04Beast

Hello, I am looking for some help. My 04 f150 5.4 started running rough, with no light on. Then on a long trip the light came on. I replaced a coil pack on Cyl 8 after diagnosing it with my dad. I did this by disconnecting a coil pack at a time then starting it up to see if there was a change. We replaced number 8 ran better for half a day. Then on the way home I replaced 4 more coil packs and then switched out the others with the ones I replaced due to no change. No change. I stopped by the garage they pulled the codes; P0010 Intake cam pos Acc circuit open bank 1 open, P0020 Intake cam pos Acc circuit open bank 2 open, P0174 system too lean, P0308 Cyl 8 misfire, P0316 Misfire on start up, P0353,P0355,P0356,P0357,P0358. The P0353-P0358 are all the exact coil packs that I replaced. I was thinking to change the plug out on Cyl 8 or all of them. The plugs were redone at Ford dealer 60k miles ago by my dad as he was the only previous owner. Any insight or recommendations if I am headed in the right direction with switching out the cyl 8 plug/plugs? Any other recommendations, Thanks.

04Beast

I see 63 people have taken a look...any recommendations?

Eric Kleven

Are all those codes related to the same run of the wiring harness? If something went janky in there.... good luck my friend.

souped

Ford recommends installing a new plug when you change out a bad coil , I have to agree this is the best plan . Make sure you use the proper dielectric grease on the boot tips to prevent arcing .

04Beast

Thanks Souped! and Eric for your input. The plug in cylinder 8 had gone bad. Replaced it and it cleared up everything.