Hi everyone, sorry if this belongs in v8 engines. I have a 2003 5.4L F150. About a week and a half ago after I went off roading I decided to degrease the engine. Bad Idea.
It threw the code po308 misfire cylinder 8. I changed the COP on cylinder 8 and still the misfire. I read the code again and now I had po307 and po302. I changed all the plugs except for cylinder 4 (didn't have the right extensions and U-joints) and I replaced the COP on cylinder 7. I also pulled all the COPS and put di-electric grease on all of them.

After all of this I went for a test drive and everything seemed great. The next day it misfired a bit while it was still cold. After the truck warmed up, it seemed to be fine. I have no codes currently, but I can tell the truck is misfiring a little bit mostly when the truck is still cold.

Can anyone give me some good advice? Thanks a ton!

 

how many miles?

you're probably due for a whole set of COPs

 

Full set of cops is about 80 bucks on Ebay. Search for DG508 and buy them from Global or Uneek.

 

And these will be what you find, - just get the set and keep your newer ones for spares -

http://cgi.ebay.com/ebaymotors/NEW-I...Q5fAccessories

 

Might check all the connectors for the cops. Unplug and blow em out, sounds like a water problem afthe the bath.
My $0.02

 

It is lol, coils are most likely spent tho. Sometimes you get lucky cleaning them up, but most of the time you shear to many windings for them to come back.

 

If you piece-meal it, it may take some time to get hold of mutiple problems.
A boot may now have a pin hole even if the coils and plugs are good.
With a good scanner (not just a simple reader) that can record live data you can see the bank the issue is on, then narrow down from there.
More than one problem at a time is hard to handle until you realize you have them.
Only time I ever wash down a motor is after all the coils/boots have been cleaned and sealed with die-electric grease at the boot "lip" that sets on the head as the best chance you will get to keep water out. Then there is still no gaurrentee until the motor is run a day or so to see if a problem develops.
Coils are the biggest sore spot with these motors that should have had shields and cooling around the coils.
Years ago, the old straight 6 went FI and actually has one injector that had cooling efforts around it because it was located in a hot spot on the motor.
Good luck.

 

2000 f150 5.4l Getting ready to replace COP on what's supposed to be #4. Going to buy a set on e-bay. Would you folks recommend relplacing the whole bank of 4 while there? Where's #4. Can you point or post a map? How does one check condition of those COP's removed to keep as spares.

Thanks,

ricochet

 

#4 should be rear most passenger cylinder

 

i thought it went 1,3,5,7 on pass side and 2,4,6,8 on drivers side if standing at the grille looking at the motor???

 

 

I like the last answer better but can I get a consesus for sure. None are easy it may make a difference whether I just pull stuff out of the way or attempt the one COP with a little pain.

Thanks in advance.

ricochet

 

Thanks all. Just saw the last message.

ricochet

 

ohhhh....thanks.

 

Here's one with better cylinder circles. Patrick was a little drunk when he gave those a shot.