Misfire issue

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Jul 6, 2024 | 10:46 AM

freebird63

Thread Starter

4wd High

Joined: Oct 2013

Posts: 9

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Misfire issue

I have a 2007 Ford F150, it has around 245,000 miles on it. Did the camphaser delete. My mechanic has replaced all the sparkplugs and coil packs and I'm still getting misfire on start up and misfire on cylinder 3. I know I need a new engine, but am short on the money end.
Any ideas as I'm not a mechanic??

Jul 6, 2024 | 02:06 PM

Johnny Paycheck

Fleet Mechanic

Joined: Jul 2019

Posts: 1,317

Likes: 314

Did you get the tuner with the lock out kit?

You definitely need that or the engine will run…like it is now.

Jul 6, 2024 | 04:42 PM

freebird63

Thread Starter

4wd High

Joined: Oct 2013

Posts: 9

Likes: 0

Misfire

Yes the tuner has the lockout

Jul 7, 2024 | 07:48 AM

techrep

Cargo Master

Joined: Sep 2023

Posts: 2,822

Likes: 276

From: Virginia Beach

What brand plugs and coils were installed? what is the specific DTC code for the misfire? was the injector swapped? I'm assuming you have a 5.4l 3v.

Jul 7, 2024 | 09:18 AM

RLXXI

Lead Driver

Joined: Nov 2020

Posts: 7,128

Likes: 1,945

From: Sportsman's Paradise

If he used Autolite plugs, you now know what the issue is. You need a new mechanic.

Jul 7, 2024 | 10:42 AM

freebird63

Thread Starter

4wd High

Joined: Oct 2013

Posts: 9

Likes: 0

Ford motorcraft plugs and coil packs. The two codes are PO303 and PO316

Jul 8, 2024 | 02:34 AM

techrep

Cargo Master

Joined: Sep 2023

Posts: 2,822

Likes: 276

From: Virginia Beach

Swap plugs with another cylinder clear codes, see if that 303 follows. you may have a bad plug. they get dropped and the porcelain gets cracked. or you can just replace the plug and see if it clears.