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John Deere Tractors Discussion Forum
Show Parts for Model:

730 gas miss

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johndeeregreg

01-11-2018 22:37:05




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our 730 will miss on 2, if i pull the plug wire out of the distributor cap and hold it against the cap right at the to where wire goes in it will shoot the spark up to the wire and fire, i can then put wire back down like its suppose to be and it will keep firing but drops that side when a load is applied. what should i check first? i haven't spent any time checking condition of wire end or cap but cap has been replaced in the last year and a half and the wires aren't that old either. has pertronix electronic ignition and coil, copper wires, and autolite 3116 plugs. i have been told that carbon core plug wires should be used with the pertronix systems but i'm not sure why.

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johndeeregreg

01-12-2018 06:30:09




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 Re: 730 gas miss in reply to johndeeregreg, 01-11-2018 22:37:05  
ok, ill check plugs and get the right wires.



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D-

01-12-2018 05:57:22




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 Re: 730 gas miss in reply to johndeeregreg, 01-11-2018 22:37:05  
Missing under load is usually plugs, even though they look good.
Try switching sides with them.



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David G

01-13-2018 07:02:40




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 Re: 730 gas miss in reply to D-, 01-12-2018 05:57:22  
IMHO, missing under load can be anything on the secondary ignition, as load increases the compression pressures which increase the voltage required to jump the plug gap This means cap, rotor, wires and plugs are all suspect, I would not narrow it down to plugs.



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ET

01-13-2018 08:05:44




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 Re: 730 gas miss in reply to David G, 01-13-2018 07:02:40  
Plugs are very easy to check first before you start spending money.



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ET

01-12-2018 04:18:13




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 Re: 730 gas miss in reply to johndeeregreg, 01-11-2018 22:37:05  
If you switch cylinders with the spark plug does the problem follow the plug or stay with the cylinder? I could just be a bad plug.



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JD Seller

01-11-2018 22:54:50




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 Re: 730 gas miss in reply to johndeeregreg, 01-11-2018 22:37:05  
You need to change the plug wires to resistant wires. You going to ruin your Solid state ignition if you don't. The resistant wires make there be more voltage at the spark plug. Your holding the wire away from the plug is doing the same thing and that is why it starts firing then.

I would recommend using the wires that your ignition system recommends.



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620rookie

01-13-2018 06:18:18




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 Re: 730 gas miss in reply to JD Seller, 01-11-2018 22:54:50  
I have a 1952 60 that I tractor pull with. One of the first things I did when I purchased it was put petronics Electronics in it. I also put in stainless steel plug wires at that time. It runs great, has never missed a beat since then. That was four years ago. I've also been able to increase the spark plug gap to 0.0050 with increased power output.



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JD Seller

01-13-2018 21:58:23




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 Re: 730 gas miss in reply to 620rookie, 01-13-2018 06:18:18  
By widening the plug gap your making the voltage go up there.



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Pete in MD

01-13-2018 07:40:11




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 Re: 730 gas miss in reply to 620rookie, 01-13-2018 06:18:18  
You mean 0.050



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620rookie

01-13-2018 09:02:54




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 Re: 730 gas miss in reply to Pete in MD, 01-13-2018 07:40:11  
Yes thanks



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