Posted by Janicholson on January 16, 2015 at 19:35:59 from (74.60.94.18):
In Reply to: I set the valves.... posted by BenH97 on January 16, 2015 at 18:02:21:
Backfiring is caused by the following: Combustion fire leaking out of the cylinder into the intake manifold. Caused by intake valve/s not seating (leaking), or not being adjusted even close to correctly. An exhaust valve not opening causing combustion issues including fire to sporadically be introduced into the intake because it was not expelled through the exhaust. Spark incorrectly getting to a spark plug when that cylinder is on the intake stroke. This results in combustion of intake mixture in the manifold and carb. Common reasons are plug wires in incorrect distributor location/s (cross wired). Cracks and carbon tracks in the distributor cap, causing spark to go where it is not intended. Also can be from a bad wire that forces radical high voltage, which then forces voltage to jump where it degrades the material of the cap. Wires leading to plugs being too close together and of poor insulation value allowing cross sparking. Excess fuel in the exhaust system (rich mixtures, failure to ignite a mixture in the cylinder then pushing it into the exhaust, and decelerating the engine allowing high vacuum to pull fuel into the cylinder too thin to burn, but still able to concentrate enough to explode in the exhaust as a spark from carbon or still burning fuel from a opening exhaust valve ignites it) The last one in parenthesis is pretty normal and common in vehicles with carburetors without electronic fuel shutoff on deceleration. A blown head gasket between two adjacent cylinders can also present flame to a fuel filled cylinder with the intake valve open. The above is the best thinking I have on this. Jim
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