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Ford 9n backfires

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rich

03-11-1999 04:44:27




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any suggestions on why tractor is backfiring




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signman

03-12-1999 05:17:52




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 Re: ford 9n backfires in reply to rich, 03-11-1999 04:44:27  
You didn't mention if the tractor is backfiring and won't start or if backfires while running. Also, is it backfiring through the exhaust or intake. First you need to check timing of both spark and valves. If the tractor is has been running and produces an occassional backfire chances are it is not in the valve train. Look further at the electrical. Check distributor timing then proceed to look at the cap and rotor for carbon tracks that indicate cross firing. The wires are culprits in many situations if they are cracked or leaking they will jump from one to the other. Remember electricity will follow the path of least resistance. It is harder for a spark to jump under compression than one that is under little or no compression. Thus you have a cylinder firing out of time while you have unburnt fuel accumulating throughout the exhaust. Another culprit can be a worn distributor shaft or bushing that can allow the points to open out of time, producing erratic firings. Without more information it is hard to diagnose your problem. Carburetion problems can be confused with backfiring.

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Bob

03-12-1999 22:15:55




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 Re: Re: ford 9n backfires in reply to signman, 03-12-1999 05:17:52  
I think signman got all the electrical trouble spots and I will add one more from the fuel side. Check to see if the engine is getting enough fuel. A lean mixture burns slower than a rich one. If the charge is still burning when the intake opens than you get the backfire. Try pulling the choke out a little to see if it goes away. Bob



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