Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: coastie123 on 12 April 2010, 14:55:40
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Hi again!!!
I now have a small noticeable sucking noise from the rear of plenum which is only noticeable when the bonnets up an the engine running....
Some more help....pretty pretty please!!!
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push down on the plenum at the back, does it stop?
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Will check in a min and get back to you!!!
Could this be linked to a small whine/whistle which I reported the other day???
Back in 5!!!!
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Is it all the time, or worse if revving slightly? If all time, check vac pipes around back (and to rear multiram), and check main vav hose hasn't worn through on a/c pipe
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push down on the plenum at the back, does it stop?
the answer is no!!!
It does do it all the time... I though it was a belt whiring round first but after listening it's definately to the rear of the plenum.....
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push down on the plenum at the back, does it stop?
the answer is no!!!
It does do it all the time... I though it was a belt whiring round first but after listening it's definately to the rear of the plenum.....
Check vac pipes ;)
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Would it pay to remove the plenum and check around or is it more than it's worth
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Would it pay to remove the plenum and check around or is it more than it's worth
Not at this stage, just follow all vac pipes, ensure connected. Ensure that the t pieces where the small vacs meet main vac arent broken.
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If all the vac pipes "look" ok .. spray around lightly with carb cleaner while the engine is at idle .... if the engine note suddenly changes you've just found the leak .. the carb cleaner has ben sucked in and used as fuel !!!
Fix problem, wipe down with paper towel .. result ... mended leak and a nice clean engine .. :)
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All pipes and hoses etc checked and cannot see anything untoward... No splits/cracks etc..
Could it be the cambelt whiring round and echoing through?? it does need changing but I cannot get around to it this week as lack of funds....
I do know the cambelt is at the front!!
that prob is a stupid question but was just a thought!!!
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undo the main vac pipe to plenum, 19mill spanner i think, and pull the vac round over plenum so you can see the pass side back edge, the classic fault is for the pipe to Rub through in that area where it chafes on the ac pipe next to it.
If no joy there have a look behind the scuttle panel above pollen filter, you'll see a vac tank above polen filter, the two vac pipes too and from are another favourite, along with the tee pieces mentioned previous.
Probably find the hiss gradually fades out a couple of seconds after engine off, classic vac pipe leak symptom imo.
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Cheers chris...
It does fade out as engine is stopped....
I will strip it down and have another look tomorrow as I'm now at work.... Will keep you updated and hopefully this is the fault and an easy fix.... Where will I get new pipes will I hav to goto vauxhall or will a car shop/parts company have them?
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Cheers chris...
It does fade out as engine is stopped....
I will strip it down and have another look tomorrow as I'm now at work.... Will keep you updated and hopefully this is the fault and an easy fix.... Where will I get new pipes will I hav to goto vauxhall or will a car shop/parts company have them?
initially pipe leaks can be wrapped in insulation tape, just be sure it cant be sucked into the engine.
I'm sure the breakers on here must have plenty of vac tanks and small bore pipes, i'm not suee how to replace the large vac pipe plunum to servo though.
Basically all that system needs checking so follow those small black pipes round the engine bay, the nature of parts waring through means you can be absalutely certain any holes will be hidden from view, unless a connector has snapped off one of the two vac tanks.
Engine running should help locate the hiss, mind fingers obviously.
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You have run over a small pigmy builder who is about to quote you on a job you dont need doing and hence the sucking of air through his teeth.
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All points noted... Once I have located the problem and area I will get an add posted in the parts wanted section and will also take a few pics if I can... All this is if the Mississippi will let me of course!!!!!!
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Just to say Coastie I had problems with Vac system and went to main dealers for parts and finished up at local VX scrappers and came away with lots of tubeing, rubber elbows,plastic T pieces, for next to nowt, the very same parts are used on all Vx models in profusion.Hope this info helps :y
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You have run over a small pigmy builder who is about to quote you on a job you dont need doing and hence the sucking of air through his teeth.
oooh, genna cost ya guv... :)
how does the vac pipe to servo come off mark?
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You have run over a small pigmy builder who is about to quote you on a job you dont need doing and hence the sucking of air through his teeth.
if only that were true!!!! :y
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Hi guys just finished work...
On the way home I thought I would listen out for this sucking noise as the roads were quiet!!!
I coul hear it in the cab when I added a bit of right foot.... Well a bit more than a bit!!!
Will be having a good look round in morning but if anyone could shed some more light on way it could be apart from the vac pipes etc so I have some more things to look over - it would be greatful!!!
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The common issue I see on these is where the brake servo pipe has rubbed against the aircon pipe and created a hole (rear right of the plenum).....this is due to poor re-fit as there should be a bracket that spaces the two pipes apart.
Brake servo pipe just has a 19mm nut attaaching it to the plenum (counter hold teh plenum section wiht a 17mm and simply pushes into the servo.
The secret to removing the pipe from the servo is to wiggle it and hold it at a bit of an angle so the air can enter the servo around the rubber pipe fitting seal....once this is done it comes out easily.
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The common issue I see on these is where the brake servo pipe has rubbed against the aircon pipe and created a hole (rear right of the plenum).....this is due to poor re-fit as there should be a bracket that spaces the two pipes apart.
Brake servo pipe just has a 19mm nut attaaching it to the plenum (counter hold teh plenum section wiht a 17mm and simply pushes into the servo.
The secret to removing the pipe from the servo is to wiggle it and hold it at a bit of an angle so the air can enter the servo around the rubber pipe fitting seal....once this is done it comes out easily.
so just a push fit, but held in with vaceume?
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The common issue I see on these is where the brake servo pipe has rubbed against the aircon pipe and created a hole (rear right of the plenum).....this is due to poor re-fit as there should be a bracket that spaces the two pipes apart.
Brake servo pipe just has a 19mm nut attaaching it to the plenum (counter hold teh plenum section wiht a 17mm and simply pushes into the servo.
The secret to removing the pipe from the servo is to wiggle it and hold it at a bit of an angle so the air can enter the servo around the rubber pipe fitting seal....once this is done it comes out easily.
so just a push fit, but held in with vaceume?
Yep...its quite tight once the vac is released but very tight when its present!