Posted by Janicholson on December 27, 2008 at 10:25:22 from (68.112.156.69):
In Reply to: 656 pops when idling posted by Scott in Illinois on December 27, 2008 at 08:14:48:
Gas farmalls will miss once in a while at Idle (most gasoline engines will do it) when they do, they push unburnt fuel and air into the exhaust manifold. This ignites and makes a deep misfire/backfire type noise. If it has a flip rain cap on the exhaust, it will make it pop open and slam shut. If our tractors failed to do this, I would begin to look at the raincap to see if it was rusted up. Seriously if it runs well off idle, and is not a consistant cylinder misfire, ignore it, or consider it charming. Many tractors do not do it, but all mine, and the neighbors do. Fuel injection, electronic ignition/engine control, and modern valve setups in Automobiles have made many old sounds obsolete. JimN
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