Ford F150 2001 4.6 SuperCrew.

Started noticing a knock or stutter only when the engine is up to temp and driving. I took it to the dealer and they put it on the scope. They tell me that COP #4 and #7 are bad but I can't figure out what cylinders are 4 & 7. The following diagram is how I believe the cylinder order to be:

firewall

8 4
7 3
6 2
5 1

Bumper

Can someone tell me if this is correct???

THanks,

Mark Norton

 

no you have them flopped

4 8
3 7
2 6
1 5



4 is famous for failing!!.

by the way welcome to the boards where in texas are you?

 

Thanks brahmus,

Then I changed out coils on 3 and 8 yesterday.

The problem got better but did not go away. I suppose that the next thing to do is to change out 4 and 7 with the ones that I took out yesterday.

Thanks again,

Mark

 

check the boots really good. sometimes they get very small holes and arc through the boots.

 

More times than not the boot is the actual problem. Most of the time the dealer puts in a new coil because they dont want to take them out twice plus parts are more expensive, you can buy the boots for about four dollars a piece.

 

So if the boots look to be in good shape should I use di-electric grease when I put them back in?

Also, at 60K, what is the possibility of a bad spark plug?

Thanks,

MN

 

Well it will be hard to tell if the boot has tiny small pin holes but yes do use di-electric grease when going back on. OEM plugs are designed to go 100K+ but there is a chance. Why don't you check the plug while you have the coil packs off.

 

Changing the plugs will probably solve the problem I believe bosch is the oem plug try autolite platinum.

 

Checking/changing the plugs was my next step. Since this is a 2001 4.6, I didn't want to take any chances on getting this wrong if I didn't have to.

I have this one on lease and I'm one month away from the end.

I took the easy way out and changed the coil packs out with the ones I previously pulled. I put new boots on them first and now the truck runs like new.

One thing that I had trouble with was the fuel rail on the port side. The rail has a sensor on it directly over the top of the coil pack bolt for #7. I had to loosen the fuel rail to get a 1/4" ratchet underneath it. Once I figured this out it was no problem.

When I pulled #7 I noticed what looked like a very fine _SAND_ mixed with grease in the top inside and around the hole. There was some on the boot as well. I noticed some charring on the outside of the boot that indicated arcing. The sand was extremely fine and looked to be concentrated around where the boot seals to the head. I could see down into the recess and there was no visible sign of any more than what had leaked in around the top but shot it with air and vacuumed it out anyway.

I live in North Texas and I can’t see where this element came from. This stuff definitely did not blow in and magically accumulate around the boot seal.

Thanks,

MN

 

Glad to see you got everything working!

 

Is the cylinder order the same for the 5.4 ?

 

yes

 

That cylinder numbering is the same for every V8 motor ever created (as far as I know). It's the firing order that's different.

 

That's funny

 

Where were you 7 years ago when that was posted, Brew?