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Mar 16, 2022 | 09:19 PM

#16

xd2200

Mountain Pass

Joined: Feb 2004

Posts: 152

Likes: 5

YES - OEM Motorcraft. Also, be careful where you buy them - much counterfeiting. I try to increase odds of getting the real ones by buying from a dealer

Apr 17, 2022 | 05:01 PM

#17

klausd

Thread Starter

Cross-Country

Joined: Jan 2021

Posts: 58

Likes: 1

From: cheney

Would it be better to replace the entire coil plug or can I do just the boot and spring?

Apr 17, 2022 | 07:20 PM

#18

WE3ZS

Moderator

Joined: Jul 2010

Posts: 12,050

Likes: 1,549

From: Media PA

Quote:

Originally Posted by klausd

Would it be better to replace the entire coil plug or can I do just the boot and spring?

Its not a coil plug, you have plugs threaded into the heads, and coils on plugs (COPs) with rubber boots and contact spring in between. There is no reason to change COPs unless you have proven one or more to be bad. These coils tend to very long lives before failure. Unless you have a miss caused by a bad coil just replacing the plugs, boots and springs should make it run like new.

Apr 17, 2022 | 08:07 PM

#19

klausd

Thread Starter

Cross-Country

Joined: Jan 2021

Posts: 58

Likes: 1

From: cheney

my obd sensor says I have multiple misses, i changed my plugs to OEM Motorcraft properly gapped and it still shows the code.

Apr 17, 2022 | 08:34 PM

#20

WE3ZS

Moderator

Joined: Jul 2010

Posts: 12,050

Likes: 1,549

From: Media PA

If your scanner isn’t showing which cylinder has a miss you can unplug each COP one at a time at idle and see which one doesn’t affect the idle to find a dead COP. A good COP getting unplugged will obviously negatively affect the idle.

Apr 17, 2022 | 08:34 PM

#21

6point0

Tuned

Joined: Apr 2010

Posts: 479

Likes: 34

Does the truck run better?

did you clear the codes, and see if they come back?

Apr 17, 2022 | 08:59 PM

#22

klausd

Thread Starter

Cross-Country

Joined: Jan 2021

Posts: 58

Likes: 1

From: cheney

Truck runs like dog ****, rough idle and no power and still showing multiple miss fires

Apr 17, 2022 | 10:24 PM

#23

STOFFERJ

More Turbo

Joined: Mar 2009

Posts: 532

Likes: 92

Quote:

Originally Posted by klausd

1999 f250 super duty 6.8 v10 gas

so a 2 valve NPI v-10

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Apr 17, 2022 | 10:26 PM

#24

STOFFERJ

More Turbo

Joined: Mar 2009

Posts: 532

Likes: 92

Quote:

Originally Posted by klausd

is it true what they say about the plugs braking off when trying to replace them?

no, just no

Quote:

Originally Posted by klausd

A brand name I saw on rock auto

just stop, use the above mentioned Motorcrafts BUT I suggest you swap the coil packs and possibly injectors as there’s a lot more to this than you’re telling us

Apr 18, 2022 | 06:58 AM

#25

WE3ZS

Moderator

Joined: Jul 2010

Posts: 12,050

Likes: 1,549

From: Media PA

Quote:

Originally Posted by klausd

Truck runs like dog ****, rough idle and no power and still showing multiple miss fires

The truck and wiring harness is 23 years old, verify that the electrical plugs going to the COPs are still good and actually click onto the coils when plugged in. Sometimes the tab that allows for the click breaks and that doesn’t keep the plug fully seated which can cause a miss due to poor electrical connections.

Apr 18, 2022 | 10:14 AM

#26

redford

FTE Leadership Emeritus

Joined: Sep 2000

Posts: 23,174

Likes: 1,678

From: Stephensville WI

There are many things that will cause multiple misfires, even some that are not ignition related.

Can you tell us what specific error codes are being issued?