Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Tony H on 20 July 2013, 14:38:04

Title: Annoying missfire
Post by: Tony H on 20 July 2013, 14:38:04

Afternoon all, my Miggy has developed a missfire. it doesn't happen when the engine is stone cold but appears as soon as the engine starts to warm up, the missfire happens on gradual acceleration but disappears on hard acceleration and all six pots start to fire. Anyone got any clues.
TIA
Regards
Tony

Title: Re: Annoying missfire
Post by: henryd on 20 July 2013, 15:07:52

V6 but 2.5/3.0 or 2.6/3.2?

Title: Re: Annoying missfire
Post by: Tony H on 20 July 2013, 22:01:17

2.5  :y It used to state that on my avatar until I was hacked and someone nobbled it!!!

Title: Re: Annoying missfire
Post by: TheBoy on 20 July 2013, 22:06:56

Paperclip it anyway, but I suspect nothing.

Also check the plug wells for oil, and the state of the HT leads. If you can, visually inspect the DIS pack - bit of a PITA to get out.

Title: Re: Annoying missfire
Post by: dbug on 20 July 2013, 22:10:10

check for oil in plug wells, then plugs, leads, dis pack and compressions ;)

Title: Re: Annoying missfire
Post by: al brown on 21 July 2013, 12:02:51

Had this on mine a while a while ago. Was a broken no 6 plug lead, even tho I had checked it when checking the plugs and plug wells.I thought it was fine until I went to put it back on and it separated in my hand.
Hope you get it sorted.

Title: Re: Annoying missfire
Post by: Tony H on 14 August 2013, 16:23:18

Still got problems the car is of the road at the moment due to no MOT so I couldn't road test the engine under load. The problem now is that I have replaced the lead it runs smoothly at high revs but on initial start up it revved its nuts off then settled down to a very lumpy idle after about 30 seconds and has now developed a back fire at idle  :'(

Title: Re: Annoying missfire
Post by: adey2 on 15 August 2013, 16:33:56

id deffo be checking the dis pack, same prob as mine after missis cooked it on m6, had cracked through on underside so when got warm it broke down on no6 and no1 cyl

Title: Re: Annoying missfire
Post by: omegod on 15 August 2013, 21:45:06

sounds familiar to my old 3.0 which turned out to be the coil pack, I think I have a few odd leads knocking around if you want to try substitution or if need be give me a shout for a hand changing the coil pack  :y 

Title: Re: Annoying missfire
Post by: Andy H on 15 August 2013, 22:54:45

I spent a lot of time trying to fix a misfire on my previous 2.6 V6.

A set of new GM spark plugs fixed it :y