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Old 07-06-2009, 18:24   #1 (permalink)
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confused 2003 V6 XLT misfire

I can't figure this out, bear with me. We have an '03 XLT V6 2WD with 135k on the odometer. Recently I replaced the vacuum hoses (looked pretty dried out), spark plugs were replaced with Autolite double-platinums (though the old plugs could have just been regapped, I was in there so..)

This is a coil-on-plug setup.

The Escape will miss at idle (sometimes), miss under load (going up hill, for example)(sometimes). It will run fine when cool, or not, or run fine all day hot or cold, or not. Or it will do it when it's raining out, or not.

What's odd is that when the miss occurs at idle or under load, usually getting the revs up makes the problem go away (getting it to downshift, or if it's missing at idle simply pressing the throttle down and driving away).

In that scenario, once moving, there is no misfire and the Duratec pulls like a mule with it's tail on fire. When there is no miss, it idles and runs as smooth as can be.

So I have an intermittent miss, I'm down to swapping coils from one place to another, I broke down and bought a little OBD II reader. The last code was misfire on cylinder 4 at startup (which I understand is the cylinder towards the front of the car on the passenger side).

Anyone have other clues for me to follow? For testing, could I swap a coil in from my '00 Sable Duratec, are they the same?
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Old 07-06-2009, 20:37   #2 (permalink)
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Re: 2003 V6 XLT misfire

Are those the original coil packs? If so...

I'll take a stab at it and guess it's either the coil pack or plug wire.
Perhaps it's intermittent because of heat & vibration.

Edit: according to Wikipedia the Taurus/Sable/Escape used the same Duratec engine.
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Old 07-08-2009, 19:52   #3 (permalink)
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Re: 2003 V6 XLT misfire

Thanks, Hurk.

Coil on plug means each spark plug has it's own coil - no coil pack, no plug wires.

Car ran fine today.
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Old 07-09-2009, 07:28   #4 (permalink)
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Re: 2003 V6 XLT misfire

I guess I use the term coil pack kinda loosely. I knew the V6 had individual coils.
However, it didn't occur to me that there'd be no plug wires. doh.
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Old 07-11-2009, 10:46   #5 (permalink)
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Re: 2003 V6 XLT misfire

Bump: still looking for suggestions.

Can now add an observation, wife drove car to work yesterday same time as I was leaving and I heard knock from tailpipe - the marble-in-a-can sound.
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Old 07-19-2009, 08:43   #6 (permalink)
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Re: 2003 V6 XLT misfire

OK, so I moved coil on #4 to #6, and I got the misfire on #6.

Replaced bad coil and car runs smooth as can be.

Funny that each time I checked the coils they were OK. Maybe this was temperature dependent? No matter, problem solved!
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