I have a 2001 Super Crew 4x4 with a 4.6L with 134,000 miles. I purchased the truck new in May 03 with 32, 000 miles. Since I purchased this truck, I have replaced 5 coils. I usually replace them myself unless it is one of the 4 rearcylinders. Today makes #6 (And the 2nd in 2 months). At $55 each (When I replace them myself $200 If someone does it for me), it is getting stupid having to replace a coils every year or, in this case 2 months. Does anyone know why they keep going out? Is this common?

 

Buy your coils from Global Automotive on Ebay and replace then all at once, less than $100 for all eight.

 

I will check it out. I have already given some thought into replacing all of them at once. Any idea why they keep going out?

 

Why they keep going out maybe someone else will chime in, but, from my expierence with ford, if one goes, the others will soon follow.

Thats why I always replace them all at once.

 

I had been thinking about it but I hate to replace all 8 and then they start up again in a year. Before I do replace all 8, I want to make sure something els is not causing the problem. Better safe that broke!

 

Are they going bad or is it a miss fire? If you not putting the grease on the plug to COP boot you could be getting arching. That can burn out the COP.

 

If you wash your engine, that can do it too. You should also be using OEM Motorcraft or certain high performance aftermarket plugs (such as Denso Iridiums). Autolites and Bosch aren't worth a p00p in these engines.

 

I only use Motorcraft plug. I have not had much luck with aftermarket in the V8 models.

 

When I do them, 4 out of 6, I do put the grease on the inside of the boot. The code says miss fire.
When I had the plugs replaced, they (A friend that owns a garage) used the Ford Motorcraft plugs.
I do not wash the engine but I do go throught an automatic car was that has the under carriage wash, I went through yesterday morning.

 

I just notice your location. You have had alot of rain lately. I had the same problem and found a bad seal. I am not sure if you have this on your model but here is what I did.
Pop your hood. Just infront of the plastic grill in front of you windshield there is a rubber seal (like your door seal). I found dirt and leaves under it. So every time it rained or I washed my car the water ran on to my engine. I cleaned it the I ran a beed of black RTV under the seal to prvent anything from getting under it. No issue since.
I know have an 01 Expedition and it has that seal but the seal fits over a plastic channel so that does not happen. Check that area. Maby its cracked or the vent in front of the seal has plugged drains. I found mine by popping the hood and running water down the windshield. It does not take much water under the boot to start it.

It coud be from spraying under the truck in the car wash if you are missing some of the splash pannels in the wheel well.

Hope this helps

 

Before I forget, Thank You to everyone that has responded.
I will check the rear hood seal. I do know that I made sure everything sealed good when I replaced the windshield wiper unit about 2 years ago. But, it started burning out coils long before that. The 1st set was at about 40,000 miles. Also, All of the splash panels are intact and anchored well.