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misfire on an 02 5.4 sd

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Old 05-15-2013, 05:56 PM
prestroker93 prestroker93 is offline
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misfire on an 02 5.4 sd

I have a 2002 f250 sd it misfires when it warms up at low rpm but it doesn't throw any codes does anyone have any ideas
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Old 05-19-2013, 11:15 PM
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I just had a misfire with my 01 f250 5.4 the issue was #6 coil replaced myself try unplugging your coils one by one if it idles down its good but if you don't hear a change then its bad
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Old 05-20-2013, 08:55 AM
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If you connect a good or decent code reader you'll maybe find a pending misfire code. If that's not an option the process of disconnecting them one at a time works too.

FWIW I installed a full set of Granatelli's COP's that hate the cold---anything below 38* F over night and I'll get one or more misfire codes, the attendant rough idle too. Once the engine is up to operating temp shutting it off for just a few seconds then right back up and rough idle is gone, CEL remains unless I cancel it--which I don't do until spring or summer.

Hope this helps.
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Old 05-25-2013, 03:18 AM
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if you smell any antifreeze with your misfire...check the spark plug hole of the COP that you replace. If you see antifreeze in the plug hole you have another problem.

-your intake manifold like mine is leaking from the coolant crossover tube where the thermostat bolts into.
-or your heater hoses could be leaking.

I had coolant leaking in #6 and #7 plug holes. I have a new intake manifold now, I hope you don't have this problem.
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