Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: JK on 27 June 2009, 13:43:56
-
I have bought a 3.0 elite and it was cheap, so i knew there would be faults with the car, i am sorting them out one at a time,and slowly and with the help of the forum getting there, but the problem that i can't seem to get my head around is coming from the engine bay ,i have found the location of the noise and have made it good [or so i thought ],it is a thin stainless pipe that runs along the block , it is connected to another stainless pipe with a small piece of rubber hose, this rubber hose has split and hot fumes from the exhaust is coming out. The fumes are very hot and the more you rev the engine the harder the gasses come out ,it sounds like a compressor, i have changed the pipe but it only cured it for a few miles and it has melted and burst again, i have also noticed that the previous owner has welded a piece of pipe where the rubber was on the other bank,and so, he must have known about this, but alas did not tell me when i bought the car, can anyone tell me the function of this pipe and why mine is getting hotter than a hot piece of hotness that has just come out of the oven [and you don't get much hotter than that] .I would be grateful for any information about this pipe and the canister it goes too, if any one knows about it ,i have been looking through the posts but nothing yet, ghost driver ,a member of the forum came over, but like me can't shed any light on the situation hope someone can help JK :'(
-
Sounds like the 1 way valve has failed in the SAI system, thus allowing hot gases to escape.
The other option is the exhaust is blocked, so exhaust gases finding anyother way out.
-
What is the sai system and what is its function--thanks JK
-
covered lots of times before ;)
-
up to page 72 now and have to start again ,as i was not looking for sai ,thanks JK
-
system to warm up cats quicker, not reqd.
air pump in front of passenger front wheel pumps air in to exhaust via 1 way valve into each exhaust manifold
-
Looking at posts on the search it seems that you can remove a 50 amp fuse to disable it, is this true and if so where is the fuse --thanks JK
-
just had the same on my 3.0 elite i got a secondhand pump for £15 from dave marshall and not the 415 + VAT from main dealer and all works fine now.Took about 30 mins to do the job. as the boy said it,s infront of n/s front wheel by the horn. :y
-
going to have a look now --JK
-
well i have had a better look now that i know what im looking for,and have discovered that the pump is working quietly and stayed on for about a minuet, during this time i felt the pipes [stainless to see what happened and also as the rubber was missing and i could see which way the exhaust fumes were going,it turns out that both stainless pipes were sending out hot exhaust fumes but the rubber pipes directly attached to the pump did not increase in temp,only the ones that run along the engine block itself and also the steel part at the front of the engine,was getting hot quickly, i then went to the back of the car and there was almost no pressure coming out of the rear of the exhaust pipe.I have never had an exhaust pipe on a car that has been blocked internally ,can anyone explain how and why this happens as i now think this might be the cause as THE BOY suggested earlier--JK
-
The exhausts can block when the internals corrode and the "horse hair" type wadding goes everywhere .... on my old miggy this only became apparent after a very loud bang and all this hairy stuff came out of the exhaust pipe !!! New exhaust and suddenly I had a whole lot of performance back as well .. :)
-
will i have to change the cats ?
-
Its not the cats .. its the main boxes .. in my case the rear one .. the cats don't have any "wadding" .. its the silencer boxes that do.. :)
-
The exhausts can block when the internals corrode and the "horse hair" type wadding goes everywhere .... on my old miggy this only became apparent after a very loud bang and all this hairy stuff came out of the exhaust pipe !!! New exhaust and suddenly I had a whole lot of performance back as well .. :)
*strokes chin* I've been pulling bits of horsehair out of my exhaust for the last three days, it's spitting it out in lumps - worth replacing? Will I need just the back box, or the centre section too?
I ran about in an old Micra for a bit, was quite entertaining when I pulled out onto a main road, gave it a bit of throttle, huge bang and the wadding spat out like a cannon...
8-)
-
The exhausts can block when the internals corrode and the "horse hair" type wadding goes everywhere .... on my old miggy this only became apparent after a very loud bang and all this hairy stuff came out of the exhaust pipe !!! New exhaust and suddenly I had a whole lot of performance back as well .. :)
*strokes chin* I've been pulling bits of horsehair out of my exhaust for the last three days, it's spitting it out in lumps - worth replacing? Will I need just the back box, or the centre section too?
I ran about in an old Micra for a bit, was quite entertaining when I pulled out onto a main road, gave it a bit of throttle, huge bang and the wadding spat out like a cannon...
8-)
When I changed mine I went for a complete "cats back" ... as IMHO if one part of the system is that badly worn out.. the rest is probably about to follow it :)
Luckily the new miggy had a stainless system already on it ... :)
-
Right, some people may have lead you down wrong path about it being the pump. Its not.
Your issue is the rubber pipe between pump and 1 way valve softening and blowing?
If yes, thats either a fault in 1 way valve (in which case remove all SAI stuff, and block up the holes in manifold), or blocked exhausts (particularly if its blowing the short (3") rubber pipes).
-
It is the short 3 inch rubber pipes that keep blowing ,well spotted my friend, it is just the 3 inch ,all the others are fine---JK
-
I have removed the rear silencer and the results were drivers side exhaust is doing what an exhaust should do, however the passenger side has only a small amount of pressure coming out, i then moved under the car, feeling the exhaust for temp ,after 10 min's the drivers side was well hot as expected but the passenger side was only slightly warm ,even the cat was comfortable to the touch ,the other side by this time was untouchable as it should be, any more help would be appreciated--JK
-
Blocked exhaust then
-
Hope so, but the centre parts of the exhausts look quite new, i was thinking more in the lines of a blocked cat, if it is, any idea how this can happen, and is there a cleaning proses or is it a new cat---JK,--------- just read on the internet that you cannot clean a cat ,but you can punch a hole through it ,this will obviously clear the blockage ,give more power and will make it sound a bit more throatier,however it is not good for the emissions,anyone ave any thoughts on this matter---JK
-
Found out what was causing the car to run well at tick over but it would not pull cleanly through the rev range, it also blew the three inch bit of hose on the asi unit, it was all down to a blocked cat , i know this now as when all the pipes were removed and only the down pipes were connected to the manifold, there was still hardly any exhaust gasses coming out of one side ,well i removed that as well , and when it had cooled i tried to blow through it and it was hard, so as it was knackered anyway ,i took my 9 inch grinder and opened it up for a look ,i found about 12 pieces of cat about marble size, and the rest looked like grey damp clay,i took all of the cat stuff out ,and re welded the exhaust , put it back on and it now runs great, pulls like a train ,but the down side is it sounds like a boy racers car ,i can't have that ,but at least it is movable, so problem solved, the culprit was a blocked cat, thanks for all the help on this one, off to look for a new down pipe now many thanks ---JK :):y