01 F-150 Code P0354 - cause bad PCM?

DougFunnie13 · #1 11-06-2009, 09:07 PM

About a year ago I replaced the COP on cylinder #4 after the code came up that it was missing. Then about a month ago the truck start running awful again and the engine light comes on with the code P0354. I ordered a new COP from global automotive, but this time changing it did not get rid of the problem. I took the truck into the mechanic and he said the COP boot was too long and not making contact with the plug and needed new plugs and COPs (which I definately do) But here's my real issue, he said that one of the the COP's had backfed and fried a quad in the computer. Is this possible?? I need to make a decision after the weekend...

Register today or sign-in to remove these ads!

jethat · #2 11-06-2009, 09:34 PM

I'd change the plugs and get the right coils (DG508's for an 01) then see how it runs. I've never heard of that happening but you never know.

jbrew · #3 11-07-2009, 02:16 AM

Who knows what you installed there. Sounds to me like you shouldn't be the one ordering parts for your vehicle lol.

Never heard of one back-feeding, but only you know what you did, well maybe?

DougFunnie13 · #4 11-07-2009, 09:04 AM

I installed a global automotive COP that was suppose to be for a 2001 F-150, but I think he sent me the wrong one. But the one I replaced a year ago seemed to work fine for about a year and then started missing again.

jbrew · #5 11-07-2009, 05:08 PM

Yea, we need more info. Like a part #. PO354 is total primary failure. #4 is a dead hole. And thro #1 coil into #4's slot for now. Ignition integrity plays a roll with these trucks IMO. If a coil fails within an aged system, the rest soon follow suit.

What to keep in mind:

Although replacing all coils in a dedicated COP system is advised, like all electrical components, there's still the chance of getting a bad one out of the box. Coils are so cheap from the RIGHT distributer, ordering their 10 packs can pay off. Mishaps happen, so it's nice to have a few spares.