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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 02-24-2011, 11:13 PM
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Weak spark, no power = pick-up coil

My truck has been running me crazy trying to figure out what was wrong with it. I had completed a 460 swap (replacing the 300 wheezer, don't get me started on what a disappointment that motor was) 2 weeks ago, but the BBF just did not seem to have the suds it should have. The first 1/3 of the throttle was great, but after that, there wasn't much there. It started and idled fine as well.

Long story short, after swapping many parts, it was the pickup coil in the distributor making the spark kinda weak, but not so weak that it had any trouble starting, which is kinda odd I thought. I searched and read many threads about weak spark, and they all either didn't start at all, or were hard to start. Mine was not like that. Also it did it hot or cold, which also seemed unusual, generally the pickup coil will start to falter when it gets hot.

Anyway, after swapping lots of parts, some new (like plugs and wires and cap and rotor, which it needed anyway) and some used, thanks to a generous friend with a supply of old Ford trucks, tonite I got it when I swapped the distributor out.

Now it runs like a 460 should, certainly more power than that old truck has ever had in it's life. I put a lot of time and money and busted knuckles into this deal, maybe now I can get some payback. I'm putting it right to work - I've got a 20' trailer to pull about 100 miles on Sunday.
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Old 02-25-2011, 02:55 AM
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I didn't know you did a 460 swap on your 300 truck. Thats cool that its running right now.

What was wrong with the 300, just old and worn out?
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Old 02-25-2011, 10:26 AM
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I gotta pull a trailer for the prison ministry I am in, it weighs about 7000# or so loaded and the Six was not up to that at all. It only had 175K on it but it was getting tired, it didn't even like the 1500# trailer I pulled for my church a few times. Mileage had also dropped - it used to get 18 but was down around 14-15 lately. I had been shopping for an F250-350 for the trailer work but then decided, hey, why don't I just drop a 460 in this truck?

I was all excited and tried to drive it to work today, but I smelled gas about 10 miles into the commute and pulled over, #7 injector is leaking, had to go back home. Euphoria delayed again...
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Old 02-25-2011, 11:11 AM
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Sounds more like you were out of time with old distributor. The PIP sensor (there is no pick-up coil in EEC IV distributors) is just a trigger for the ICM and has nothing to do with how much spark you get.
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Old 02-25-2011, 02:21 PM
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Sounds more like you were out of time with old distributor. The PIP sensor (there is no pick-up coil in EEC IV distributors) is just a trigger for the ICM and has nothing to do with how much spark you get.
Being out of time would not make my spark from the coil be orange, tho.
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Old 02-25-2011, 04:08 PM
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Maybe if you had a bad ground inside the distributor?

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Old 02-25-2011, 10:10 PM
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I do not if maybe you had a bad ground inside the distributor?
Maybe, don't know, I swapped the whole distributor, just figured it was the PIP sensor, it's working now, so not gonna mess with it. :-)
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Old 02-25-2011, 10:11 PM
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Replaced injector o-ring tonite, crossing my fingers I can drive it tomorrow for a whole day without something letting go. This has been more of a fiasco than I planned for - I don't think my truck is very happy about giving up it's original engine.
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