Before we start, yes the Milage is correct. I work as a Mechanic in Afghanistan for the Military. These trucks are low milage but ran extremely hard. This truck is equiped with a 6.0L powerstroke. The truck when runs okay till its within opperating temp and then will start dumping white smoke. This smoke is the result of a fuel issue. Recently this truck has has 8 brand new injectors, glow plugs & harnesses, an injector harness(because back 2 FICM plugs were broken), a new FICM, and a Camshaft position sensor. Now for the weird part, I recieved a tip from sombody to unplug the engine oil tempature sensor to put the PCM into manufactuar default for determining fuel quanity, I reshearched on Mitchell to make sure this would actually work and it did. Unplugged the truck runs great never any smoke and zero driveability issues. The truck never sets a DTC untill you unplug the sensor and when unpluged it sets the expected Engine oil temperature signal high. Yet runs flawless in manufacturer default. I conducted all the voltage tests and and continuity tests at the sensor and the PCM, and then alos isolated the circuit and checked for any shorts to ground. I found nothing, the entire circuit works perfect exactly as it should. So I know it runs correct unplugged because it makes the PCM determine fuel quanity by manufactuar default, but what could cause the fuel problem in the first place without settign a single DTC or cylinder contribution/balance fault. My IDS program and Modis Scanner read the entire system workign properly.
Wednesday, February 20th, 2013 AT 4:13 PM