2002 5.4l misfire help
10-08-2016, 01:02 AM
#1
2002 5.4l misfire help
I changed my intake manifold and now it's misfiring. The code is p0352 I changed all the spark plugs with motorcraft. And got new accel coils on there. I would greatly appreciate any help! 😫
10-08-2016, 01:12 AM
#2
Senior Member
I'd reinstall your good coils. The accel's are cheap china knock-offs and don't have spec build magnets and hardly any thermal protection. Should of came here before wasting your money. Yea, just throw a good one on there. When you purchase cheap coils like that, chances you'll also get a dead one right out of the box. Other than that, the truck may run on them, but it won't run as well it should.
10-08-2016, 02:14 PM
#3
Senior Member
Totally agree on the Accel coils being crap on our setups. Motorcraft or bust. lol
Here is a link to help you run down your problem.
https://www.obd-codes.com/p0352
Here is a link to help you run down your problem.
https://www.obd-codes.com/p0352
10-08-2016, 02:20 PM
#4
Senior Member
X3 on ditching the Chinese coils. The modular engines in these trucks don't like it when you go cheap on ignition components.
03-03-2019, 07:49 PM
#6
I took it to the dealership to they said that cylinder 1 is out. Not sure why but they would charge me 1,300.00 to tear into the engine. I told them no thanks and took it home. I figured I could buy a used engine for that price. So I researched the net and found a video on a earlier f150 model where the guy tapped the valves that where seized. So I took the vavle cover off and found the rocker over cylinder 1 below the crossover leak sitting on the bottom. I put it back on. But It felt loose and I thought If I put this all back together it would just pop off again. I then sprayed wd40 into the valve and rotated the crank a couple times and then rocker felt solid. So I put everything back together and it was smooth, no misfire anymore. I think when the coolant was leaking into the clyinder and somehow seized the valve and the rocker popped off thankfully. It runs good now.
03-03-2019, 08:02 PM
#7
Senior Member
Yep, loosing a rocker will cause it misfire for sure. It happens, just a little less common. A compression test would have hinted to it. Good job, thanks for posting the resolve.
Last edited by Jbrew; 03-03-2019 at 08:45 PM.