F150 Bad Miss Fire - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 01-26-2009, 12:50 PM Thread Starter
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F150 Bad Miss Fire

Hey all, I have a 98 F150 5.4 that has a really bad miss fire that makes driving miserable. The check engine lights flashed on the dash but never stayed on. The local shop checked it but there was no code. they said they would have to replace all eight ignition coils?!! dont know if i understood them correctly but they claim them to be roughly $150 a piece!!! I hope someone can help me out to with this problem. Thank You
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post #2 of 7 Old 01-26-2009, 12:57 PM
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That sounds like a shotgun approach to me. I haven't had to trouble shoot a miss on a mod motor yet, but have you tried narrowing it down to the cylinder or cylinders that are missing? I've done it on older engines by pulling the plug wire off and starting it up till I found the one that didn't make it miss worse. You should be able to do the same by pulling the coil wires off on a 5.4?




2006 Ford F250 CC Lariat, SB FX4, 6.0L PSD, 5R110
2006 Mercury Mountaineer Premium 4.6L 3V AWD
1989 Ford Mustang LX Hatch. 5.0 (on a stand), AOD (T5 swap in the future).



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post #3 of 7 Old 01-26-2009, 12:59 PM
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Sorry for the double, but if you have an infrared thermometer available you should be able to find it to by pointing at the exhaust manifolds while the engine is running and seeing if one or more cylinders is cooler then the rest.



2006 Ford F250 CC Lariat, SB FX4, 6.0L PSD, 5R110
2006 Mercury Mountaineer Premium 4.6L 3V AWD
1989 Ford Mustang LX Hatch. 5.0 (on a stand), AOD (T5 swap in the future).



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post #4 of 7 Old 01-26-2009, 01:00 PM
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Hey there man, I used to own a 2000 F150 before i got my PSD... I wouldnt call it a miss fire but the truck would kinda studder an surge when driving, I was told to replace my cam positioning senser (CPS) an then the motor ran like a top again. That Truck was a 4.6L with a 5 speed great little pick up. But i have heard that the same thing will happen to the 5.4...... Anyways good luck ask a mechanic about that senser!!!!
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post #5 of 7 Old 01-26-2009, 06:22 PM Thread Starter
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ok thanks for the help guys unfortunatly im not extremely mechanically intelligent but i will see what the mechanic say to your suggestions. Thank You again for your help
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post #6 of 7 Old 01-26-2009, 06:25 PM
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My buddies 4.6L runs like chit. When your CEL flashes your truck is in limp mode... your cats could be clogged.

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| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune | SOLD

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| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
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post #7 of 7 Old 01-26-2009, 07:23 PM
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Yeah i took my cats out just like everything that i have ever owned!!!! Thoughs 4.6L's are some or the best EFI motors that ford has built. I thrashed that poor little truck in the oilfield, Never let me down!!!!!! Love my 7.3 but have been left stranded from it more then the gas pot, sorry PSD!!!!!
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