Why is your 1999 ford F150 white smoke from pipe?

Answer 1

Hey there

You did not mention anything about overheating, coolant loss or your transmission

shifting funny. I mention these because white smoke out the tailpipe usually means there is coolant leaking inside the combustion chamber

inside the engine or there is automatic Transmission Fluid

leaking inside the combustion chamber.

The first thing I would look for would be is your radiator low on coolant? If so, I would get a cooling system pressure test to determine if there is an internal coolant leak in your engine. Blown head gaskets are the first thing that comes to mind here and this pressure test should reveal this to you.

If you do find you have a blown head gasket or some other internal coolant leak I would recommend you try this over the counter product first before you spend any big bucks overhauling the engine.

If the pressure test determines the coolant is not leaking, then you might want to see if your transmission is equipped with a vacuum transmission modulator valve on the side of the transmission.

This valve will have a rubber vacuum line attached to it, if you remove the vacuum line from the valve and transmission fluid comes out you need to replace the transmission modulator valve.

If you suspect an internal coolant leak like a head gasket problem try doing this FIRST

Blown Head Gasket