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Discussion Starter #1
hi

with a dual fuel ef 4.0 what causes a car to sometimes not all start slow/uneven then run rough on startup for a few seconds when starting on lpg.

havent tried on petrol

put a head gasket sealer Liquid intelligence) in and followed the method that was given and theres now not as much moisture out exhaust running on gas even after stopping and there was nearly always moisture before but only put sealer in yesterday so probably got to give it time

would it be a sticky valve and ifso is there something you can buy that frees valves and lifters

or would starter motor be on way out

has anyone got ideas
 

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The head may well still be leaking coolant into one or more cylinders. Get the engine up to normal operating temperature so the cooling system is pressurised then, after letting it stand overnight, remove all the spark plugs and twist white kitchen paper towels (strong enough not to be drawn into the cylinder - tissues won't work) labelled with the cylinder numbers into each empty spark plug hole and then turn it over once with the starter motor. Before turning it over have a look at the piston tops with a torch as you may even be able to see the coolant pooled on the piston tops (usually it will be leaking and number 1 and or 6) Yes; some of the the paper towels will be blown out under compression and you will have to rescue them hence the labels. Then see if there is any traces of wet coolant on the ends of the paper towels. This works better if you have a cooling system pressure tester and you can leave it pressurised for an hour or so before turning it over.
 
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