Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: immortal on 22 March 2011, 13:52:37
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Im just about to buy a 2.5 V6 Omega Elite that when revved sounds like it has a blowing exhaust.
I've checked the exhaust and its not blowing anywhere. The chap I'm buying it off mentions it might be the pipe that can be taken off as its not really needed that might be blowing??? or it might be the manifold gasket? How likely is it that its either of them? It does feel down on power he says so don't know if thats a clue to the cause?
Cheers
Matt
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It sounds like either the exhaust or exhaust manifold IS blowing ::)
........and a pipe that isn't needed could be the cause? What is that all about?
Unless you can get the miggy for a very good price, or at least factor in the cost of a new exhaust / replacement manifold gasket, I personally would walk away! ;) ;)
Wouldn't trust the seller from what you are saying. He MUST know really what is up! ::) ::)
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Hi,
Well its an X Reg elite (newer shape) with cream leather and 114k miles , with 11 months MOT and 5 months tax for £390. Body in very good nick. Its definitely 100% not blowing on the exhaust as its been up on a ramp with the local kwikfit and they said definitely not blowing on the exhaust and maybe manifold or this pipe?
What do you think?
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Hiya, that does seem very cheap if the rest of the car is in good nick. But you will need to factor in the cost of new exhaust/manifold possibly. Its the owners ignorance of the problem that would put me off tbh
:(
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Im thinking SAI, sure these have been known to blow, often caused by a partially blocked exhaust system
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Hi,
Well its an X Reg elite (newer shape) with cream leather and 114k miles , with 11 months MOT and 5 months tax for £390. Body in very good nick
What do you think?
Well that is a realistic price, but as said you should factor in a new exhaust and/or exhaust mainfold gasket. Dependant on Service History (proved) also factor in a cam belt change, £400 just for that alone if you cannot do it yourself, plus possible cam gasket change and breather clean.
There are specialist mechanics on here who can do it all for a good price, but it is safer to think the £390 is not the only cost. With a miggy (Omega) it is so often not!
But once again £390 is a good price, and if you can do your own mechanics then it shouldn't be too much of a problem or cost :D :D ;)
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Im thinking SAI, sure these have been known to blow, often caused by a partially blocked exhaust system
Would the SAI pipe cause it to lose power and sound like a real bad blow on the exhaust though? Is it the little 4" rubber pipe thats the problem on the long metal piece or the long metal piece?
Matt
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Matt - if you post up your location, there may be someone nearby who could have a look with you.
For what your paying for the car, it sounds like it will be a good buy, as long as you have budgeted another few hundred to spend on it after youve bought it. :y
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I stupidly changed my drivers side exhaust manifold which I thought was blowing. It turned out to be the SAI pipe. The SAI pipe took ten mins to change.
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I stupidly changed my drivers side exhaust manifold which I thought was blowing. It turned out to be the SAI pipe. The SAI pipe took ten mins to change.
Hi,
Was it the little rubber bit or the whole metal pipe?
Matt
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I stupidly changed my drivers side exhaust manifold which I thought was blowing. It turned out to be the SAI pipe. The SAI pipe took ten mins to change.
Hi,
Was it the little rubber bit or the whole metal pipe?
Matt
Its normally the little rubber pipe
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Ok cheers. Ive heard you can just blank them off and have done? If so would it cause any issues by doing that? If all is ok how do i do it?
Matt
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Ive just been googling and apparantly you can take the rubber pipe off one end and put a screw in the end to blank it off. Is this safe?
Matt
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Could be the EGR
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Worst case scenario is that you have a blocked catalytic converter and back pressure is forcing its way past the non return valve in one of the stainless steel pipes. Hot exhaust gas will burn through the rubber pipe very quickly.
Alternatively one of the non return valves may be stuck open or the hose may have failed due to age :-/
Being down on power does sound like a blocked cat unfortunately :(
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Ive just been googling and apparantly you can take the rubber pipe off one end and put a screw in the end to blank it off. Is this safe?
Matt
I'm thinking it would be easier to fit a new bit of rubber pipe :-/
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Worst case scenario is that you have a blocked catalytic converter and back pressure is forcing its way past the non return valve in one of the stainless steel pipes. Hot exhaust gas will burn through the rubber pipe very quickly.
Alternatively one of the non return valves may be stuck open or the hose may have failed due to age :-/
Being down on power does sound like a blocked cat unfortunately :(
And im guessing a blocked cat is alot of money?
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The cats on my last Omega were still fine when it was scrapped at over 200,000 miles.
I think new ones are silly money but you shouldn't have any worries about getting a good second hand pair. Have a look in the For Sale section.
The main problem is that they are worth good money for scrap.
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Excuse the impertinence, and irrelevance if I'm being daft...
...but isn't a blockage in an Omega exhaust far more likely to be the horsehair-stuffed rear box than cat(s)?
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Being down on power does sound like a blocked cat unfortunately :([/quote]
And im guessing a blocked cat is alot of money?
[/quote]
Just asking & for future reference, but I presume the ones I've seen on flea bay, new aftermarket for around £100 a side are to be ignored at all costs ? :-/ :-/ :-/ :-/
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Hi,
After a few days of reading back threads on here and on another forum im getting the feeling that it might be a split pipe between the SAI and the manifold. Do you think this is likely? If so can i not rip all this piping out and block the whole SAI system from working? Could i rip out the egr aswell?
Would it fail mot like this?
Matt
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Would be really grateful if somebody could let me know asap
Matt
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as mentioned, my two penny worth would go with a blocked cat causing the back pressure/low performance leading to the rubber sai pipe burning thro. after market prices are not too mad.
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I know the SAI kicks in for the first few mins on starting from cold to put more air into the manifold yes? When i start the car from cold and put my hand down in the area where the SAI is i can feel alot of air , almost a breeze , is that normal? if not is that going to be the problem?
(http://i51.tinypic.com/33bd2fo.jpg)
And it feels like its coming from behind this black cover (i thought was cam cover?)
(http://i53.tinypic.com/9axx1t.jpg)
Matt
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***Update***
Just to update you all i changed the SAI rubber pipe and its fixed it. Its still a little raspy but it is a V6 after all and its nowhere near as loud as before.The previous pipe had a big split in it and a hole at one end. I put the new pipe on (the genuine vauxhall pipe is twice as thick as the original one so i guess someone scrimped on it) and its no longer raspy. The SAI valve is still very noisy when it first kicks in but no longer the blow.
How would i disable the SAI pump?
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the pipe will probaly burn through again, like mine did, only it might take a little longer. the faint rasp might be the start of it.
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the pipe will probaly burn through again, like mine did, only it might take a little longer. the faint rasp might be the start of it.
So to prevent this happening ive got to find the block in the exhaust? If so is there a better way to find out which part without just replacing each part blindly?
Matt
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I didn't, although I don't think I had a blocked exhaust, the power certainly isn't down! 8-)
I bridged the rubber section with copper, it' been fine ever since, no noise and no heat or anything getting up to SAI pump.
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I didn't, although I don't think I had a blocked exhaust, the power certainly isn't down! 8-)
I bridged the rubber section with copper, it' been fine ever since, no noise and no heat or anything getting up to SAI pump.
How did you do the copper? Did you just find a piece same diameter and then weld it to it?
Matt
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I didn't, although I don't think I had a blocked exhaust, the power certainly isn't down! 8-)
I bridged the rubber section with copper, it' been fine ever since, no noise and no heat or anything getting up to SAI pump.
How did you do the copper? Did you just find a piece same diameter and then weld it to it?
Matt
I bought a flexi section on trade at BnQ, which was for all intents and purposes was the same diameter, and used compression fittings. My heart sank when after changing the exhaust manifold gasket, all appeared ok, then it started blowing. I was lifted somewhat when I did this!
When i say flexi, I mean flexi to a degree, not floppy