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[Martin_1962]

Plume of white smoke and it is smelly comes out of the exhaust on start up.

I think it is injector seepage rather than valve seals, what is the concensus.

Never had oil burning on a cat car so don't know what it would smell like.

[TheBoy]

Plume of white smoke and it is smelly comes out of the exhaust on start up.

I think it is injector seepage rather than valve seals, what is the concensus.

Never had oil burning on a cat car so don't know what it would smell like.

White smoke = water?

[Marks DTM Calib]

How long does yours run on petrol for before switching to LPG...?

[Elite Pete]

Isn't water a by product of running on LPG.

[Kevin Wood]

Water is a by product of running on anything  

That's why exhausts rust through  

I've known cat equipped cars to throw out a plume of white smoke if they've been flooded so a leaking injector sounds plausible. Any other problems starting? Does cranking with foot on floor for a few seconds followed by starting normally help?

I guess if the petrol injection system only gets used during warm up it might be more prone to getting bunged up. Might be worth running a tankful of fresh fuel through it without using the LPG and maybe add some fuel system flush?

Kevin

[Martin_1962]

I have chucked some Redex in now, runs for about 2 minutes when cold and 30 seconds when warm and about 40-50 seconds when started after a few hours.

I think it is fuel seepage - I'll try sniffing again.

[Martin_1962]

Can't afford to chuck a tank of petrol through

[TheBoy]

I have chucked some Redex in now, runs for about 2 minutes when cold and 30 seconds when warm and about 40-50 seconds when started after a few hours.

I think it is fuel seepage - I'll try sniffing again.

Presumably it is happening before the switchover?

Could the lpg injectors be leaking (yours is SGI?). Obviously the petrol ones could be as well.

[Martin_1962]

Firstly LPG systems leak - they all do - prevents pipes delaminating there are microscopic holes to allow leaking gas to escape rather than delaminate and burst the hose.

Secondly the gas would not return to liquid.

It did it when I started the car from cold this morning

[Martin_1962]

The propane would dissipate or burn very rich, this I am sure was based on a liquid.