Guys, been chasing a stumble on my 2000 v-10. i have swapped all the original cop's for BWD packs from adv.auto....have had a stumble for a couple of weeks now. (see earlier posts for details) was beginning to think it was transmission, took it to ford this morning to have it scanned, they told me it was # 6 and # 9 packs had a slight miss. had swapped out #9 couple of weeks ago when i did tune up. they were warrantied from advance, so i swapped them out. still has stumble/slight shudder.....i have a friend who wholesales motor craft parts tell me that ford trucks need the oem cops when you replace them. any truth to this or does it matter? hate to drop 400 bucks for new cops, but if that is what i need to get truck in top shape...........thanks Britt

 

did you replace the boots?

 

Are the plugs fairly fresh? I wore a pair out in around 40,000 miles and it was running like that. BWD are what I use and they seem great.

 

plugs less than two weeks old,new boots too

 

Have you rechecked the inside if every boot to make sure its clean and making good contact, then made sure the electrical plugs are all clean and tight?

I had a miss after changing mine and thoes two things on sevral diffrent cylinders were the reason.

 

gotta let it cool down, will double check and get back. thanks

 

pulled all ten packs....boots were new or in great shape. other than perhaps a little to much di-electric grease all seemed ok. runs a little better,however not all it could be. thanks

 

Stay away from the "high performance" branded coils; MSD, ACCELL..

I've found the most reliable coils to be either STANDARD or BWD.

 

Since it's multiple cylinders, it could be a mixture problem. Remember, dielectric grease is an INSULATOR - so if it got onto the spring or plug tip, it could be part of the problem.

 

update....swapped all 10 packs for oem. noticed an interesting tidbit, on some of the BWD packs, the boots were a little shorter than the oem ones....HMMMMMMM...wonder if that could have contributed to the stumble? only drove it a couple miles tonite, so will know more in next couple of days...

 

Last weekend I retorqued plugs and changed plug boots with Autolite from Advance for 50 bucks, look just like OEM.

 

they jook alike....did you do a side by side length of boot comparison? Not saying they arent the right ones....its hard to tell in the cylinder hole how far the boot goes down on the plug. i was able to swap my bwd coil packs for oem motorcraft for less than 15.00 total for all ten C O P's

 

Side by side same length.