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F Series Forum covers questions and discussions regarding Ford F-150, Ford F-250, Ford F-350, Ford F-450, Ford F-550, Ford F-650, and Ford F-750.
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  #1  
Old 01-22-2016, 10:40 AM
wseeloff wseeloff is offline
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Miss firing
I have a 1999 F250SD with a 5.4 liter engine. It idles fine but has a miss when under load. What should I be looking at? It has newer plugs and wires.
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Old 01-22-2016, 01:55 PM
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65comet 65comet is offline
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Re: Miss firing
My guess is a vacuum leak as the first thing to look for if no codes and new plugs/wires.
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Old 01-22-2016, 03:17 PM
mechhound mechhound is offline
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Re: Miss firing
You say plugs and wires. Doesn't that engine have COPs. Coil On Plugs?

From what I read a bad COP will cause your condition. There are 8 Coil On plugs, one on each spark plug.
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Old 01-27-2016, 09:22 AM
rhandwor rhandwor is offline
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Re: Miss firing
A bad wire to an injector will also cause a misfire.
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