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[chrisgixer]

It could be a border line coil PAC. But I'd be checking trims, lambdas and codes again, and the gas set up, before condemning cp

[D]

So eventually I manage to fill the car with LPG. Been too busy, to contemplate faffing around with LPG/misfires etc. Did about 600 miles on petrol. Now that was painful! Particularly at the pumps.

Switch to LPG and the misfire starts almost within a minute of it switching over. Oddly though, it is when it is idling that the issue is most noticeable. Rev the engine and the misfire almost seems to go away. Would that suggest a LPG supply/mapping issue?

Hopefully I will be getting the LPG looked at soonish.

[Entwood]

LPG needs a "better" spark to ignite than petrol, so worth checking plugs/leads/coilpacks for any "wear" before stripping things down too much.

Can run fine on "borderline" ignition side on petrol but LPG will ALWAYS find any weaknesses.

[05omegav6]

LPG needs a "better" spark to ignite than petrol, so worth checking plugs/leads/coilpacks for any "wear" before stripping things down too much.

Can run fine on "borderline" ignition side on petrol but LPG will ALWAYS find any weaknesses.

Plugs were brand new GM quads fitted last week, coil pack not pretty, but a long way from horrible...

[ffcgary1]

i take it that you have checked and fitted new lpg filters in the system as this will also cause a misfire.

[tunnie]

Is the vaporiser freezing up? Good coolant flow thought it?

[D]

Plugs are new as Al said. Hopefully having lpg checked this weekend. I however have this horrible feeling that it will end up being the coilpack.

[D]

Final update. Turns out it was a faulty injector. Swapped it for a new one and all is back to how it was. LPG log shows nearly 900 hours on gas and 150 on petrol.

[05omegav6]

One of the lpg ones?

Glad sorted