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100IH · 03-26-2018, 11:05 AM

Running too rich creates un-burned fuel in exhaust track, port, exh. manifold and/or muffler & tailpipe. Let in fresh air and it can ignite if hot enough. Other factor is lean misfire. Engine can not burning fuel efficiently in a given cylinder and the un-burned fuel is available to ignite under the right conditions as above.

03-26-2018, 11:05 AM	#5
100IH Senior Member Join Date: Dec 2011 Location: SW Idaho Posts: 970	Re: backfire? Running too rich creates un-burned fuel in exhaust track, port, exh. manifold and/or muffler & tailpipe. Let in fresh air and it can ignite if hot enough. Other factor is lean misfire. Engine can not burning fuel efficiently in a given cylinder and the un-burned fuel is available to ignite under the right conditions as above. Last edited by 100IH; 03-26-2018 at 11:34 AM.