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Electronic Ignition Can Surprise You


 
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LarryM
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Joined: 27 Jul 2008
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PostPosted: Wed Oct 03, 2012 4:55 pm    Post subject: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

I recently shut off a tractor with Petronix and when I turned the key on 2-3 minutes later it started. It seems to fire every time you turn on the key. The motor was just in the right spot to fire and go. That sure could be dangerous if your not aware of it.
 
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CNKS
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PostPosted: Wed Oct 03, 2012 5:55 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

Wired wrong or something wrong with the switch.
 
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JMOR
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PostPosted: Wed Oct 03, 2012 7:04 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

CNKS wrote:
(quoted from post at 21:55:48 10/03/12) Wired wrong or something wrong with the switch.
Is that a statement or a question? If a statement, why did you say that?
 
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Janicholson
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PostPosted: Thu Oct 04, 2012 10:43 am    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

The key in a points and coil system (and your electronic system) is just one more switch in the path of electrons. When turned on, or off it can spark. My uncle had a 400 farmall start and run (in reverse) for a big spiral in the barn yard that ended with the 3 16s FH plow in the tack house, and his wife shutting it off by wiggling the defective Key switch. Jim
 
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mkirsch
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PostPosted: Thu Oct 04, 2012 10:56 am    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

I have heard stories of tractors starting during lightning storms and driving off on their own.
 
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John G. Hasler
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PostPosted: Thu Oct 04, 2012 12:32 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

The classic Kettering circuit can only generate a spark when the current through the coil is interrupted (obviously, the defective switch in your uncle"s tractor managed to interrupt it). Thus it cannot fire at turn-on under normal circumstances. The Petronix system is a bit more complex and I can believe that it can generate a spark on turn-on, though it should have circuitry to prevent this.
 
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CNKS
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PostPosted: Thu Oct 04, 2012 5:02 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote


You don't see a question mark -- something is defective, as it should not do that.
 
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scotc
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PostPosted: Sat Oct 06, 2012 2:50 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

And diesel pickups with a manual trans driving off on its own after the owner replaced the fuel shut-off solenoid with a cable, and it then got hit in a parking lot.
 
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kossuth
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PostPosted: Sat Oct 06, 2012 8:27 pm    Post subject: Re: Electronic Ignition Can Surprise You Reply to specific post Reply with quote

LarryM wrote:
(quoted from post at 17:55:05 10/03/12) I recently shut off a tractor with Petronix and when I turned the key on 2-3 minutes later it started. It seems to fire every time you turn on the key. The motor was just in the right spot to fire and go. That sure could be dangerous if your not aware of it.
If that truely happened I would contact Pentronix and figure out what happened. Yeah it might have been a 1 in a million shot, but something isn't right.
 
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