99 Expedition 4.6 Misfire

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Thewdawg - 30 Nov 2006 15:51 GMT

I have a 304 Code... w/ intermittent misfire. I have replaced plug &
wire. Pulled injector and blew it out and replaced and ran a drop test
on 1-4, which checked O.K. Afterwards, drove for about 30 mi w/ no
misfire and running smooth. Next morning cranked up w/ miss again.
Wondering if it could be trash in fuel rail or what is the likelihood
of coil pack going bad? Ideas?

Thewdawg

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F.H. - 30 Nov 2006 19:25 GMT

> I have a 304 Code... w/ intermittent misfire. I have replaced plug &
> wire. Pulled injector and blew it out and replaced and ran a drop test
[quoted text clipped - 4 lines]
>
> Thewdawg

My 4.6 is notorious for very small water leaks that manage to leak into
the spark plug chamber. I would check all the plug wires for moisture.

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sleepdog@optonline.net - 30 Nov 2006 19:50 GMT

> I have a 304 Code... w/ intermittent misfire. I have replaced plug &
> wire. Pulled injector and blew it out and replaced and ran a drop test
[quoted text clipped - 4 lines]
>
> Thewdawg

Coil on plug? If so swap the #4 COP and boot out to an adacent
cylinder and see if the code follows it. Look for carbon tracks on the
boot.

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