Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: CHRISKG on 21 November 2012, 10:51:00
-
Hi there
Just after some pointers before I dive into the engine bay and start pulling things apart.
Facelift 3.0 MV6.
I've owned the car a year and it has happened once before but cleared up within a few hours or driving.
The miss-fire has now come back and hasn't gone away.
1st start in the morning the engine runs smooth as a turbine - drive 1/4 mile down the road and the engine starts missing - as reguar as clockwork it will start to stutter at the same point in the journey every day and will stay rough all day until the next morning start up
1st inspection the foam under the scuttle is sopping wet and looks to be dripping onto the driver side cylinder bank rocker cover - i've dried the foam out and the plug wells are dry.
This leads me to think that the dis pack may have got water into it - would a leaky scuttle cause the dis pack to get wet? Though i'm thinking that once the dis pack got wet or started to fail the stutter would be permanent?
It does sound like it's firing on 4 when it stutters - so fits into the idea that a coil on the dis pack is failing ( I understand that there are 3 coils and its a wasted spark set up).
Any thoughts appreicated.
Chris
-
Hi there
Just after some pointers before I dive into the engine bay and start pulling things apart.
Facelift 3.0 MV6.
I've owned the car a year and it has happened once before but cleared up within a few hours or driving.
The miss-fire has now come back and hasn't gone away.
1st start in the morning the engine runs smooth as a turbine - drive 1/4 mile down the road and the engine starts missing - as reguar as clockwork it will start to stutter at the same point in the journey every day and will stay rough all day until the next morning start up
1st inspection the foam under the scuttle is sopping wet and looks to be dripping onto the driver side cylinder bank rocker cover - i've dried the foam out and the plug wells are dry.
This leads me to think that the dis pack may have got water into it - would a leaky scuttle cause the dis pack to get wet? Though i'm thinking that once the dis pack got wet or started to fail the stutter would be permanent?
It does sound like it's firing on 4 when it stutters - so fits into the idea that a coil on the dis pack is failing ( I understand that there are 3 coils and its a wasted spark set up).
Any thoughts appreicated.
Chris
Most certainly ... common fault ... the DIS pack then rusts and starts to fail .... sounds to me like yours is fine when cold but as it heats up and expands then something is breaking down .. probably a gap is getting too wide somewhere ....
IMHO whip the DIS pack off and examine thoroughly, then get a known good one from one of the breakers here .. :)
-
I take it the DIS pack is located behind the engine, under the scuttle, and requires more than a casual effort to get at it to inspect?
On 1st inspection I cant see where the heck it is.
What kind of time element are we looking at to remove & refit?
-
Sounds like the classic "knock on effect" :'(
Scuttle drips water onto dispack which eventually rusts and splits causing a miss fire.As advised when cold little or no expansion in the casing so for a short time of running it will be fine.
Get it fixed sooner than later as a miss fire will be doing the cats no good at all and will just add to the "knock on effect"
-
Numerous good write ups on replacing it...just do a search.
Depending on skill levels should remove and replace in 2 hours :y ,although the cuts will last alot longer ;D
-
Cheers
I was conscious of the cats getting hammered with the un-burnt fuel so have been using the car as little as possible.
I'll have dig around for a how to guide.
-
Cheers
I was conscious of the cats getting hammered with the un-burnt fuel so have been using the car as little as possible.
I'll have dig around for a how to guide.
http://www.omegaowners.com/forum/index.php?topic=90602.0
:)
Lizzie has done this recently and made some observations ..
http://www.omegaowners.com/forum/index.php?topic=109316.0
HTH :)
-
Cheers.
I'll weigh up whether I have the patients to tackle this myself.
-
Cheers.
I'll weigh up whether I have the patients to tackle this myself.
The patient will requie plasters :) ;)
-
Cheers.
I'll weigh up whether I have the patients to tackle this myself.
The patient will requie plasters :) ;)
and patience .... :)
-
....
The patient will requie plasters :) ;)
::) ::) ::) ::) ::)
-
As MV6 in the search brings up numerous previous posts, I decided to pick on the latest MV6 post, Off topic I know but how can an MV6 be automatic? I thought the point of it being an 'MV6' was because it was a Manual V6?
-
Also check plug wells before writing off the coilpack,if they are full of oil from leaky cam cover seals it'll miss like hell,mine did it and once clear of oil and leads cleaned it was no more trouble :y
-
As MV6 in the search brings up numerous previous posts, I decided to pick on the latest MV6 post, Off topic I know but how can an MV6 be automatic? I thought the point of it being an 'MV6' was because it was a Manual V6?
It's covered somewhere... IIRC it's Motorsport V6 :-\ ;)
-
Cheers for that :-D
-
Hi there
Just after some pointers before I dive into the engine bay and start pulling things apart.
Facelift 3.0 MV6.
I've owned the car a year and it has happened once before but cleared up within a few hours or driving.
The miss-fire has now come back and hasn't gone away.
1st start in the morning the engine runs smooth as a turbine - drive 1/4 mile down the road and the engine starts missing - as reguar as clockwork it will start to stutter at the same point in the journey every day and will stay rough all day until the next morning start up
1st inspection the foam under the scuttle is sopping wet and looks to be dripping onto the driver side cylinder bank rocker cover - i've dried the foam out and the plug wells are dry.
This leads me to think that the dis pack may have got water into it - would a leaky scuttle cause the dis pack to get wet? Though i'm thinking that once the dis pack got wet or started to fail the stutter would be permanent?
It does sound like it's firing on 4 when it stutters - so fits into the idea that a coil on the dis pack is failing ( I understand that there are 3 coils and its a wasted spark set up).
Any thoughts appreicated.
Chris
Most certainly ... common fault ... the DIS pack then rusts and starts to fail .... sounds to me like yours is fine when cold but as it heats up and expands then something is breaking down .. probably a gap is getting too wide somewhere ....
IMHO whip the DIS pack off and examine thoroughly, then get a known good one from one of the breakers here .. :)
Absolutely right if my recent experience with plugs and DIS pack is anything to go by :y :y
-
Cheers.
I'll weigh up whether I have the patients to tackle this myself.
The patient will requie plasters :) ;)
and patience .... :)
and an ability to swear a lot to let off frustration about the miggy designers!! ::) ::) ;D ;D
The job is certainly awkward, but I found very straightforward when in the right frame of mind and very good sunlight. ;)
-
Had the diss pack changed for a Bosch unit.
The bad news is i'm 4 hours labour lighter (job tuned into a nightmare) and the car still doesn't work right.
BUT it seems all cylinders on drivers side bank are now firing and it's just missing a cylinder and sometimes two on the passengers bank by the looks/sound of it.
2 problems masquerading as one I think.
Mechanic didn't check state of plugs/plug wells or leads when he had it in bits which is a bit annoying. Though they did offer to investigate further F.O.C which was good of them.
And although I haven't really driven it much at all since it started missing the cat(s) are now toasted too.... Definitely a cat rattle coming from under the car.
Am stripping out passenger plugs this afternoon for inspection.
-
I had no.4 plug well full of water plus a split in rear most passenger side HT boot that must be causing an intermittent miss-fire .
What is it they say...? If you want a job doing...
-
Had the diss pack changed for a Bosch unit.
The bad news is i'm 4 hours labour lighter (job tuned into a nightmare) and the car still doesn't work right.
BUT it seems all cylinders on drivers side bank are now firing and it's just missing a cylinder and sometimes two on the passengers bank by the looks/sound of it.
2 problems masquerading as one I think.
Mechanic didn't check state of plugs/plug wells or leads when he had it in bits which is a bit annoying. Though they did offer to investigate further F.O.C which was good of them.
And although I haven't really driven it much at all since it started missing the cat(s) are now toasted too.... Definitely a cat rattle coming from under the car.
Am stripping out passenger plugs this afternoon for inspection.
:o
An hour and a half max to do the dis pack ;)
-
Agreed - 4 hours is very heavy for this job - I certainly did mine in well under 2 hours start to finish. Guy was obviosly not a good mechanic taking that time to change a diss pack and not check plugs, plug wells and leads :(
Did you see your old disspack?
-
Yes. I nearly fell over in shock when I was presented a bill for £192 worth of labour inc VAT. Apparently they couldn't get one of the bolts out of the diss pack which added 2 hours to the job
Having just spent about a grand or so with them in the past few months and several grand over the years on various bits and bobs on our other cars I though they might just say 'giz 2 hours labour seeing as we haven't really helped matters in any way shape or form this time'.
That's another matter though... They're a good bunch of guys and business is business I suppose.
Anyway after a quick clear out of the plug wells and a some black maskers on the HT lead the motor is running OK. Slight stutter under load but 99.99% better than it was.
New plugs & HTs on way.
Any plug well cleaning suggestions?
-
Unlikely that the cats are toasted.More likely to be a loose heat shield or internals of centre boxes rotting and becoming losse inside the boxes.
-
Unlikely that the cats are toasted.More likely to be a loose heat shield or internals of centre boxes rotting and becoming losse inside the boxes.
You think?
Exhaust is brand new and only just fitted so should be ok.
It sounds like the nearside cat is full of marbles when its running. I'd be delighted to be wrong on this!
-
If it's been run for a while with a miss fire the cat could be furbered