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Omega Help Area => Omega General Help => Topic started by: gsxr phonix on 15 February 2009, 17:20:59

Title: v6 exhaust
Post by: gsxr phonix on 15 February 2009, 17:20:59
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....  
Title: Re: v6 exhaust
Post by: Dazzler on 15 February 2009, 17:27:11
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.
Title: Re: v6 exhaust
Post by: gsxr phonix on 15 February 2009, 17:57:54
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  :P does this stll point to manifold ???
Title: Re: v6 exhaust
Post by: Dazzler on 15 February 2009, 18:14:37
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.
Title: Re: v6 exhaust
Post by: gsxr phonix on 15 February 2009, 18:25:54
ok many thanks !! :D :y
Title: Re: v6 exhaust
Post by: philhoward on 15 February 2009, 19:29:53
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..
Title: Re: v6 exhaust
Post by: gsxr phonix on 15 February 2009, 19:59:24
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 :'(
Title: Re: v6 exhaust
Post by: philhoward on 15 February 2009, 20:02:07
It never goes away completely - just when you give it some beans, the amount of gasses overcome the closing up of the gap.
Title: Re: v6 exhaust
Post by: gsxr phonix on 15 February 2009, 20:08:21
are right got ya !pressure ! yeh it never goes under gas ! right time for the tool box many thanks guys
Title: Re: v6 exhaust
Post by: meridiansi on 16 February 2009, 22:10:04
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.
Title: Re: v6 exhaust
Post by: meridiansi on 17 February 2009, 22:09:07
Hi,
photo 'stolen' from http://www.vauxhallownersnetwork.co.uk/showthread.php?t=178891
Thank you.

(http://www.arrakis.es/~meridiansi/manguitoroto.jpg)

Hope it helps.
Regards,
Raśl.