low speeds and floor it.
I firstly thought it was the exhaust finally given up, but its starting to sound like its coming from the back of the engine bay/exhaust manifold area!
I have had a look and cant see/feel any leaks etc, anyone got any ideas?
Patrick
diathermy
04-11-2009, 22:20
Could be the exhaust gasket.
My car made a really loud raspy noise after 4k.
Changed that gasket and it was better.
Got one cheap off ebay for 5 pounds.
On here, some people say could be a cracked manifold. you will have to take it off to examine it thoroughly.
Patrick_g46
04-11-2009, 23:26
Could be the exhaust gasket.
My car made a really loud raspy noise after 4k.
Changed that gasket and it was better.
Got one cheap off ebay for 5 pounds.
On here, some people say could be a cracked manifold. you will have to take it off to examine it thoroughly.
Which gasket are you talking about? The fire ring?
katbloke
05-11-2009, 10:32
the fire ring is the only gaskey after the manifold before the cat, the downpipe has no gasket between it and the cat afaik
raviedavie
05-11-2009, 12:14
Have you still got the cat on it ? if so maybe its crumbled inside ? happened to me with similar symptoms
Patrick_g46
05-11-2009, 15:25
Nope I have no cat, i had a pipe welded stagith onto the downpipe just after the lamda and straight through to the U-bend before the backbox, the only box/silencer on the system is the backbox.
I just cant help but think the sound is coming from manifold area, although sometimes sounds can be decieving!
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