I need some help guys. Here is alittle back ground info.

2002 5.4 with 77k miles. Supercrew

I noticed a miss in the truck yesterday. Well after 3-10 miles it has gotten worse. Ran the code scanner and it gave 3 codes. Cylinders 1, 2, and 3 misfire detected. Any ideas? I hope it is just the spark plugs but can one plug give off 3 misfires? Thanks alot.

 

Since its the three front cylinders on the passenger side I would check the wiring harness to the injectors and be looking for something common in that area. Take a look and let us know what you see if anything.

 

Did you get your motor wet by chance?

 

Three cylinders all going at once all nearby each other likely indicates a local problem, most likely electrical.

Look for any melted wires that may have slipped out of the harness or anything that looks "out of ordinary" or out of place.

If everything looks alright, likely the coil packs are gone, they tend to go all at the same time(one blows, usually one or more follow it soon after) and that was a known issue on the 5.4.

If you end up replacing them, replace them all. You'll save yourself time and money down the road.

 

He has COP's - every 5.4L has COP's not coil packs , 4sixes sport coil packs(2) before 2001

COP's = 8 coils

Coil Packs = 2 coils

 

Thanks guys. I will be looking into it tonight. I will start with Motocraft plugs and see where i end up at. I havent got anything wet under the hood. It hasent rained and i havent driven the truck in 2 weeks before all this happened. I will post what i find.

Can 1 plug make the cylinders around it throw codes?

 

UPDATE:
I put in new plugs on the passenger side. It ran fine for about 10 miles then it started missing again. I pulled the plugs to check for antifreeze in the cylinders and found nothing. Check the compression found nothing. Put it back together and it now runs fine. I dont get it. Any help out there?

 

The PCM needed a chance to relearn the new perameters?

 

I will be driving it about 50 miles to work and back to see how it is going to do. I am lost on this one.

 

Geezz, alls I can say is this is a strange case - a funny way for your COP's to go out. Maybe something was done that hasen't been mentioned to your motor. Did you by chance do any work on it with the battery connected and grounded against something in the engine compartment?

Well Idunno but it sounds like you have a few coils that are history now.

Since you can aquire COP's fairly cheap (I'll post the link) , I would start with a fresh set and use Motorcraft plugs under them. That will most likley cause your problems to go away.

Make sure you use Dielectric Grease inside the boots and at the seams of the boot so you won't have any problems in the near future..

You can purchase a hole set of new COP's here for under $100.

http://cgi.ebay.com/ebaymotors/NEW-I...mZ160111254456

Good Luck

 

I would inspect the COP boots;sounds like a HV "tracking" problem. Get some replacement boots from Autozone,Advanced Auto,or Napa. BEFORE replacing the boot,fill the boot with dielectric grease to prevent arc,or grounding problems.

 

1999 was the last year for coil packs for the 4.6 in the f-150. My 00 came with COP ignition. Made the 5.4 swap a piece of cake.


Check the radio noise capacitor on the passenger side. It is the gray plug on the COP harness. Make sure all the injector connectors are properly seated.

JMC

 

Well i drove the truck 50+ miles and it is still running good. I have a scanner inside the truck so when ever it decides to throw a code i will check it out. But intill then every drive is a test drive. .

 

I thought COP was an abbreviation for COil Pack, whatever, I don't have either.

Good ole spinning rotor for me.

 

COP= Coil On Plug