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When driving my bus at night, i notice a fair amount of what seems to be sparks coming out of the left side tailpipe only. nothing is draggin on the ground, they are coming out of the pipe itself, and only on one side. with the bus stopped, you can stand at the back of the coach, give it throttle, and see them come out. it runs great, drives great, great oil pressure, not overheating. i'm thinking they are drops of fuel that didn't get completely burned, but wondered if anyone had any ideas on how to make it stop.
This is a long shot, but maybe your rack needs adjustment. Or maybe you are not operating in the right rpm ranges and building carbon that then flares up on acceleration? Do you have jakes? Is it possible that jake adjustments are off? Bill T.