#3 coil pack code
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Joined: Oct 2005
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From: Cincinnati
#3 coil pack code
Hello I've been using the great info off of this site for some time now, it helped me through my iac problem a couple months ago, and now i find myself preparing to tackle another common problem the coil pack issue. How hard is #3 to get to? This one doesn't seem to be a common one to go. code also came up saying random misfire, but the guy at autozone said that was prob because the #3 was screwing up the order. Anything else I should look for or be carefull not to do?
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If you get a minute check out the link here, it will help you to navigate around and understand this site.
https://www.ford-trucks.com/forums/s...88#post3272088
We are happy you have chosen the best source for Fords!
Enjoy FTE and The State Chapters are located at the bottom of the main forum page.
JOIN CLUB FTE -SUPPORT THE FORUMS!
See you on the boards.
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Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
toy8500
Assume you're getting a P0303 code set for misfire. On the 5.4, the #3 plug is third one back on the passenger side. Not too hard to get to (#4 and #8 are worst, especially #4).
Contrary to some experiences, you can remove the COP without removing the fuel rail. Just be patient and rotate the COP after lifting straight up off the plug to manuever around the fuel rail.
Test the resistance of the COP BEFORE you assume it's bad and throwing the code. The Haynes book gives test procedure, or you can just compare the resistance readings for the primary and secondary with another COP.
Often, I have found the culprit for a misfire to be a bad insulator boot rather than the COP. This boot fits between the bottom of the COP and the plug. Sometimes, the heat will cause the rubber to get weak, crack, and ground out the secondary, which tells the PCM a misfire has occurred. The boot sells for about $3, rather than $35 for the COP.
So, your procedure should be:
(1) remove and test the #3 COP.
(2) if the COP tests OK, check the boot.
(3) reassemble and clear the code (either by resetting with an OBD-II scanner or disconnecting the battery for 20 minutes or so)
(4) if the MIL doesn't illuminate again, then problem solved.
Assume you're getting a P0303 code set for misfire. On the 5.4, the #3 plug is third one back on the passenger side. Not too hard to get to (#4 and #8 are worst, especially #4).
Contrary to some experiences, you can remove the COP without removing the fuel rail. Just be patient and rotate the COP after lifting straight up off the plug to manuever around the fuel rail.
Test the resistance of the COP BEFORE you assume it's bad and throwing the code. The Haynes book gives test procedure, or you can just compare the resistance readings for the primary and secondary with another COP.
Often, I have found the culprit for a misfire to be a bad insulator boot rather than the COP. This boot fits between the bottom of the COP and the plug. Sometimes, the heat will cause the rubber to get weak, crack, and ground out the secondary, which tells the PCM a misfire has occurred. The boot sells for about $3, rather than $35 for the COP.
So, your procedure should be:
(1) remove and test the #3 COP.
(2) if the COP tests OK, check the boot.
(3) reassemble and clear the code (either by resetting with an OBD-II scanner or disconnecting the battery for 20 minutes or so)
(4) if the MIL doesn't illuminate again, then problem solved.
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