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International Automotive Technicians Network
Re: Black smoke single injector?
Posted to HD/Fleet Forum on 7/23/2018

Dirty air filter Either a boost tube leak (which would cause less air to the motor and more fuel), or most likely a failed/failing injector(s). Check the balance rates of the injectors, should be +/-4 at idle when warmed up after a good hard run. If black smok... Login to read more.