Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: mka306 on 08 July 2015, 12:30:41
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Took the car to the petrol station for a top up and on the return journey the EML started to flash and it felt like the car wasn't using all 6 cylinders, car is also juddery and when on idle the exhaust is popping instead of a smooth note. Any ideals folks????
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Read the codes, I'm guessing p0300 and p030x where x = 1-6.
Coil pack, leads, plugs, oil in plug wells are the starting points.
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Is there a way to check the coil packs as I don't have a code reader? Is this a common fault?
Thank you for the advice though.
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Is there a way to check the coil packs as I don't have a code reader? Is this a common fault?
Thank you for the advice though.
You don't need a code reader, do the pedal trick as described in the maintenance guides :y
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You don't need a code reader to get the basics from a 3.2, you can use the pedal trick here:
http://www.omegaowners.com/forum/index.php?topic=90581.0 (http://www.omegaowners.com/forum/index.php?topic=90581.0).
Just lift the coil packs and any oil problem will be obvious. Driver's side is easy access, passenger side there is some furniture to move first.
Oil in plug wells will likely have toasted the coil pack on the affected side. See cleaning crankcase breathers here:
http://www.omegaowners.com/forum/index.php?topic=90653.0 (http://www.omegaowners.com/forum/index.php?topic=90653.0)
But check you codes first.
Best of luck!
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Oops - sorry for cross post Tunnie
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Thanks for that info guys, great help :y
I had 2 codes, the first was 0300 and the second was 0305, any ideas guys?
Thanks very much for this help its priceless :y :y
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You have a misfire on cylinder 5 . Remove coil pack and check for oil/water.And while your there check all is well with the plug. :y
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You have a misfire on cylinder 5 . Remove coil pack and check for oil/water.And while your there check all is well with the plug. :y
Ok that's great, I changed the 6 plugs a month ago for brand new GM ones, when I did that there was no oil or water around the old plugs and today is the first drive I've had in her but I will check again, I think I may well have to change the coil pack on the 1-3-5 side as no doubt that will be the issue. Thanks for the help everyone :y
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Have a feel of the sponge below the scuttle to see if it is wet/damp :y
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You have a misfire on cylinder 5 . Remove coil pack and check for oil/water.And while your there check all is well with the plug. :y
Ok that's great, I changed the 6 plugs a month ago for brand new GM ones, when I did that there was no oil or water around the old plugs and today is the first drive I've had in her but I will check again, I think I may well have to change the coil pack on the 1-3-5 side as no doubt that will be the issue. Thanks for the help everyone :y
I've twice bought plugs from VX (a full set) that has caused problems. Both on different occasions. I wasn't happy with it from the moment I started back up, but I checked and double checked everything. I needed to use the car, so I drove it on 5 cylinders (no codes might I add). After about 100 miles, I had more time to take a better look, I removed the COPs and the top half of one of the plugs came out with it. There must have been a crack in it when I fitted it, but it took a while to develop into something visual.
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You have a misfire on cylinder 5 . Remove coil pack and check for oil/water.And while your there check all is well with the plug. :y
Ok that's great, I changed the 6 plugs a month ago for brand new GM ones, when I did that there was no oil or water around the old plugs and today is the first drive I've had in her but I will check again, I think I may well have to change the coil pack on the 1-3-5 side as no doubt that will be the issue. Thanks for the help everyone :y
I've twice bought plugs from VX (a full set) that has caused problems. Both on different occasions. I wasn't happy with it from the moment I started back up, but I checked and double checked everything. I needed to use the car, so I drove it on 5 cylinders (no codes might I add). After about 100 miles, I had more time to take a better look, I removed the COPs and the top half of one of the plugs came out with it. There must have been a crack in it when I fitted it, but it took a while to develop into something visual.
Ok I will look at the plug in cylinder 5 and see if it has any obvious problems and go from there, I've got both coil packs on there way from a friend who has a mate in an omega brakers yard in Nottingham, £40 for near enough new coil packs taken from an engine that was sold from his yard so happy to change both and see how she runs.
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I've stripped the engine down and removed the coil packs, there is no oil or water around any of the six plugs so I removed plug 5 and it looked fine, just the usual blackening at the bottom of the 4 prongs but most of it was still clean, no cracks in the plug ect, I then removed plug 1 and it was similar to plug 5 but when I looked at the rubber sleeve on the coil pack that sits over the plug it had a split in the rubber from bottom to top, this would suggest to me that the problem is with the coil pack and most likely the split in the rubber.
I will update this thread when the new coil packs are on and the engine is running again.
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As you have it apart, swap plug 5 with another plug. Drive it and double check that the code doesn't move to confirm coil.
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Assuming that you haven't a) topped up with diesel or b) bought some shit fuel :-\ Supermarket perchance?
If the coil pack/plug checks prove inconclusive, drain the tank, refill with Shell V power and throw in two cans of Wynns injector cleaner. Then give the car a good thrashing... aim for sub 20mpg and repeat but drive normally for the second tank :y
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Assuming that you haven't a) topped up with diesel or b) bought some shit fuel :-\ Supermarket perchance?
If the coil pack/plug checks prove inconclusive, drain the tank, refill with Shell V power and throw in two cans of Wynns injector cleaner. Then give the car a good thrashing... aim for sub 20mpg and repeat but drive normally for the second tank :y
No I most definitely did not use any diesel, haven't owned a diesel for some years, I do use Tesco petrol station but I don't believe the £20 of fuel I put in for the first time since owning the car will cause this issue.
I have two new coil packs coming tomorrow so I will replace them and I will change the plug on no.5 just to be on the safe side but one thing my neighbour said was when I pulled away the day the miss fire happened he said the fumes smelt very rich as if it was over fuelling, what would cause over fuelling??
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Assuming that you haven't a) topped up with diesel or b) bought some shit fuel :-\ Supermarket perchance?
If the coil pack/plug checks prove inconclusive, drain the tank, refill with Shell V power and throw in two cans of Wynns injector cleaner. Then give the car a good thrashing... aim for sub 20mpg and repeat but drive normally for the second tank :y
No I most definitely did not use any diesel, haven't owned a diesel for some years, I do use Tesco petrol station but I don't believe the £20 of fuel I put in for the first time since owning the car will cause this issue.
I have two new coil packs coming tomorrow so I will replace them and I will change the plug on no.5 just to be on the safe side but one thing my neighbour said was when I pulled away the day the miss fire happened he said the fumes smelt very rich as if it was over fuelling, what would cause over fuelling??
Just swap over the 1,3,5 coil pack for now. You have no problem on the other bank... deal with the 305 code first :y
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V6 Omegas ALWAYS overfuel when cold, so don't fret that too much ;) besides, if one cylinder isn't firing properly, then there's a chance that unburnt fuel could enter the exhaust, although iirc, the ecu shuts down the relevant injector :-\
As for only buying £20 of Tesco fuel, if that was merely to top off, then in percentage terms it isn't a big deal, and should clear through quickly enough... but if it was below half a tank then potentially half your fuel could be bad, especially if it was from the dregs of their tank ::)
Why do half a job though? Change all the plugs whilst you're at it :y
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Assuming that you haven't a) topped up with diesel or b) bought some shit fuel :-\ Supermarket perchance?
If the coil pack/plug checks prove inconclusive, drain the tank, refill with Shell V power and throw in two cans of Wynns injector cleaner. Then give the car a good thrashing... aim for sub 20mpg and repeat but drive normally for the second tank :y
I would agree with this. If the car ran fine before putting the fuel in and was rough as a hedgehogs arse shortly after, then it would point to dodgy fuel to me.
I wouldn't throw new parts at the problem until this has been investigated.
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V6 Omegas ALWAYS overfuel when cold, so don't fret that too much ;) besides, if one cylinder isn't firing properly, then there's a chance that unburnt fuel could enter the exhaust, although iirc, the ecu shuts down the relevant injector :-\
As for only buying £20 of Tesco fuel, if that was merely to top off, then in percentage terms it isn't a big deal, and should clear through quickly enough... but if it was below half a tank then potentially half your fuel could be bad, especially if it was from the dregs of their tank ::)
Why do half a job though? Change all the plugs whilst you're at it :y
I'm only replacing plug 5 because there all brand new plugs, I changed them about a month ago and haven't driven on the new plugs until yesterday. I will fill the tank with shell v power as adviced and hopefully the issue will be resolved.
So far all your help has been great so what ever happens I'd just like to say a big thank you to you all for the useful info. I will update you all tomorrow hopefully with good news.
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Ok the engine is back together with both coil packs replaced and the no.5 spark plug replaced, started her up and job done, that lovely v6 roar is back. So thank you all for your help it was priceless.
Then I took her out for a spin and one thing I did notice which was a tad annoying was when I was driving at 30mph the revs wouldn't sit still, they kept pulsing from just over 1k rpm up to 1500 rpm, any ideas why it does this or is it an automatic thing? When driving through the gear it was no problem but when in a gear and driving at a set speed it started to happen, I did give her a good blast and that didn't seem to work either??
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Yup, mine stinks of petrol at first, to the point I thought I had a fuel leak, but no.
Odd engine behaviour though. I had a similar occurrence, and it was down to a bad seal between Throttle body and the plenum, and a badly adjusted throttle body screw. There was also a small air leak elsewhere. Lots of engine work had happened on mine, which was then laid up for a period of years, so my wavering idle and roughness was down to multiple issues (plus poor coilpack wiring, which was causing misfiring)
Given you've done a fair bit of work yourself, which presumably includes plenum removal, I'd be looking for air leaks. :)
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Yup, mine stinks of petrol at first, to the point I thought I had a fuel leak, but no.
Odd engine behaviour though. I had a similar occurrence, and it was down to a bad seal between Throttle body and the plenum, and a badly adjusted throttle body screw. There was also a small air leak elsewhere. Lots of engine work had happened on mine, which was then laid up for a period of years, so my wavering idle and roughness was down to multiple issues (plus poor coilpack wiring, which was causing misfiring)
Given you've done a fair bit of work yourself, which presumably includes plenum removal, I'd be looking for air leaks. :)
Sounds reasonable to me, I shall have a look for any air leaks.