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Old 06-18-2017, 05:23 PM   #1
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V-10 Started Missing on 3 Cylinders

2000 80k miles gets ran regularly at least twice a month year round and suddenly this. I think it was 1 , 3 and 6 missing. Start with new plugs?

Thanks for any thoughts

Mike
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Old 06-18-2017, 05:48 PM   #2
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Have you ever changed the plugs before ?
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Old 06-18-2017, 05:55 PM   #3
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What are the odds of 3 at once going bad I would lean towards ignition like wires or cap maybe mouse under there

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Old 06-18-2017, 06:10 PM   #4
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I'm going to pull the engine cover tomorrow it was too hot today. My OBDII reader said 3 were missing so away we go. First engine issue but needs to be ready for a long trip in a couple of weeks. Usual weekends are to the farm and n\ back about 70 miles total
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Old 06-18-2017, 09:14 PM   #5
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You said your engine is a 2000 V-10. You don't have plug wires, cap or rotor. That uses the COP design (Coil Over Plug). It is intended to eliminate secondary ignition break down in those areas of cap rotor and wires.

With that many years and miles unless it's already been done it's probably time for new coils. Most just replace them all and keep a few of the surviving ones as back ups. Remember if you carry spares you'll never need them.

There are several places to get the coils a lot cheaper than from the dealer. Do some searches on this forum to locate the better deals. There are also several threads devoted to that topic.

As mentioned if the plugs have not been changed it's time for that as well. My guess is your misfires are on some defective coils.
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Old 06-18-2017, 09:24 PM   #6
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Is the 2000 one of those that only has three threads holding the plugs in and they strip out when removing the plugs or is it another year?
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Old 06-18-2017, 09:24 PM   #7
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I'd start with the coils.

Those are 100,000 mile plugs in an engine with aluminum heads and only 4 threads holding the plug in. At 17 years old you can also bet on some corrosion. There are in place thread replacement kits available. There are special precautions for changing those plugs. There are specific low torque limits. Either make sure you know what you are doing or pay somebody who has experience if you want to change the plugs. Be careful or it will be new heads. I'd put another 20,000 on the plugs and schedule shop time. YMMV.
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Old 06-18-2017, 09:48 PM   #8
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Caution with this plug change is in order and gather as much information as you can. There are many, many threads on the plug change as well. I can't keep the exact story straight in my head about which years and how to avoid problems when changing the plugs. Some say to warm up the engine and others say not to.

Many have changed these plugs with no issues. I don't really think it's as bad as has been reported. And they can be fixed without changing the heads. There are also several precautions to be taken to minimize the issues.
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Old 06-19-2017, 04:29 AM   #9
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If you decide to change plugs; Use the auto-lite nickle plated plugs (they're silver color, not black)

I used a very thin dab of anti seize on the threads. AND, the most important part, torque them to 160 inch lbs.

Don't rely on just snugging them up, and don't use a ""Ft-Lbs" wrench
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Old 06-19-2017, 06:42 AM   #10
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Waiter21,

I concur 100%. Some say don't use anti-seize and other do say to use it. My thoughts are simple. How can it hurt to use a dap?? And yes it just might hurt to not use it.
A 160 inch lb is about 13 ft/lbs and most 1/2" torque wrenches are not accurate at the lower ends.

As far as the exact plugs Waiter 21 is probably correct. You can always double check by going to at least two service managers at different Ford garage and just ask them. Most that I have met and talked to will know what's going on. If you are still a bit concerned make a few phone calls and add those results to your information.

Might add this!! We did have a mouse or something chew through some injector wires. It ran one well one week and the very next time we took it out it was not.
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Old 06-19-2017, 07:10 AM   #11
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If you use anti-seize use the type intended for aluminium assembly ,some anti-seize contains copper which is not compatible with aluminum .
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Old 06-19-2017, 07:23 AM   #12
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As a RV service manager for 15 years and a mechanic for 50 years, I will bet my house that you DO NOT have a coil or spark plug problem. The chance of three failures at one time is so astronomical, My computer can not figure that high. Check your wiring!
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Old 06-19-2017, 07:38 AM   #13
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Quote:
Originally Posted by ga traveler View Post
As a RV service manager for 15 years and a mechanic for 50 years, I will bet my house that you DO NOT have a coil or spark plug problem. The chance of three failures at one time is so astronomical, My computer can not figure that high. Check your wiring!
I agree, probably mice/rats chewing wires or bad connections from condensation.
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Old 06-19-2017, 09:24 AM   #14
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Originally Posted by mikell View Post
I think it was 1 , 3 and 6 missing. Start with new plugs?

Thanks for any thoughts

Mike
What codes are you getting from your scanner? Knowing which cylinders are misfiring is important. Also just to be different, check for liquid/rocks/gravel in the spark plug holes. I remember reading about a hole leaking into the spark plug.
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