V10 missing under load
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Freshman User
Joined: Dec 2009
Posts: 45
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From: Girard PA
V10 missing under load
While driving to work doing about 50 mph going up a slight incline, the motor got sluggish pulling up the hill. Pulled over and could feel it at stop with the brake on. Put in park and could not tell really at all. Put it back in drive and really felt it around 40-45 mph. The truck is a 2000 F250 CC 4X4. She's got 75,000 on her with probably the original plugs and coils.
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
Go ahead and change the plugs and rubber boots since you think they're still the original. You need to have it done anyways. That may fix your misfire. If not, then you'll need to find out which cylinder/coil.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
When left alone for long periods of time, these Ford modulars like to suck dirt and moisture down into the spark plug holes. I'm willing to bet you have a pile of crud in at least one of the holes 
Tuned
Joined: Jan 2011
Posts: 365
Likes: 1
From: Massanutten,VA
I bought my X V10 about 175 miles from my home. On the way back when I was going through the mountains, I noticed that when the engine was under a load, I was getting a misfire, stumbling situation. Was fine on the levels. Was told in the Excursion forum to check the COP boots, sure enough they were not in the best of shape and not one drop of dielectric grease on any of the boots. New boots and a dose of dielectric grease problem gone
Senior User
Joined: Feb 2011
Posts: 421
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From: FT. Rucker AL
I bought my X V10 about 175 miles from my home. On the way back when I was going through the mountains, I noticed that when the engine was under a load, I was getting a misfire, stumbling situation. Was fine on the levels. Was told in the Excursion forum to check the COP boots, sure enough they were not in the best of shape and not one drop of dielectric grease on any of the boots. New boots and a dose of dielectric grease problem gone
Elder User
Joined: Feb 2006
Posts: 545
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From: FL
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New User
Joined: Jan 2011
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I'm having a similar situation, but im not so sure mine is a misfire. At around 40-45 mph and at 13-1500 rpm (and only when I'm trying to accelerate, like after someone pulled out in front of me) the whole truck will stutter. It's almost like it's trying to shift but can't, or like it shifts and immediately decides it shouldn't have and shifts back. If I give it more gas the rpms go up, it down shifts and gets me up to speed, no problem. Any ideas? 99 SD v10
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Senior User
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I'm having a similar situation, but im not so sure mine is a misfire. At around 40-45 mph and at 13-1500 rpm (and only when I'm trying to accelerate, like after someone pulled out in front of me) the whole truck will stutter. It's almost like it's trying to shift but can't, or like it shifts and immediately decides it shouldn't have and shifts back. If I give it more gas the rpms go up, it down shifts and gets me up to speed, no problem. Any ideas? 99 SD v10
The only way it got fixed was all spark plugs and brand new (Accel in my case) coils. Also did fuel filter, the gas coming from it was dark brown!
Cole
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