My Daughter's 2000 F-150 Crew Cab 4x4 with a 5.4 keeps burning out the #5 Cylinder Coil pack. Have changed out 3 in the last 4 months. and the truck just started missing again today. The last one was change out, the Ford Tech. said he put on the test machine and found out he needed to replace the Elec plug for the Coil pack. After replacing the Elec Plug, Coil pack & the spark plug for the #5 cylinder the truck ran fine.
Anybody that might know what the problem is please let me know.
Who is telling you that the COP is bad? The Ford Tech? If that is the case, I question whether the COP has been bad each time. Are you getting a code and checking it yourself? If you're not getting a code and it's missing right now, I question that its the COP as it usually spits a code rather quickly, or at least it does on my 2000 E-150 5.4.
Also, did they replace the boot between the COP and the plug? I guess there's been problems there too.
Are they doing this under warranty too? I know the ones I buy at Advanced are 1 year warranty. Of course I replace them myself.
I can't think what would cause a COP to go out so often, especially after replacing the connector and plug. I also don't believe the connector was bad the last time. If it was melted or corroded, then maybe.
If I were you, I'd swap COP 5 and 6 and see what happens, but that's only if your getting the P0305 code or P0355. Then see if it changes to P0306 or P0356.
I had a strange one recently where my water froze and the engine overheated and went into limp mode. Once it was back to normal, it was missing and coded a P0308 and it had blown the #8 COP. Not sure why that happened but a new COP fixed it right up.
It codes for the # 5 each time. Replaced the boot every time. The last time it was checked at the Ford dealer and they changed the Connector plug, COP and the spark plug. The other times it was checked by a Ex Ford tech using a Snap-ON unit. Each time you can see on the side of the COP where it has burned or over heated. A spot that is about nickel. The ones were from NAPA.
I'm no NAPA fan, but I'm sure the problem is not with their product. If your purchasing them though, they should be warrantied for one thing.
Why it is happening is strange. It's hard to know without seeing it but it almost has to be from something overheating it. I guess I would fabricate some kind of heat shield, specifically on that side where you see the burn mark. Seriously, if you are seeing a burn mark, something must be near there that is very hot, and it shouldn't be.
I've replaced 3 or 4 COPS on mine and I never saw anything visible that was wrong with them. I even checked a bad one with an Ohm meter and it gave readings similar to a new one.
With my 2003 f150 there seems to be a relationship between wet weather and the coils going out..first time i parked the truck on a downgrade overnight with some snowfall and rain #5 coil went out. Yesterday driving up a grade in heavy rain #8 goes out with some water sitting around coil. Lesson..don't drive a piece of **** ford in the rain!
Yes there is a definate relationship between wet weather and coils, and interestingly enough, I too park in a downward slope which i thought to be a contributing factor in this problem. I just got done replacing #8 coil on mine this weekend after heavy downpour of rain this past week and got the P0308 code. I did some research on this and it seems many have this same problem during rainy seasons. Here is another thread where the owner took it a step further and actually ran some water down the windshield to watch exactly how the water drips into the engine area and sure enough it drips right on the driver side bank of coils
I have an 2000 E-150 van with the 5.4 and the first coil went out last December and this December 2 more went out and last week another went out. I bought the van new and the coils went out from 98,000 to 103,000 miles.
I replace the other 4 this last time. I was told this has been a big problem on that engine.
My 2000 Ford 5.4 was doing the same thing about 100,000
miles and had to replace a coil. (This engine has 8 coils.) The
next year 2 more were bad and 6 months later another 1
went out so I had them change the other 4 to.