Well you could check the main wiring harness where both sides come together look for any damage in it. Hard to belive you got multiple cop failures new and all. try switching the coils to. But only do one thing at a time..

 

switched injectors 1 with 3, no change still getting codes on 3 and 7! Almost died this morning in startup (31 degrees outside), turned off and back on ran fine rest of the day. Anything else I can try before compression test? If not gonna have to go to dealer, I dont have a clue how to compression test the cylinders! Also had already tried moving COPs didnt help.

 

Anybody gotsomemore ideas on where to go next? Ive tried moving fuel injectors, COPs, cleaned sensors, and pins from PCM connector to COPs. Noticed today instead of getting both P0357 and P0353 at same time I got one in the morning and one in the afternoon. Please help out any ideas would be helpful!!!!!!

 

Compression test the engine. Have to do them all if 3 & 7 have compression. Start with those. Obviously if they have zero your done but if they have compression get an average. Make sure they aint out of wack. Youll be able to inspect the plugs while your at it.

 

Well, I took my truck to a local mechanic a buddy knows. He put 2 used Motorcraft COPs in cylinders 3 and 7. Next morning threw codes P0354 and P0358! Anybody have a clue why! Is it that the COPs are weak and when he changed those it moved to the next one that is weak? Gonna put Motorcraft on those and see what happens! P0353 and P0357 didnt come on!

 

Buy a full set of cops on Ebay, they are about $80 shipped for ALL 8. Search for "DG508" and buy them from Global or Uneek.

 

Just wanted to post that last week I took my truckto a mechanic and he changed the number 7 and 3 COPs, the next morning I got codes P0304 and P0358 so I changed those too. Glad to report that truck has been running great again for a week hope this fixed it! PS AutoZone COPs suck!!!!!!!!!! Not gonna buy electrical parts there any more gonna go with Motorcraft! Thanks for all the help!

 

The e-bay coils you were told about cost as much for a set as one new one from just about anywhere and they work great I have them in my van no issues. You should buy a whole set of them and replace all those you bought.

 

I had an issue similar to this one.

I had an intermittent coil misfire on my 2000 F150 (5.4L) 108K miles. It was on the #2 cylinder, code P0352. Upon start up, usually in humid conditions, the engine was idling rough. Usually, I could correct it by simply turning off the engine and restarting it. Occasionally, when this would not work the first time, I would get codes P0352 and P0357 simultaneously (#2 & #7 cylinder). (Of course I would clear the codes as after each time to keep track of the faults.) I repeatedly tested the coils and found the primary and secondary resistance was nominal (1.5 Ohms and 5K Ohms).

I noticed the #2 & #7 ignitions coil driver circuits were next to each other on the PCM (power control module).
1. So I removed the battery, battery holder (to gain access), removed the PCM connector bolt and unplugged the connector/wire harness from the PCM.
2. I inspected the socket pins on the cable and the pins on the PCM. The pins were not bent and the sockets were not plugged, loose, or recessed in the connector. I did, however, notice (thin and viscous) yellow/orange fluid all over the connector matting surface.
3. I carefully cleaned and blew out the PCM pins and connector with compressed air.
4. I applied dielectric grease (from auto parts store) on the PCM pins and connector matting surface with a clean tooth brush.
5. I carefully reassembled everything.
Note: After battery disconnect, the PCM will go through a “relearn process” to optimize engine performance. Your engine idle and transmission shift points may seem different for the 15 – 20 min of the relearn process while driving.

I have not had this daily issue return. No codes for 1 month so far. Gas mileage and engine performance is remarkably improved.
Try this first before PCM replacement ($$$$) or coil replacement ($$), especially if it is intermittent in nature and repeatedly confirmed with coil misfire codes (P035*) and no coil defects.

 

Thank you nhartwell !!! I was just about to start a new post about this code (actually P0171, P0303, and P0353) that I started getting after changing out my passenger-side plugs on Sunday night. (I replaced the other side a couple of weeks ago). The truck was running fine on Saturday and after changing plugs on Sunday it started throwing these codes. I bought a new COP from the dealer Monday (for the P0303/P0353) and still got the codes. I have been racking my brain, and google/other sites, trying to figure out how this could happen with a simple spark plug change. I had to unplug the PCM in order to get to the #4 cylinder so I'm guessing/hoping that cleaning the plugs and pins will clear the problem. I have already thoroughly cheched for cracked lines and wires to no avail.

I'll report back tonight or tomorrow.

Thanks
Jim

2004 FX4 5.4

 

Make sure your using dielectric grease on the cop boot ends. There may not have been a miss fire in the cop prier to removing them but in the process of the change, going back in they're not making a proper connection.

 

Not on the ends, that's how you end up with bad contact and a miss. You want 100% contact from spring end to plug. Best way is to grease the plug porcelain/ then entire inside of the boots/ pull the spring from the boot end and and hold, hit it w/lacquer thinner,let go so that it retracts back into the boot. - Twist the coil back down onto the plug. Your protected and you have positive contact - coil to plug.

I made a short video of that , -somewhere.

 

Thanks guys. I had time between work and Little League to at least drop by Autozone and get a couple of cans of grease and some electronics cleaner. I'll get after it tomorrow after work.

BTW, #3 is the cylinder that threw the codes to begin with so I bought the new COP and replaced it and threw the same codes again. Kind of strange to not get a good connect on a brand new COP. At this point, I'll try whatever

 

"Cans" of grease? All the dielectric grease I've seen has been in tubes.......

 

I've bought it in a can before..