Lpg backfiring helppp

[Holdenvycommie]

I need help my vy Commodore 04 backfires on lpg but doesn't on fuel ... I've changed the coil packs the leads and still backfires I'm over replacing air boxes ... any help would be appreciated cheers

 

[J_D 2.0]

What type of system is it? Vapour injection or mixer? If it’s vapour injection maybe one or more of the injectors aren’t closing properly?

 

[Holdenvycommie]

What you mean by vapour/ injection mixer sorry all new to.this lpg...

This is the set up under my bonnet

 

[Holdenvycommie]

Pictures won't.upload ...

 

[Subju]

a

 

[Holdenvycommie]

Sprint gas I'm pretty sure as it had it on the car when I got it .. and I've just left the air box uncliped for the mean time saves getting another air box lol but just trying to work out why it is backfiring on gas as it's perfect on petrol..

 

[Subju]

a

 

[Holdenvycommie]

Alrightly cheers I was going to take it to a lpg servicing place but wanted tO know what involved in their service if you know mate

 

[J_D 2.0]

What you mean by vapour/ injection mixer sorry all new to.this lpg...

This is the set up under my bonnet

If it’s vapour injection it will have a seperate set of “fuel injectors“ for the LPG and hoses going to the inlet manifold. Like this.

 

[Holdenvycommie]

Oh okay nah it's just got the normal fuel injectors and the gas thingy on the right hand side