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GLessardJr · Jan 12, 2011, 08:11 PM

Truck runs great until it reaches normal operating temp. Then it acts as though several cylinders or injectors are shutting down. The problem is accompanied with bellows of grey smoke. I disconnected the EGR a year ago, but I did check it again to make sure it was closed. When the truck cools down, it runs perfect once again. Anyone??

TxGreaseMonkey · Jan 12, 2011, 09:08 PM

. Check the fuel pump. It may be worn and exhibiting similar characteristics described in Item 6 below:

https://www.askmehelpdesk.com/cars-t...ml#post1415281

. Ensure the oil and filter have been recently changed and that the oil is up to the FULL line.

. White (grey) smoke is a sign of water vapor or fuel that has been atomized, but not burned. Water vapor may be present in the fuel, or water may be leaking into the cylinders from the cooling system. Also, air in the fuel can cause white smoke. White smoke usually occurs when there is not enough heat to burn the fuel. The unburned fuel particles go out the tailpipe and typically produce a rich fuel smell. It's not unusual to see white smoke in the exhaust, during cold weather, until the engine warms up. Bad glow plugs (burned out, coated with carbon, or not receiving proper start-up voltage) or a faulty glow plug control module can cause white smoke on engine start up. Low engine cranking speed may also produce white smoke. If white smoke is visible after the engine has warmed up, the engine may have one or more bad injectors, retarded injection timing, or worn injection pump. Low compression can also be a source of white smoke.

GLessardJr · Jan 14, 2011, 12:02 PM

Truck was a gallon low on oil when problem started, added necessary oil and fixed leak which was the filter cover loosened. Fuel pressure seems to be good.

GLessardJr · Jan 15, 2011, 09:56 PM

Had diagnostic computer put on it. Showed these codes. Fault in Camshaft Position Sensor, Fault in Crankshaft Position Sensor, and the FICM showing slightly low voltage, but only at an idle. Changed Crankshaft sensor last year, so I changed Camshaft sensor today. STILL have same problems.
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