suzuki vitara 1.6 engine problems ?

[vitara mad]

hi all
i have had my vitara for about 2 years now and about 4 months ago it cut out on me and there was all black bernt fuel on the plugs and the head gasket had gone so i changed it all over and then it kept on putting black bernt fuel on the plugs and after i clean them each time it runs fine for a bit then it loose power and then i leave it for about 10 mins and come bak to it and it runs fine for a bit then dies wen frottle gets put down but ticks over fine ?
i have changed the plugs and tested all the fuel can anyone help on my 1.6 carb
thanks ?

[twiss]

usually this isnt the case, but have you checked the auto choke is working properly?
im assuming the is a carburettor model rather than fuel injection

its a common issue on the 413 and samurai, as the auto choke system is prone to failure
try taking off the plenum chamber (bit that bolts on top of the carb) and run the engine up to temperature
the topmost butterfly valve in the carb should be closed when cold and gradually open as the engine gets warmer.
if the choke is stuck closed all the time, this would make it run super rich once it has warmed up.
this would explain that it dies after 10 minutes of heating up, and the sooty plugs

[vitara mad]

cheers mate thanks for ur help and i checked the choke and that wasent it so sent it away now cheers

[twiss]

try and get a replacement ignition coil for it... mine was doing something similar recently, when the coil got warm it would run out of juice
might be worth borrowing one off a mate to test it