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2000 V10 Missing When Lugging

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Old Mar 20, 2011 | 03:57 PM
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2000 V10 Missing When Lugging

My 00 V10 has a missing issue when the truck is lugging at low rpms. I have replaced all of the spark plugs, they were in fair shape. Have have no check light coming on. Anyone have an idea?

Thanks
 
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Old Mar 20, 2011 | 05:33 PM
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Was this already happening prior to the spark plug change? What kind of plugs did you use? Boots changed also?
 
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Old Mar 21, 2011 | 05:53 AM
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Plugs were replaced to try and fix the issue. I used the direct replacement motorcraft plugs. The missing is still there at higher rpm's I just notice it more when its at lower rpm's. Did not replace any of the boots they all looked fine.
 
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Old Mar 21, 2011 | 07:23 AM
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Either get the misfire counters read so you know which cylinder, or buy one new COP and play round-robin.

Sounds like you have a bad COP.
 
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Old Mar 21, 2011 | 09:01 AM
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Talked to a local repair shop and they said they would hook it up to tell me which one is miss firing. Should you always replace the plug boots when replacing the plugs?
 
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Old Mar 21, 2011 | 09:38 AM
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Originally Posted by joeskeeter
Talked to a local repair shop and they said they would hook it up to tell me which one is miss firing. Should you always replace the plug boots when replacing the plugs?
Absolutely. Highly recommended that you do.
 
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Old Mar 21, 2011 | 09:43 AM
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my vote is a coil....
 
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Old Mar 21, 2011 | 11:40 AM
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Took it to the shop they said #7 was bad. Off to the parts store to get one and change it out. At least its in the front and its not number 5. Any brand better than the other on these?
 
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Old Mar 21, 2011 | 01:54 PM
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Stick with Motorcraft COPs.
 
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Old Mar 22, 2011 | 05:04 PM
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Replaced the coil that the code said was bad and still have the miss. I had the codes reset. How much time or driving does it take for the codes to show up again?

Thanks
 
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Old Mar 22, 2011 | 05:33 PM
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Try inspecting that plug as well to see if it may be defective or not gapped properly.
 
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Old Mar 22, 2011 | 06:01 PM
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I inspected all of the plugs closely before I put them in and they all were the same gap.
 
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Old Mar 22, 2011 | 06:31 PM
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Since the boots were not replaced, I wonder if maybe you may have some corrosion on the spring and it's not getting a good contact to the plug?
 
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Old Mar 25, 2011 | 06:15 PM
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Hope you have better luck than I did.When my cop went out mine wouldn't reset. Kept showing missfire finally found out it took the computer out with out.A guy thats works on them said was a common problem and the computers are on national back order. So I sit and wait just hope if another cop goes bad it leaves the computer alone.
 
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Old Mar 26, 2011 | 07:23 AM
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Originally Posted by joeskeeter
Replaced the coil that the code said was bad and still have the miss. I had the codes reset. How much time or driving does it take for the codes to show up again?

Thanks
Another thing to check is the individual harness connectors for the COP's. I had a similar miss on my 5.4 V8 showing up n Cyl #7 even though a known good COP and new plug were installed. Seems somewhere along the line the locking tabs on that connector broke and wasn't making good contact.

Start the engine and push in on each connector to see if that affects the idle. If so mark the offender and head off to NAPA picking up EC259 for about $19 each.

Definitely change the boots AND use dielectric grease inside them---just good practice!
 
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