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[gsxr phonix]

omega v6 2.5 99 ok now iknow this might be staight forward but i need clues !!! exhaust blowing cant find it !!!! ok start the engine loud blowing noise but will quiet down when warm loud when u gas it !!!now i had the clutch gearbox replaced last yr and it has started since then so i know the o\s down pipe was removed !!!is there any tricks of the trade that will point to manifold or is it very certain it cracked !!!!is there anything else that could cause this carnt see any black sut just noise HELP !!! ha many thanks steve....  

[Dazzler]

Does sound like a classic manifold blow to me, it is a hard one to pin point.
If you have checked the downpipe joint and that is fine then it is more than likely the manifold.
It may be be cracked it might just be the gasket.

[gsxr phonix]

ive had the engine running and tried to hold and block tailpipe but pressure is to great ... but i did hear a hissing sound !!!! arrrrrr i dont want get rid ha ha   does this stll point to manifold

[Dazzler]

Try 2 of you looking, one can block off with a piece of rag in the hand but only briefly whilst the other listens for the blow.

[gsxr phonix]

ok many thanks !!

[philhoward]

Either that, be quick from a cold start and start feeling with your hand - you'll only get 15-20 seconds before you get burnt though...

It does sound like a cracked manifold though as they tend to disappear when its warmed up..

[gsxr phonix]

if a cracked manifold closes with heat how come it sounds like a tank when i accelarate but when idle you carnt even hear the engine !! (ok a little bit ha) and to br honest it dont go away anymore hmmmmm

[philhoward]

It never goes away completely - just when you give it some beans, the amount of gasses overcome the closing up of the gap.

[gsxr phonix]

are right got ya !pressure ! yeh it never goes under gas ! right time for the tool box many thanks guys

[meridiansi]

Hi,
a plastic pipe broke in my meggy and made the noise I think you're describing only a few minutes from start (when cold).

It's located by the right of the engine as you look at it from the front near the radiator in front of the battery. Tomorrow i can post a photo if you need.

It's black and could be worth a look if it's that as this was absolutely cheaper than manifolds that the mechanic (Official Opel mechanic) said was broken.

Regards,
Raśl.

[meridiansi]

Hi,
photo 'stolen' from http://www.vauxhallownersnetwork.co.uk/showthread.php?t=178891
Thank you.



Hope it helps.
Regards,
Raśl.