Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: MV6Danny on 23 October 2013, 03:27:51

Title: sudden misfire 3.0 mv6 1999 model
Post by: MV6Danny on 23 October 2013, 03:27:51

Hi guys just wanted a bit of info for the weekend on where to start with a misfire. I was driving home from work about an hour ago and car was running fine. Came off a roundabout and the tc kicked in and now I have a misfire. :'( I dont understand what could have caused this. No lights on on the dash, I have tried turning the car off and back on and its still doing it. Could it be something simple or a major job like head gasket. I hope its just something silly like spark plugs or coil pack. Any suggestions greatly appreciated.  :y
Cheers and hope someone can help.

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: I_want_an_Omega on 23 October 2013, 08:27:51

Quote from: MV6Danny on 23 October 2013, 03:27:51

Hi guys just wanted a bit of info for the weekend on where to start with a misfire. I was driving home from work about an hour ago and car was running fine. Came off a roundabout and the tc kicked in and now I have a misfire. :'( I dont understand what could have caused this. No lights on on the dash, I have tried turning the car off and back on and its still doing it. Could it be something simple or a major job like head gasket. I hope its just something silly like spark plugs or coil pack. Any suggestions greatly appreciated.  :y
Cheers and hope someone can help.

I had similar symptoms once - turned out to be DIS pack, but could just as easily be a plug or lead problem ........

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: biggriffin on 23 October 2013, 10:37:46

As above. Check plugs,leads and coil pack. It did rain alot yesterday so could have been water going down no6 plug well from the scuttle.

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: The Red Baron on 23 October 2013, 16:19:15

would it not be a good idea to check for codes before delving into the unknown?.  ::)

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: biggriffin on 23 October 2013, 17:26:48

Doubt be any codes. Might be misfire code.

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: symes on 23 October 2013, 19:42:58

sound like drowned dispac---only genous vx would bury it at rear of engine under a sponge--tards >:(

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: tunnie on 23 October 2013, 19:50:19

Quote from: symes on 23 October 2013, 19:42:58

sound like drowned dispac---only genous vx would bury it at rear of engine under a sponge--tards >:(

It's an engine designed for FWD too, so middle of engine bay on others. Always a compromise when designed for both drive methods.

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: Webby the Bear on 23 October 2013, 21:59:11

Sounds like dispac. inspect it for obvious signs of it being shagged. also worth doing resistance checks and compare against spec.

I would take the opportunity to replace the leads and plugs too. leads from ECP about £30 :)

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: MV6Danny on 24 October 2013, 03:41:45

Thanks guys will have a look at weekend. I did check a couple of the leads today by pulling them out and all had oil inside the plug hole. I am assuming that this is something to do with the rocker cover gaskets. May that might be a contributing factor to the misfire aswell. Any suggestions on how to get the oil out or should I just take the plugs out and let the oil go into the cylinders?  :-\
Cheers  :y

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: henryd on 24 October 2013, 11:39:03

Quote from: MV6Danny on 24 October 2013, 03:41:45

Thanks guys will have a look at weekend. I did check a couple of the leads today by pulling them out and all had oil inside the plug hole. I am assuming that this is something to do with the rocker cover gaskets. May that might be a contributing factor to the misfire aswell. Any suggestions on how to get the oil out or should I just take the plugs out and let the oil go into the cylinders?  :-\
Cheers  :y

use an old syringe with a bit of washer tube or similar to suck out the oil and clean the plug lead end with brake cleaner, once dry try it and see if the misfire is gone,mine did same when I first had it and ran fine afterwards until I got chance to replace cam cover gaskets/seals :y

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: MV6Danny on 24 October 2013, 17:14:08

Quote from: henryd on 24 October 2013, 11:39:03

Quote from: MV6Danny on 24 October 2013, 03:41:45

Thanks guys will have a look at weekend. I did check a couple of the leads today by pulling them out and all had oil inside the plug hole. I am assuming that this is something to do with the rocker cover gaskets. May that might be a contributing factor to the misfire aswell. Any suggestions on how to get the oil out or should I just take the plugs out and let the oil go into the cylinders?  :-\
Cheers  :y

use an old syringe with a bit of washer tube or similar to suck out the oil and clean the plug lead end with brake cleaner, once dry try it and see if the misfire is gone,mine did same when I first had it and ran fine afterwards until I got chance to replace cam cover gaskets/seals :y

I'll give that a try. Cheers :y

Title: Re: sudden misfire 3.0 mv6 1999 model
Post by: MV6Danny on 27 October 2013, 01:30:17

All sorted now. Cheers for the help guys. :y
I used a syringe and a piece of tube to suck the oil from the plug wells, all 6 were flooded which means rocker cover gasket change is on the agenda. Will use genuine this time round as recommended by everyone on here only used pattern when I did the head gaskets as they came in the kit.
I changed the plugs and the dis pack and problem solved.
Back to more hassle free motoring for a while hopefully.  ::)