hello all
I'm hoping that maybe someone can chime in.
my brother 2001 f250 v10 with 157k is in desperate need of some work so I offered to help him out with it.
first off its needs the exhaust studs done, but I have been soaking them for about a week in pb blaster and have a full rollaway if that doesnt work.
but the thing that i am having trouble with is it seems to have a very pronounced misfire so I hooked it up to my scan tool but got no codes.
i was hoping that I could at least get a cylinder # but no luck.
its just a moderately cheap actron obdII and I was looking for an excuse to get what type do you guys recomend for this truck. and any clues on how to narrow down my miss.
thanks in advance

 

It can be difficult to locate the misfire. Without the proper scope it can be difficult! My advise is take it to a shop or dealer and have them identify the problem then you can take it home and perform the repair. I spent several days looking for a miss on my V10...I gave up and had the dealer ID the problem. It ended up being a bad plug, I had just changed plugs 4,000 miles earlier and never would have thought it was the problem. Good luck.

 

Some people don't recomend this but the way I found my miss was simply pull the wire off the coils 1 at a time (pull off and put back on) and listen to the engine closely intill the one you pull does not change the sound of the engine and thats the cylinder and it will be the boot, coil pack or the spark plug. Mine was the boot look for any little white marks on the boot where the spark is jumping through to the head. This will work if you can hear the miss at idle.

 

In addition, once you locate the bad cylinder, you can swap the coil with another cylinder coil and see if the miss follows that coil. That way you know it's the coil. If not, then it's either your boot, plug, or coil connector.

 

I would replace all the plugs and the COP boots first. Sounds like the truck was probably neglected and the plugs probably have more than 50k miles on them. Your wasting your time and money replacing COPs if the plugs and/or boots are bad. Motorcraft SP479 is my preferred plug but the Autolite AP103 also works well.