2000 V-10 missing at 40-45 mph
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Lead Driver
Joined: Mar 2004
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From: Northern Indiana
2000 V-10 missing at 40-45 mph
Have a 2000 F-250 V-10 4x4 with 335,000 miles on the clock. Has started hesitating at 40-45. You can't really notice it at idle. Drove it around at lower speeds and just a miss here and there. Take it up to 40-45 and it's quite bad. Hasn't thrown any codes. Hooked it up to the scanner to get no additional info. My gut says coil packs but am kinda confused that I haven't gotten a misfire code yet. Any other ideas to check?
Posting Guru
Joined: Jun 2009
Posts: 1,908
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From: Fort Smith, Arkansas
Most likely is spark plugs. While you are in there changing them inspect the coil boots. With that many miles, if you don't remember when the boots were changed last it is probably best to plan on changing all of the boots.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
Not sure that it is the spark plugs for sure, but excessive wear from leaving them in for too many miles can cause them to fall apart.
The rubber coil boots can get misshapen over time. This can cause the end that fits over the spark plug to relax and widen out enough that it can leak from either dirt or moisture and can cause the coil's discharge energy to short circuit to the edge of the plug well instead of through the center of the plug like it is supposed to. Or the rubber can develop cracks that can also make it leak.
Whatever the cause of a misfire, the spark plug on the misfiring cylinder should be changed for a new one.
The rubber coil boots can get misshapen over time. This can cause the end that fits over the spark plug to relax and widen out enough that it can leak from either dirt or moisture and can cause the coil's discharge energy to short circuit to the edge of the plug well instead of through the center of the plug like it is supposed to. Or the rubber can develop cracks that can also make it leak.
Whatever the cause of a misfire, the spark plug on the misfiring cylinder should be changed for a new one.
Lead Driver
Joined: Jan 2002
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From: Itinerant
I had something similar on my '99' 5.4 which had fresh plugs, cleaned the MAF sensor, filters and after taking the throttle body off and cleaning it which was pretty nasty in side the problem went away. Just throwing it out there.
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