502 mag with black smoke?
 

I get black smoke when i start the engine when it`s hot?

is it posible to take a diagnos on a 1998-1999?

Black Smoke Is Fuel

Carb or EFI?

Is it black or blue? If it's black, then it is more than likely fuel related. If it is blue, then it is probably oil. If it does it when its hot more than when its cold, it is probably valve stem seals. How many hours on the engine?
Eddie

its a mpi

Only when it`s hot, i need a litle throtle when i start it when it`s hot, 350hours, do i need a service on the heads?

it looks black

ideally when you start an injected motor you do nothing at all except hit the switch. the ecu does the rest. on a lot of these motors when they are hot the fuel in the fuel rail will boil and make it hard to startwhich, by the time you are done screwing around moving the throttles and confusing the hell out of the electronics, they will end up rich for a few seconds and do what you see but after a few seconds it should be gone. if it isn't then its something else. what i preach is that when you are coming off plane and doing your low speed approach to where you are coming or going that you crack the hatch as you go along for a few minutes and get some air thru there. that gets everything back close to ambient and the intake manifold cools off to somethng less than the surface of the sun. that makes everything much much better when you try to leave an hour or two later.

Good info right there ^^^^

You should not need to touch the throttles. It should fire and idle perfect with a turn of the key.

somthimes i need full throttle to start it when it`s hot, when it`s cold i dont need any throttle.

i stop the engine in 1sek and then start the engine, it`s hard to start, then i need throttle, the fuel is not hot after 1sek stopp

Is it posible to check it with a computer?