'98 - 5.4 EB Missing under light load
Senior User
Joined: Aug 2001
Posts: 383
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From: MA
Finding the misfire was a good experience for me. I could not have done it without help from this forum. I'm ready to replace the rest of the spark plugs now and I will tackle those as time permits, even if it is one at a time. Great information about the COPS. Thanks
Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
I have had several experiences where the boot was the culprit---not the COP. I can't even imagine how much money stealerships have made off COP replacement when it was really the boot that deteriorated because of the heat and caused the secondary voltage to ground.
When you pull the COP, look at the boot carefully. If the rubber feels softer than other boots or certainly if you find a crack or split, spend the $3 and replace the boot. A lot better than the $40 for the COP. Also, when checking the resistance of the COP, I think anything in the range of 20% variation in what the Haynes specs tell you is probably OK. Higher than that, its probably failing. Not foolproof, but a pretty good rule of thumb.
When you pull the COP, look at the boot carefully. If the rubber feels softer than other boots or certainly if you find a crack or split, spend the $3 and replace the boot. A lot better than the $40 for the COP. Also, when checking the resistance of the COP, I think anything in the range of 20% variation in what the Haynes specs tell you is probably OK. Higher than that, its probably failing. Not foolproof, but a pretty good rule of thumb.
Senior User
Joined: Aug 2001
Posts: 383
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From: MA
Where are all of you finding the boots for around $3 and coilpacks for $40? Here in eastern MA, NAPA stores are charging $3.99-$4.39 for the NAPA brand boots and $9+ for the Beldens. Advance Auto is $19+ for a package of two boots and $50+ for the coilpacks. Talk about highway robbery.
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Freshman User
Joined: Feb 2006
Posts: 38
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At least you just have a short drive to Tax Free NH ;-)
The prices you are seeing are comparable to what I found in the parts stores here in MI.
I paid $59 for OEM and $47 for A.N.other when store was out of OEM stock.
Dealer quoted $17 for boots only...
The prices you are seeing are comparable to what I found in the parts stores here in MI.
I paid $59 for OEM and $47 for A.N.other when store was out of OEM stock.
Dealer quoted $17 for boots only...
Senior User
Joined: Aug 2001
Posts: 383
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From: MA
lynnr,
I just completed plug replacement for all 8 cylinders. It took some time (about 10 hours in total), but I have a list of a few tools that I will need to pick up if I have to do this job again. If I ever have to replace the plugs again, I could easily do it in half the time next time. The coil packs are really not that difficult to get out and once you figure out how to access the plugs, the job is not that difficult. I was actually surprised that I was able to torque all plugs with a 3/8 drive torque wrench. Out of curiosity, I measured the resistance of all the coil packs. On the primary side they all measured.70 ohms and on the secondary side they all measured 5100-5200 ohms. After some of the feedback regarding the coilpacks, I not sure if the resistances provide any information. I did not have a chance to test drive after completion of the work, but I am somewhat irritated now that my mechanic charged me almost $300 for diagnosing and replacing the #4 coilpack last spring without replacing the plug. While he replaced that coilpack, he should have replaced the sparkplug at the same time.
I just completed plug replacement for all 8 cylinders. It took some time (about 10 hours in total), but I have a list of a few tools that I will need to pick up if I have to do this job again. If I ever have to replace the plugs again, I could easily do it in half the time next time. The coil packs are really not that difficult to get out and once you figure out how to access the plugs, the job is not that difficult. I was actually surprised that I was able to torque all plugs with a 3/8 drive torque wrench. Out of curiosity, I measured the resistance of all the coil packs. On the primary side they all measured.70 ohms and on the secondary side they all measured 5100-5200 ohms. After some of the feedback regarding the coilpacks, I not sure if the resistances provide any information. I did not have a chance to test drive after completion of the work, but I am somewhat irritated now that my mechanic charged me almost $300 for diagnosing and replacing the #4 coilpack last spring without replacing the plug. While he replaced that coilpack, he should have replaced the sparkplug at the same time.
Junior User
Joined: Nov 2003
Posts: 60
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From: Tyler, TX
I am trying to diagnose an engine miss so I changed the plugs and checked resistence on the COPs. The primaries were .8 while the secondaries where 8K. FWIW, they were all the same. Are these numbers bad and could they be causing the 11 MPG city I'm getting?
Rob
Rob
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Freshman User
Joined: Feb 2006
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Sorry don't have anything more to offer, except to reiterate what is back there in the thread...mine and 98expeditionXLTs coils tested out about the same values. And it seems to have turned out those values tested that way, don't mean a whole lot.
If your symptoms match those described, get one new coil and rotate it. You'll get real good at removing and replacing coils ;-)
Optionally swap plugs if they're near due.
If you're prepared to repeat the whole process, maybe start by replacing and rotating just a boot. Good luck!
If your symptoms match those described, get one new coil and rotate it. You'll get real good at removing and replacing coils ;-)
Optionally swap plugs if they're near due.
If you're prepared to repeat the whole process, maybe start by replacing and rotating just a boot. Good luck!
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ItsAndy
1997 - 2006 Expedition & Navigator
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Mar 18, 2016 04:26 PM
2001, 2006, 54, 92, 98, acceleration, bad, expedition, expedittion, expidition, f150, ford, load, lt, miss, missing
