July 27, 2004Heres the scenario...I had a coil pack replaced on my 01 5.4L about 3 months ago and now i'm getting the same misfiring problem again. Not thinking, i went ahead and disconnected/reconnected the battery. It got rid of the check engine light, but not the misfire. And apparently it got rid of the codes too (?). I rented a code reader last night and No Codes Found. So - here is my question. How are the Coil Packs tested? I'm trying to pinpoiont which cylinder is misfiring because if it's the one that Ford already replaced, it should be covered under warranty. If it's NOT the one Ford did, then I dont want to take it back to the dealership. I'd rather just replace the piece myself. I've tried unplugging each coil one at a time and the misfire seems to get equally worse with each one. In addition to "how are the coil packs tested", when one does go bad, is it usually an "all-or-nothing" thing, or can it be an intermittent sputter type of thing? Any comments on how to diagnose this would be greatly appreciated!
Forums : Engines-Gasoline 8-cyl : Coil Pack Question (167 Views)
July 27, 2004I was going to suggest disconnecting one at a time too.
Disconnect the new one first and youll have your answer whether its a warranty thing.
July 27, 2004yeah, did that and the engine did seem to shimmy a little more, so I guess that answers that question. maybe i have a bad plug problem now. I just wish i could pinpoint which cylinder it is. Does anyone know if that little OBDII reader that you can rent from OReilly's is the same that the dealership would use?
July 29, 2004MX,
It's basically the same type of reader on a smaller scale. I sell those Actron readers at Advance, and they are a hot little tool.
I recently had the same problem with my 02 4.6. It was the number 4 coil pack which took a nose dive. Basically all it is, is a coil sitting on top of a long coiled up spring used as a connection to the plug. But you have to remember one thing, that spring just sits on top of the plug and does not plug into it. Make sure of all your plug connections to the plugs are good and tight. Those coil packs are designed to either fire or not fire, so as far as testing goes, you can throw a test light in there with someone turning the key, and check for power. Simple.
If your still having a problem, then you might want to change the plugs. Personally if you do, i used the Bosch Plat.4's. They work just fine, or you go go with the 2's instead. I have installed many sets of these on customers trucks and have had 0 problems. Plus they are guarateed.
Let me know how you made out, maybe there is something else going on with it.
July 29, 2004thanks! well, the Service Engine Soon light came back on, so i rented that little code reader again and found Misfire on #5. thats one I hadn't looked at yet. I pulled the coil out and found some condensation beads around the rubber boot. So I dried it off and blew out the hole. driving around the block last night, problem was still there. but the S.E.S. light didnt come back on. this morning, on the way to work, drove just fine. so I dont know what is going on, i guess i'll just have to keep my fingers crossed at this point. i hope people save some money from these forums - I know i have. I pulled my paperwork from my last dealership replacement of coil ($13 and plug ($10) - plus the $240 or so labor. had i done my research, i probably could have done it myself. and just as an fyi, O'reilly's has the coils for $75. thanks again for everyone's help.
July 29, 2004$240 labor!!! Thats crazy, sounds like they are just looking up the listing in "the book" and not charging for actual time, that has to be at least 3 hours of work I would imagine.
July 29, 2004Ive had to replace #4 twice with no codes. Put a multimeter on it
July 30, 2004Hey Napa has the coil packs for 45.00, here in New York area, if your boot was wet your plug may as well be wet or fouled check it also. Shop that did work on my truck left my hood open over night guess what happened that night, Yep it rained and screwed up two of my coil packs.
July 30, 2004ugh! that sucks! i'm not even going to ask why they left your hood open!! btw...still no sputtering after drying off the boot and plug!
July 30, 2004I had a seep from my heater hose ruin no.4 of my coilpacks. I just replaced no 1 it just quit but my micro tuner traced the code. The plug looked fine a nice light brown color. I replaced it too just in case.
August 2, 2004If you had the coil pack replaced under warranty, and it's the exact same coilpack failing... you should call Ford Customer Service (ask 1-800 information for the number if you don't have it) and ask what the warranty is on the work performed (not the warranty on the vehicle, which may or may not be covered at this time).
Generally speaking there IS a warranty on warranty work.
August 4, 2004I wish I could pinpoint which coil is missing on my truck. It has been goin on for a while now. I've never gotten a CEL, And it is so intermittent that I would hate to take it to the stealership and find out nothing.