Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: fozzy on 11 September 2008, 20:38:41
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Hi All, I am a newbie to this site, and hoping someone can help or at least give me a few pointers. I have an omega reflection ('98) 2.5 v6, which has all of a sudden started running on 5 cylinders. I took out the plug(number 1) an changed it with another one but still the same which indicates not a plug problem. I am thinking of changing the leads but didn't want to go down the, change everything until it 's cured road. Is there anything else it is most likely to be?, how easy is it to change the leads?, i looked at them and cannot see where they go or how to access them.
Thanking you in advance
Regards Fozzy
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Think you really need to be checkin for the Omega classic oil in plug wells, caused by blocked breathers. Oil cooks your ht leads causing missfire. Check plug wells, and while your pulling plugs check the base of the leads for damage to the rubber, nics and tears can allow the spark to escape. Also check the other end of the lead for a good connection to the dis pack. If all thats ok and your happy its not
the plugs(40k life) then its a gamble on changing the dis pack or the leads. Some say more than one cylinder and likely to be dis pack.
Why are you sure by changing 1 plug that its not plugs? Vx do best deal on 4 electrode plugs, euro car parts do ht leads for 35 quid but are not very good, not numbered and the lengths are not right for the omega, vx want tun plus a side. Plenty to choose from in between. Dis from a breaker. A couple on here. Hth.
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Just to clarify, you have only checked one spark plug?
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Just to clarify, you have only checked one spark plug?
Or swapped 1 for another on the same engine?
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thnx for rapid response, got a new plug and tried that, the plug end of the lead looks ok, can't see where other end of plug lead goes to or even how to get to it. There was a bit of oil in number 1 plug well Though (the one thats not firing). How do i get the leads of to check/clean them.
Regards
Fozzy
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Sorry not making it very clear am i?. I am only assuming its running on 5 and number 1 not firing as that is the only lead i could pull off in the time i had. It made no difference with the lead on or off to the running of the engine. Mileage is 113k if that helps, plugs are ngk twin electrode.
Regards Fozzy
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Think the best thing for me to do would be to wait till sat when not working and get under the bonnet and have a good clean up. Are the breathers easily accessible?
Regards
fozzy
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Sorry not making it very clear am i?. I am only assuming its running on 5 and number 1 not firing as that is the only lead i could pull off in the time i had. It made no difference with the lead on or off to the running of the engine. Mileage is 113k if that helps, plugs are ngk twin electrode.
Regards Fozzy
No worries, just making sure. Sounds like leads to me, but i would check the lead dis pac connection first. Does it come back in at any point or is it same regardless of engine speed?
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thnx for rapid response, got a new plug and tried that, the plug end of the lead looks ok, can't see where other end of plug lead goes to or even how to get to it. There was a bit of oil in number 1 plug well Though (the one thats not firing). How do i get the leads of to check/clean them.
Regards
Fozzy
Think you may have identified yiur problem :-/
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thnx for rapid response, got a new plug and tried that, the plug end of the lead looks ok, can't see where other end of plug lead goes to or even how to get to it. There was a bit of oil in number 1 plug well Though (the one thats not firing). How do i get the leads of to check/clean them.
Regards
Fozzy
Think you may have identified yiur problem :-/
Yep, oil in wells from blown cam cover gaskits caused by blocked breathers. For me, plenum off, get oil out dont let it fall down the bore, cam covers off, change gaskits and o rings apply sealent, re fit covers torque to 8nm, new plugs/ leads, clean breathers plenum and throttle body while your there. Re build. Guides in maintenance section. Its all been well covered on here. Hth
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.......And then ,probably change the dis pack.
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Hi Guys, just got home from work now its off outside to look at the omega. I will look through the guides on here and make a start on dismantling. Thanks for your help and advice, will be sure to let you know how it goes and what the problem is. Thanks again, :)
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Pop the plenum off and check the plug leads and wells as already described.
Also, pop the plugs out and check the insulators for signs of arcing (you will see a thin line down them)
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Sorry for the slight hijack...
I've just done this job including leads. Bought 'Bosch Silicone Power' from ebay and was surprised to find the leads the wrong length and the plug fittings also the wrong length and a poor fit in the cam cover holes.
Anyone else had this with Bosch? Thought they would be alright - or are my 'Bosch' leads dodgy Chinese fakes perhaps? They work fine.
Out of interest, anybody know for sure an aftermarket lead set that has correct length leads and proper plug fittings? Do you really have to go Vx price to get this?
Cheers,
Liam
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give these guys www.vauxcentre.co.uk a ring, got a set of Vx leads from them for about £60
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I have just put on a set of Bosch leads bought off ebay and non were the same as the ones taken off. runs ok but not very tidy!
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Hi All, after a long working week and most of last weekend out with the omega thought i would give you all an update on my problem. Dismantled everything to change cam cover gaskets, job done, far more work involved than working on my cossie, but its done now. Changed leads and plugs, still not firing on two cylinders, a mate of a mate put his diag on it and he is 99.9% sure its the coil pack :(. I am all geared up to do it tomorrow morning. Can anyone offer any help or advice changing it. i know its a nightmare of a job getting to it, any help would be greatly appreciated ;)
Fozzy
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..... I am all geared up to do it tomorrow morning. Can anyone offer any help or advice changing it. i know its a nightmare of a job getting to it, any help would be greatly appreciated ;)
Fozzy
Removing the wiper arms & the scuttle under the screen should just about give you enough room to replace the DIS. Although I had Torx drive sockets, they were 3/8" drive & the body was too big to clear the DIS pack before the spline bit of the socket engaged with the bolt, so I used a 1/4" ordinary hex socket (can't now remember the size .. 8mm?) The first time you see the DIS is when you've removed the last of the 4 bolts.
Open box of plasters and apply as neccesary! ;D ;D
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I think the best tip would be to be prepared to climb into the engine bay on top of the plenum. Put something soft on there. It helps no end.
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Got a set of these leads from Fleabay, They were generally the right lengths, number 6 lead the shortest was only an inch longer, better than the set i had before which was around 9 inches longer and had to tuck away.
http://cgi.ebay.co.uk/VAUXHALL-OMEGA-SINTRA-V6-24V-94-HT-IGNITION-LEADS-625_W0QQitemZ320301160554QQcmdZViewItem?hash=item320301160554&_trkparms=72%3A12%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14
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Andy B, 4 bolts? is that to secure the dis pack? or hold the engine in place ;D. I was actually thinking of re-locating it somewhere else if the leads would reach. I have a large box of plasters on standby, my mate don't wanna know and my brother in law (also a mechanic) aint interested so i know what i am letting myself in for :o
Fozzy
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Andy B, 4 bolts? is that to secure the dis pack? or hold the engine in place ;D. I was actually thinking of re-locating it somewhere else if the leads would reach. ....
Fozzy
Just the 4 M6 Torx headed bolts about 2" long. I'd leave it where Vx put it, it's unlikely you'll need to change it again .... you might be able to move it as far as the HT leads are concerned, but what about the 'LT' side. I doubt the loom is long enough to move the DIS very far.
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oops forgot about the Lt loom, best leaving it where it is then ::) Thanks for the info M6 torx bolts, need to get a set early tomorrow morning. 1/4" drive sound good to me, and also maybe a small child to get their arms behind the engine and do it for me ;D. Well am off now will let you know tomorrow how it went(or is going :o)
Fozzy
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not a technical job mate just bloody awkward,if you need a hand p.m. me,I will drop by and lend you my skinny arms. :y ;D
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Looks like i will be starting mine on Monday as well.
Taking the 'pack' out before buying new to make sure I get the right one.
Are the leads testable with a meter?
Ho Hum.
eddie