6.9 diesel diagnoses and troubleshooting. The first purchase of this truck showed major signs of smoke. After testing the compression all the way around one of the cylinders compression was low, around 150psi, and all the rest were around 350psi. Pulling all the injectors for replacement, the one cylinder with low compression had substantial carbon build up around that injector. New injectors still had smoking problems. Next replaced head gaskets due to the eventual head gasket breaking apart even more and causing cylinder compression to enter the coolant system. the radiator blew apart from the pressure and smoke along with water were shooting out the radiator inlet. New head gaskets were installed. Smoke was still coming out the pipe. tested compression all the way around with all around 400psi. Tried using tranny fluid and diesel mix to clean out injection pump, did not help. Last resort new/used injection pump for $54. After the replacement of the pump the engine ran without any smoke. Total tune up cost: $100 injectors, which did not need to be replaced, injection pump $54, and head gasket set $116, plus our own labor of course lol. Not bad though.
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