Misterjaydogg

I have a 2002 F150 with the 4.2L 6 cylinder. I have replaced the coil, plugs, plug wires, fuel filter, air fliter and, crank position sensor but I am still getting a missfire on cylinders 3&4. Any suggestions on what to do next??

By the way the truck only has 72,xxx miles on it

sharptp

Check Engine light on?

cisco779

I have the exact same issue now with the same cylinders, has anyone been able to correct or answer.

bradseabridge

wow, back from the dead.

But that's good, thread necromancy is encouraged here. It means you are properly utilizing the search function.

jgreene551

I have same issues, changed plugs, coil pak and wires along with upper intake gasket. loss of power under any load. Seems to idle fine just a little rough but will rev up. Going up a hill al power is lost when gaving it gas. No answer yet.

papa tiger

Plug in a OBD II code reader and document the codes, then navigate the reader offerings and document the different pages. You can find out a wealth of information in 1/2 hour that will take you hours to try to find anyother way and save yourself a ton of $$$

AMSOIL-F150

I'm having the same problem with my 2005 4.2L.
Ive replaced coil pack, wires, plugs and still no luck. Anyone find a answer to the problem yet?

Mr.Bones

try a smoke test, the 4.2 intake has a problem with the seals going out on the lower intake. it will cause it to run lean and bank and in some cases if its bad it will act like a miss mire. my 2001 4.2 did the same thing. a smoke test will show if there is any leaks in the intake.