Coil hookup?
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Junior User
Joined: Nov 2003
Posts: 99
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From: Oregon
Coil hookup?
Right, I got a Jacob's coil for my 390, and all new components along with it, 'cept plugs. Hooked it all up as best as I can know how, and now it seems to sputter a little bit until it got good and warm. decided to gap the plugs, went to .040(wasn't sure if the Jacob's coil was really good for opening the gaps .010 over stock). Still sputtered some at lower RPM's. put the stock coil back on for a comparison. Sputtered more now, and higher up in RPM's. Could the Jacob's coil been too much for my old spark plugs(Autolite 45's), or should I look elsewhere? Such as:the old coil has a "bat" post and a "dist" post, the Jacob's has "+" and "-" which is which, so I know for sure I have it hooked up right 
Any help is appreciated, and thanks for the help I've already gotten!
Any help is appreciated, and thanks for the help I've already gotten!
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Ok, Jacobs says you can open up the plug gap .007" from stock. If it's still sputtering with the stock coil back in place then I'd look at the other stuff you replaced and get it squared away before going back to the Jacobs. What else did you replace?
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 99
Likes: 0
From: Oregon
Plug wires, cap and rotor, and distributor with about 500 miles on it from my other 390 I killed. distributor worked fine on my other engine, although the failure was mostly cam related...on that thought, what is a "normal" level of play in the distributor shaft(think crank endplay here). Think when the other 390 ate the cam it could've damaged the distributor or moved the gear or something?
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
I'm at work now and don't have the specs handy on endplay or slop. The stock distributor uses bronze bushings. If you suspect there's too much play the easiet thing to do is exchange it instead of trying to fix it.
Trying to troubleshoot after changing a lot of variables is hard. I'd go with one change at a time to keep from pulling your hair out. Start at square one and proceed one step at a time. Sorry this is so vague.
Trying to troubleshoot after changing a lot of variables is hard. I'd go with one change at a time to keep from pulling your hair out. Start at square one and proceed one step at a time. Sorry this is so vague.
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