Hey all,

I am fairly certain that this topic has been touched on more than enough times on the site, I would just like some honest thoughts and ideas.

I have a 2005 F150 Triton 5.4 with 84,000 miles.

Some time ago, I had a spark plug go out and cost me a pretty penny to replace. Took the mechanic nearly 2 days to ease the 2 piece plug out of the head to prevent breaking. Successful completion with the removal of the cylinder 6 plug, and my truck ran like new!

Say a month ago, she started runnin' rough again, check engine light came on and started to flash and she back fired (same situation). I hooked up the code reader, and to my surprise, it was not the plug, but cylinder 6 ignition coil. (same cylinder I had the plug replaced in) So, I gladly went to shop and bought a coil and replaced the junked one, cleared the code, and she ran fine. In the morning, however, she went right back to junk.. cylinder 6. I switched the cylinder 6 and 4 coil around to see if it was the coil, but still called for cylinder 6 ignition coil.

With the story aside, my truck runs fine after a short drive, but after letting her sit over night or for a good amount of time while I am at work, she runs rough until she warms up a little bit.

I have spoken with other 2004-2007 owners, they joke with saying, get a new motor, $3400 installed from so and so, or replace the plugs and coils and even replace the phaser, cams and chains (makes some noise in my truck, but not like other trucks I have heard)

So, any suggestions? New motor? plugs and coils? or could it be the cam phaser?

Any help will be great, Thank you!

 

You need to fix that injector before you do need a new motor.

 

HIGHLY suspect the injector:

https://www.f150online.com/forums/v8...ram-07m08.html

However, at 84k you need to change the rest of the plugs. It *IS* possible the new plug has issues.

 

Ok, thank you,

I dropped some injector cleaner in with my full tank of 97. See how she runs through out tomorrow!

As for pulling the plugs, I have already dropped an investment on a tool from Ford, an easy out plug remover, whether it be broken or still intact, it will remove the plug. So with that being said, I hope the injector cleans up long enough for me to get all new plugs, coils and injectors! -Nice weekend project!

Thanks for the help guys, I appreciate it!

 

That will make it worse, since a dirty injector isn't the problem. Read what glc posted before its to late. Yea, cleaner might make that problem a worse one. You could lock that engine up. Just replace that one injector for now, -don't take any chances.

 

*IF* you have a stuck injector, it won't cost you ANYTHING for Ford to replace it and fix any collateral damage. Read my link.

 

Yea, the injector is leaking into that cylinder after shut down. The residual fuel pressure is enough to make all that happen via weak/stuck injector. So upon restart, that residual fuel is fouling that cylinder as soon as the engine cranks.

Once that happens and the cylinder doesn't fire, the pressure in that cylinder due to the unburnt fuel that resides, may lock the motor. When that happens, you'll most likely need another engine.

I wouldn't waste any time...