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Restoration & Repair Tips Board

Engine backfiring when starting

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Albert Grindle

12-12-2004 19:13:06

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Hello everyone I have an International BD-220 gas engine that I have brought back from the dead after 30 years of rest. All it needed was a fuel pump, kinda unbelieveable. When I try to start it cold, I am having severe backfire. It usually takes some starting fluid to get her firing then its just a matter of playing with the choke. A good 5-10 minute process. Once it starts, it runs very good and will start right up again when warm. Could the timing be off? Or am I looking at a ring/valve job? Those were my guesses, but since it runs so smooth I am having some doubts. Any help appreciated. THANKS!!!!

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Albert Grindle

12-13-2004 11:59:09

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Re: Engine backfiring when starting in reply to Albert Grindle, 12-12-2004 19:13:06

Thanks for the responses. I have pretty much ruled out timing. Once it starts going I swear it sounds like a new engine. It doesn't backfire or anything when I play with the governor either. I will defiantly take a look at both of your suggestions and see what I can come up with. If anyone can think of anything else I'd appreciate it THANKS AGAIN!

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PatrickK

12-27-2004 15:01:06

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Re: Engine backfiring when starting in reply to Albert Grindle , 12-13-2004 11:59:09

I"m having a very similar problem with my 300 utility (gas). When I pull out the choke it runs ok but it will only idle when the choke is off. (If I try to rev it it backfires.) I"ve been told theres probably water in the gas thats messing up the carb>Ice chunks. Mine ran fine before it got cold. I"m going to put in some water remover and some fuel line antfreeze and see if that helps.

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txblu

12-14-2004 05:59:23

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Re: Engine backfiring when starting in reply to Albert Grindle , 12-13-2004 11:59:09

'73 Vette hit on a good point. Iffin the plug wires are crossing each other and the insulation is breaking down, you could have a situation where one cylinder is on the intake stroke, intake valve fixin to close and come up on the compression stroke and the spark intended for another cylinder jumps to the plug on this cylinder and fires it off.

Temp could be moisture. Not gonna back up and look as I'll probably loose this, but I think you said the problem was cold. Moisture and high voltage don't like each other. Once you get things warmed up it dries out the moisture and you're there.

Might check for a crack or carbon tracking on the inside and outside of the dist cap. That could be a source of misfiring also.

HTH.

Mark

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chvet73

12-13-2004 09:47:58

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Re: Engine backfiring when starting in reply to Albert Grindle, 12-12-2004 19:13:06

Check your plug wires. My Corvette had a wire that would not always work. That cylinder would have unburned fuel in it. And that would cause a backfire. Took me forever to find out that was the issue.

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txblu

12-13-2004 06:44:47

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Re: Engine backfiring when starting in reply to Albert Grindle, 12-12-2004 19:13:06

Backfiring is inlet fuel igniting cause someone left the back door open er ah exhaust explosion appearing at the input.

Wild guess here. Since it runs ok hot, timing and such is not the problem or it would be consistent.

I'm going for burned/sticking-open intake valves. When hot they expand and seal up.

If you think it's timing, you could loosen the dist and rock it back and forth while craking cold and see of it helps. If so it would be a band-aid for your real problem.

I thought about glowing lead embers too, but that would be a hot backfiring type problem, not cold.

Run a compression check cold. All cylinders should be within 10 psig of each other. Actual pressure depends on design compression ratio and current ring wear. Could be anywhere between 80 and 150.

HTH,

Mark

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