Miss firing

wseeloff

01-22-2016, 10:40 AM

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.

65comet

01-22-2016, 01:55 PM

My guess is a vacuum leak as the first thing to look for if no codes and new plugs/wires.

mechhound

01-22-2016, 03:17 PM

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.

rhandwor

01-27-2016, 09:22 AM

A bad wire to an injector will also cause a misfire.

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Miss firing