Lincoln Navigator COP
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Lincoln Navigator COP
Ok, I bought a high mileage Navigator to pull my work trailer. Since a month ago, I have had three coils and plugs replaced (#5, 6, and 7) at the dealer. Two were back to back, and number seven started acting up a week ago, I had it replaced today, and now it's not running right again. I find it hard to believe they are simply going out one at a time, back to back. The dealer is charging $260 every time I have one replaced, and at this point, I can't afford to fix it anymore. Is there something else going on, and the dealer isn't looking for it perhaps? Any help is appreciated.
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Joined: May 2010
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What year and how many miles? I suspect a couple of possible things. You had a misfire on a cylinder. They pulled the plug and it looked bad (probably original, since they're a pain to change). They threw in a coil for good measure. Problem solved on that cylinder. Rinse and repeat 2 more times. Every other spark plug is probably original and worn out, and either causing the misfire and/or wearing out the coil jumping the large gap in the old plugs.
For what you paid, you could have bought OEM plugs, all 8 coils (rockauto, ebay) AND paid an independent shop to put it all in and solve the problems. I'm betting with all 8 plugs and coils you'll be fine for a long time. I also bet the coils haven't been necessarily bad each time, either. Most of the time it's just the boot. However, if it were me and I was already there, I'd buy replacement coils for the remaining 5 and just have them all new, and save what you have for spares.
The above is just a guess of course without seeing the vehicle.
For what you paid, you could have bought OEM plugs, all 8 coils (rockauto, ebay) AND paid an independent shop to put it all in and solve the problems. I'm betting with all 8 plugs and coils you'll be fine for a long time. I also bet the coils haven't been necessarily bad each time, either. Most of the time it's just the boot. However, if it were me and I was already there, I'd buy replacement coils for the remaining 5 and just have them all new, and save what you have for spares.
The above is just a guess of course without seeing the vehicle.
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What year and how many miles? I suspect a couple of possible things. You had a misfire on a cylinder. They pulled the plug and it looked bad (probably original, since they're a pain to change). They threw in a coil for good measure. Problem solved on that cylinder. Rinse and repeat 2 more times. Every other spark plug is probably original and worn out, and either causing the misfire and/or wearing out the coil jumping the large gap in the old plugs.
For what you paid, you could have bought OEM plugs, all 8 coils (rockauto, ebay) AND paid an independent shop to put it all in and solve the problems. I'm betting with all 8 plugs and coils you'll be fine for a long time. I also bet the coils haven't been necessarily bad each time, either. Most of the time it's just the boot. However, if it were me and I was already there, I'd buy replacement coils for the remaining 5 and just have them all new, and save what you have for spares.
The above is just a guess of course without seeing the vehicle.
For what you paid, you could have bought OEM plugs, all 8 coils (rockauto, ebay) AND paid an independent shop to put it all in and solve the problems. I'm betting with all 8 plugs and coils you'll be fine for a long time. I also bet the coils haven't been necessarily bad each time, either. Most of the time it's just the boot. However, if it were me and I was already there, I'd buy replacement coils for the remaining 5 and just have them all new, and save what you have for spares.
The above is just a guess of course without seeing the vehicle.
Thanks for the response Brandon. I have an 04 model, with 185,000 miles on it. You are correct, they have been original plugs, they gave me the old ones when they pulled them. I am shocked that once they started going, it seems they are all going one at a time.
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Joined: Sep 2010
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From: Southern Cal
Were they OEM plugs or the original plugs? If original and 185k, I'd expect a misfire or two.
To Brandon's point, if they pull out a COP, chances are the boot was cracked and if not, it is now, after removal.
Once they got under the hood, I could understand how it might not just be coincidental.
To Brandon's point, if they pull out a COP, chances are the boot was cracked and if not, it is now, after removal.
Once they got under the hood, I could understand how it might not just be coincidental.
Fleet Owner
Joined: Apr 2008
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Why are you shocked? They all have the same mileage on them, so it stand to reason they would all reach their end of life cycle about the same time.
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