Misfire issue

Reply Subscribe

Thread Tools

Search this Thread

Jul 6, 2024 | 10:46 AM

freebird63

Thread Starter

4wd High

Joined: Oct 2013

Posts: 9

Likes: 0

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: 1,306

Likes: 310

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: 2,743

Likes: 273

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: 2,743

Likes: 273

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.

Trending Topics

64 and 63 f100 4x4s

44

1k
BREAKING: Ford Drops 6.8L V8 and Standard 6.7L Power Stroke from 2027...

231

17.3k
Looking at ordering an F-250. Questions on what I should be able to get...

25

830
Death Wobble Help

23

342
This is prolly a 1 page thread at most

110.1k

6.0M

Jul 8, 2024 | 08:28 AM

redfishtd

Fleet Mechanic

Joined: Apr 2016

Posts: 1,653

Likes: 193

Clean the tabs on the cops , agreed move plug to another cly . Then swap cop and boot . Then swap injectors if that didnt find it . Look at mode six to see all raw computer counts per cly you want zero counts towards setting a code .
There's lots of counterfeit plugs out there. I am on my third set of injectors at 270k miles. Last one had number 2 shooting a solid stream all the time.
Make sure no fluids getting in spark plug well.