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2002 4.2L misfire

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Old 05-17-2010, 01:29 PM   #1
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Angry 2002 4.2L misfire

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
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Old 05-18-2010, 11:48 PM   #2
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Originally Posted by Misterjaydogg View Post
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
Check Engine light on?
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Old 07-13-2011, 01:12 PM   #3
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Check Engine light on?
I have the exact same issue now with the same cylinders, has anyone been able to correct or answer.
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Old 07-13-2011, 01:19 PM   #4
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wow, back from the dead.

But that's good, thread necromancy is encouraged here. It means you are properly utilizing the search function.
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Old 01-09-2012, 05:14 PM   #5
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Default same

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.
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Old 01-11-2012, 12:59 AM   #6
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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 $$$
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Old 04-18-2012, 02:31 AM   #7
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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?
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Old 04-19-2012, 01:22 PM   #8
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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.
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