COP going bad, wont set a code.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
It feels like one cylinder has a misfire.
You can feel it the most with a load and low revs, but you can feel it from Idle through the limiter.
It is worse when it is wet and damp like it has been the last few days.
On a dry warm day I might only feel a few misses all day.
Feels down a slight amount on power well doing it, but fine the rest of the time.
It feels just the same as the other coils that have gone bad.
If it just wont set a code I might just replace all 6 originals, but I hate to spend the money when 5 of them still have life left.
You can feel it the most with a load and low revs, but you can feel it from Idle through the limiter.
It is worse when it is wet and damp like it has been the last few days.
On a dry warm day I might only feel a few misses all day.
Feels down a slight amount on power well doing it, but fine the rest of the time.
It feels just the same as the other coils that have gone bad.
If it just wont set a code I might just replace all 6 originals, but I hate to spend the money when 5 of them still have life left.
Junior User
Joined: Sep 2008
Posts: 79
Likes: 1
I had a similar situation with my 03 V10. I ended up buying the 10 pack of coils off eBay for $120 shipped to my door - figured lifetime warranty, what the heck. The full coil switch fixed the problem and the truck has been running smooth as ever for the last 8000 miles with the cheapo coils...
Logistics Pro
Joined: Aug 2007
Posts: 3,974
Likes: 15
From: Millersburg, OH
Might want to try this seller on Ebay. He has 8 Motorcraft coils for $195 plus shipping. Even with shipping it's less then $27 a coil.
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Junior User
Joined: Sep 2008
Posts: 79
Likes: 1
If you have questions about the sellers warranty procedure, just ask them before bidding/purchasing.
Junior User
Joined: Sep 2008
Posts: 79
Likes: 1
I believe these were what I purchased...
10 IGNITION COIL ON PLUG 99-03 FORD F350 F-350 V10:eBay Motors (item 350217186946 end time Dec-20-09 08:45:17 PST)
10 IGNITION COIL ON PLUG 99-03 FORD F350 F-350 V10:eBay Motors (item 350217186946 end time Dec-20-09 08:45:17 PST)
More Turbo
Joined: Feb 2004
Posts: 704
Likes: 40
I have had a boot failure that felt just like a bad coil but did not generate any fault codes since, technically, there wasn't a misfire. The spark arced to the cylinder head instead of firing the spark plug. If you've never replaced the boots, you might want to try a new set first before spending money on coils.
Lou Manglass
Lou Manglass
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Its not a coil, I am now having slight surging at mid RPM and Moderate to heavy throttle. Still only does it when its cold and damp.
I need to start checking vacuum lines. I will let y'all know what I find.
I need to start checking vacuum lines. I will let y'all know what I find.
Cross-Country
Joined: Apr 2007
Posts: 90
Likes: 2
I had the same issue, no codes with a regular scanner, and I finally had a Ford Dealer hook it up and with the IDS/VCM and found that Cylinder 1 was intermittent misfiring.
Found that the injector wiring plug was bad.
7 bucks for the pigtail and it runs great again.
Found that the injector wiring plug was bad.
7 bucks for the pigtail and it runs great again.