2005 ls wont start

[305nole]

hey joe i checked the wire and the connector and they seemed to be ok and not being pinched. you think i should go ahead change coil 1? if i should, could i use the same gaskets or buy new ones? i put 21 miles on it so far.

[shorod]

What I would suggest is to swap that coil with another one, in this case one on bank 2 since it's easier to get to, and see if the code follows the coil or stays with cylinder #1. A replacement coil is around $55 at O'Reilly Auto Parts. When I bought coils for my 2004 V8 from O'Reilly they came in BWD boxes but they all had Motorcraft stickers on them with Ford part numbers. In 2002 the intake manifold gaskets were reuseable, the factory service manual says to inspect them and replace if necessary. I would imagine the same holds for 2005.

-Rod

[joegr]

Yeah, I doubt that it is the coil. The advice to swap the #1 coil with the #4 (or 5 or 6) coil is good. I would do that as the next troubleshooting step. If the code moves to #4, then it is the coil after all. If it stays with #1, then it's back to looking at the wiring harness. If if goes away completely, then the connector to the #1 coil would be a good suspect.

[305nole]

thanks for all the help guys. i went ahead and just replaced coil #1 and it seemed to fix the problem. only thing now is that it seems to struggle up hills sometimes, but its not a real problem.

[305nole]

hey guys my problem came back. after i replaced coil #1 and #6 it fixed the problem for about the first 200 miles. then between miles 201 - 1100 (trip to miami from tallahassee and back) it started acting up, it seemed to be misfiring again at idle and while accelerating. mile 1101 error codes came back P0306 and P0351. do you think its the valve cover gasket (i think i remember this from another thread i searched). mileages are rough estimates. hey rod do you think you can send me that pdf repair manual for the 2002. thanks.

[shorod]

Valve cover gaskets on the 2005 are typically not a common problem. They fixed the typical issues somewhere in the 2002 timeframe.

I'd suggest you try moving the coils around as suggest above in post #32 to confirm if it's a coil issue or a wiring issue to the coil.

-Rod

[305nole]

hey rod i put new ones in already and it fixed the problem for about 200 miles, then the problem returned. let me recap everything: 1. P0353: replaced coil #3 (my mistake earlier i said #6) code went away. 2. P0305: replaced coil # 1, code went away. after 200 miles the engine would sometimes rumble at red lights and loss of power during acceleration. then after about 1000 miles both codes returned. thats why i think there's something that's making them go bad. i visually check all the wiring and everything seems fine. any suggestions on what would make the coils go bad?

[shorod]

Which is why I'm suggesting swapping those coils with other cylinders. If the coil is bad, the code should quickly show up on the cylinders you swap the coils with. If the problem is wiring to the coils or a problem with the fuel/compression, the codes will remain on 3 and 5.

Why did you replace coil #1 for the P0305 code?

-Rod

[305nole]

sorry i made a mistake again. the code was P0351 then i replaced coil #1 and code went away. also after the codes reappeared my battery began to die. so i brought a battery and i know the codes disappear when you disconnect the battery so now i waiting on them to show up again. instead me having to go back in and remove the manifold to swap them, can i just put my old coil that i replaced, into cylinder 4 and see if it shows a bad coil in #4?

[305nole]

i'm sorry i made another mistake. P0306 and P0351 showed up a 1000 miles after i replaced coil #3 (P0353) and coil # 1 (P0351). so the P0351 came back and P0306 is a new one.