gord's truck

I have a 99 f150 with a 4.2 and its been dead for 2 days. it stutterd a couple times about a week ago and just died while I was driving it[not hard]. I have tried everything, new cam and crank sensors, its got 40lbs fuel pressure, pulse in the injectors, spark but nothing I do fixes my problem. I have tried so much I now have gas in my oil, anyone have any ideas, maybe re and re the motor, it has 260k but im not sure if its electrical or motor, please someone help

Marc D

Try doing a compression test. If you have any less than 100psi in any cylinder it's probably going to need a rebuild. Also the 4.2L is known for intake manifold leaks that can prevent proper fuel mixing and even water in the cylinders. You would have a P174-P171 codes in this condition.

gord's truck

thanks for the input, ill give it a try