NEED HELP: 98 F-150 4.6, missing bad! - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 14 (permalink) Old 01-13-2010, 05:17 PM Thread Starter
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Angry 98 F-150 4.6, missing bad!

Hi there,

I have a 98 F-150 Later model with a 4.6 in it. I had the motor swapped 10,000km's ago and it ran good at first. But over the past month has ran like a bag of you know what.

Took it to the mechanic, first there was a cracked spark plug, so put new plugs on, then their was a vac line off, put back on. Checked it out mechanic tells me there is a "moisture problem" that they think is the issue as to why it still misses.

When driving it misses bad when cold, then goes to an intermittent miss once truck is warmed up. But when towing my trailer with quad on it, roughly 1000lbs, it misses like crazy and has next to no power at all.

Any ideas where to start/look would be greatly appreciated. My thoughts are it's either intake related or bad coils.

Thoughts opinions appreciated.

Thanks for your time,

Gavin
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post #2 of 14 (permalink) Old 01-13-2010, 05:26 PM
 
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what exactly is the moisture issue he's talking about?



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post #3 of 14 (permalink) Old 01-13-2010, 06:09 PM Thread Starter
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Not sure, he just said there's moisture under the hood. He didn't say specifically anything.
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post #4 of 14 (permalink) Old 01-13-2010, 06:16 PM
 
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did you have to cut or splice into any wires when you replaced the motor?



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post #5 of 14 (permalink) Old 01-13-2010, 08:38 PM Thread Starter
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Nope, had a 4.6 in there, replaced it with the same 4.6 triton motor. All wiring harnesses etc were the same across the board. That's why i'm assuming that it's a bad coil or a bad wire.
The garage said it may be that as well. And being mechanically inclined and previously owning a talon. lol. nightmare! Generally a miss is due to intake leak or spark issue.
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post #6 of 14 (permalink) Old 01-13-2010, 09:14 PM
 
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yup. Was just checking cause if you had cut a wire and it wasn't sealed properly and with the moisture



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post #7 of 14 (permalink) Old 01-14-2010, 03:00 PM
 
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it could be moisture in #5 or #4 spark plug hole,#5 would be from a thermostat leak and #4 would be from the heater hose clamp(both very common)


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post #8 of 14 (permalink) Old 01-14-2010, 07:36 PM Thread Starter
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Will look into the spark plug holes and see if there is moisture in those specific plug holes. Will also check for thermostat leak and heater hose leak. Get back to you hopefully tomorrow on results of search.
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post #9 of 14 (permalink) Old 01-30-2010, 02:18 PM Thread Starter
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Checked out the spark plug holes and everything is dry. It has been running better since the temperatures have gone back up to the 0 or low +'s. So it appears that it only has a real issue when it's cold or when it's cold out. Which doesn't help me any as it's a work truck and I do snow removal with it lol.

Any other ideas on what I could check?

Thanks for the help, hope we can get this solved.
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post #10 of 14 (permalink) Old 01-30-2010, 02:34 PM
 
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Maybe coil packs/plug wires?? i dunno.

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