Zafira dual fuel CEL on when in LPG

Giggletons

Hi I have a zafira dual fuel 1.8 2002.
When I switched over to LPG (even after warming engine in petrol) she starts to misfire and loose power.
The check engine light comes on along with the traction control light.
If in gas she also has an occasional rough idle.
If I switched back to petrol the light remains on until I erase the p303 code with diagnostic tool and stays off in petrol. The instant I switch to lpg bang! Both lights return and we begin to misfire.
I am struggling to locate my lpg filter or a service station capable of dealing with my system.
I have had a new coil pack, new spark plugs, and drove a tank of injector cleaner through.
Would my lambda and maf be faulty if it's only a problem in lpg? I assume for some reason they would cause an issue which ever fuel I was on?
Any ideas please?

BeenThroughItAll

Get the codes read, that'll be a start. LPG tends to show up any weakness in the ignition system. No point worrying about injector cleaner, that won't help the LPG injectors.

forgotmyname

If the codes P0303 then its a cylinder 3 misfire. When were the plugs and leads last changed? Use quality plugs and leads not cheap ones and treble check the gaps.

When was the LPG system serviced last?

BeenThroughItAll

forgotmyname wrote: »

If the codes P0303 then its a cylinder 3 misfire. When were the plugs and leads last changed? Use quality plugs and leads not cheap ones and treble check the gaps.

When was the LPG system serviced last?

Blimey, well spotted. I read that post about five times and didn't see the code in there at all, which is why I said get the codes read!

just goes to show how easily missed text can be.

forgotmyname

Its when I read a post and think what idiot wrote that, then check the name and find it was me