Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Please check the Forum Guidelines at the top of the Newbie section

Pages: [1]   Go Down

Author Topic: What causes a misfire?  (Read 1004 times)

0 Members and 1 Guest are viewing this topic.

mark.adams

  • Senior Member
  • ****
  • Offline Offline
  • Gender: Male
  • Cambridgeshire
  • Posts: 696
  • Happy
    • Omega 2.6 V6 Elite
    • View Profile
What causes a misfire?
« on: 04 May 2011, 08:16:00 »
Only happens on LPG, it is a mixer system so fairly simple in operation, doesn't seem to be any pattern to when it occurs, only noticeable on acceleration, feels as though it just skips a heartbeat, VERY occasionally.
Breathers done, new spark plugs, runs fine on petrol.
No EML, no errors stored in ECU.
Have i missed anything??
Logged
Omega 2.6 V6 Elite in Shiny Black

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 107027
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: What causes a misfire?
« Reply #1 on: 04 May 2011, 08:18:10 »
LPG needs a stronger spark than petrol, but assuming the HT is OK, you have to look at the LPG mixer system
Logged
Grumpy old man

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: What causes a misfire?
« Reply #2 on: 04 May 2011, 16:58:33 »
As above really... Could even be the coil pack breaking down :-/ But my first guess (and it is a guess!) is that the mixture is leaning out under acceleration. This is a situation you need to fix ASAP

But, as a word of warning, with a mixer system misfires can be very dangerous and lead to backfires which will do damage to the intake system :o :o
Logged
Whatever it is... I didn't do it

mark.adams

  • Senior Member
  • ****
  • Offline Offline
  • Gender: Male
  • Cambridgeshire
  • Posts: 696
  • Happy
    • Omega 2.6 V6 Elite
    • View Profile
Re: What causes a misfire?
« Reply #3 on: 04 May 2011, 17:45:20 »
Thanks guys,
i don't really know where to start with LPG, it's a BRC mixer system, i guess maybe looking for an air/gas leak on the intake is the first place to look...
Logged
Omega 2.6 V6 Elite in Shiny Black

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: What causes a misfire?
« Reply #4 on: 04 May 2011, 17:48:49 »
Quote
Thanks guys,
i don't really know where to start with LPG, it's a BRC mixer system, i guess maybe looking for an air/gas leak on the intake is the first place to look...

It would be a start. Not really a suitable system TBH
Logged
Whatever it is... I didn't do it

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 107027
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: What causes a misfire?
« Reply #5 on: 04 May 2011, 17:55:24 »
I'm guessing (it is a guess) that a mixer to SGI is an easy enough conversion, given tank and pipework to engine is in place?
Logged
Grumpy old man

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: What causes a misfire?
« Reply #6 on: 04 May 2011, 17:56:21 »
Quote
I'm guessing (it is a guess) that a mixer to SGI is an easy enough conversion, given tank and pipework to engine is in place?

Depends... It's still a complete new Front end kit ;)
Logged
Whatever it is... I didn't do it

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 107027
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: What causes a misfire?
« Reply #7 on: 04 May 2011, 17:57:30 »
Quote
Quote
I'm guessing (it is a guess) that a mixer to SGI is an easy enough conversion, given tank and pipework to engine is in place?

Depends... It's still a complete new Front end kit ;)
Indeed - but to retrofit is possibly easy, given coolant is (hopefully) in place to evap. Guessing you can't use same evap?
Logged
Grumpy old man

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: What causes a misfire?
« Reply #8 on: 04 May 2011, 17:59:12 »
Quote
Quote
Quote
I'm guessing (it is a guess) that a mixer to SGI is an easy enough conversion, given tank and pipework to engine is in place?

Depends... It's still a complete new Front end kit ;)
Indeed - but to retrofit is possibly easy, given coolant is (hopefully) in place to evap. Guessing you can't use same evap?

Can't use same vap, and coolant depends how it was plumbed in. Not too bad a job though :y
Logged
Whatever it is... I didn't do it

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 107027
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: What causes a misfire?
« Reply #9 on: 04 May 2011, 18:01:01 »
Just thinking aloud, given the trouble that mixers are...  ...though my experience is limited purely to tunnie's project shed...
Logged
Grumpy old man

mark.adams

  • Senior Member
  • ****
  • Offline Offline
  • Gender: Male
  • Cambridgeshire
  • Posts: 696
  • Happy
    • Omega 2.6 V6 Elite
    • View Profile
Re: What causes a misfire?
« Reply #10 on: 04 May 2011, 19:06:22 »
Well i'm up for it if you guys want to come onboard.
What do i need to buy?
Quick Q? With a SGI, if you turn the car off, the restart, does it start straight away, only with the mixer system, it needs to be turned over for a good 5 seconds before it starts on petrol after being used on gas....
Logged
Omega 2.6 V6 Elite in Shiny Black

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: What causes a misfire?
« Reply #11 on: 04 May 2011, 19:50:03 »
Quote
Well i'm up for it if you guys want to come onboard.
What do i need to buy?
Quick Q? With a SGI, if you turn the car off, the restart, does it start straight away, only with the mixer system, it needs to be turned over for a good 5 seconds before it starts on petrol after being used on gas....
It starts on petrol then switches over automatically! Have a look through the maintenance guides for the how to. Kit price somewhere around £250+vat :y
Logged
Whatever it is... I didn't do it
Pages: [1]   Go Up
« previous next »
 

Page created in 0.024 seconds with 17 queries.