Hi guys i have a slight misfire on my V8 supercharged which also run's on lpg it has also valve guard with it i have changed the plugs.Have used brake fluid to check for air leaks,my lambarda sensos seems as good as it can have done compression test on the most affected cylinder but they all seem to have a slight misfire with number 2 the worst has anyone had problems with coil packs as once its warm it runs better i have also put in 1 cqn of injector cleaner and i am awaiting a second which is supposed to be the real stuff for use with lpg i await your laughs on that one

missfire on start up from cold ? or all the time ? how many miles on LPG ? Does it have a valve saver lube to each cylinder ? 2007 SUPERCHARGED HST

Hi yes it has a flash lube system on it it has about 91,000 on the clock it was converted a couple of years ago so not to many miles on gas I would think the miss seems to be a bit worse when cold but sometimes I can't feel it either

Does the flash lube feed each cylinder ?
The petrol injectors are a problem with the supercharged, but only when cold , goes away when warm.
Are you getting any fault codes ? 2007 SUPERCHARGED HST

Will check in flash line but think so no codes I get lean bank on log but that I'm told is normal

Yeah lean code does show up , but check you have a feed on the flash lube to each cylinder and not one to the intake . That's first job , then we can go from there  2007 SUPERCHARGED HST

Ok will do are you thinking of valve damage if it does not have flash live to each cylinder then

Need to rule it out , but you have a few options if it has 2007 SUPERCHARGED HST

Hi just had a quick look without taking anything off apart from the engine cover I only see 1 pipe from flash line bottle and it looks like it goes in to manifold by the rear of the air intake by the throttle body

Ok I'm afraid that's good enough for the engine .I don't know why installer's don't fit them to each cylinder it needs a feed to each cylinder to make sure your valves don't get worn . Next step I would do is to check the valve clearances ! 2007 SUPERCHARGED HST

Ok before I start to rip it apart I think I will try a compression test on each cylinder

Thinking about it the misfire that shows is inconsistent so I would have thought that to be valves it would be the same all the time but on the diagnostic it's not it's more like electrical

OK but you will have to strip out the hole intake and fuel injectors to fit the correct delivery system for your flash lube ,so each cylinder is fed , This has to be done ! or you will defo get valve problems . when doing that I would advise you getting the petrol injector's tested and check the valve clearances . 2007 SUPERCHARGED HST

As the car came with it fitted do I take it to a lpg guy or do I specialist as it sounds as if a lot of people dont know what there doing I have some cleaned coming which was recommended by a specialist lpg company but the way the misfire is it seems more electrics

Take it to a good log place one that does the surperchaged engines , but to fit the flash lube kit to the engine will not be cheap . Does it misfire on gas and petrol ? 2007 SUPERCHARGED HST