I followed that logic for far too long, and Cummins never did find my problem.until AFTER the warranty has expired! Then "Oh, look at that. Changing parts until a problem is solved is the biggest reason we fix our own trucks, too many of us have paid these "technitions" too much money to do exactly that instead of actually diagnosing the problem properly in the first place. I agree that the EGR is the most likely culprit, but it is by no means the only possibility. liner starting to drop allowing coolant into combustion chamber injector O-ring leaking coolant into combustion chamber injector cup leaking coolant into combustion chamber If it appears to be "burning" the coolant and these are not the source of the coolant, you may have If you can't make the EGR cooler or doser leak while the rad is pressurized they are not likely your problem. if No, remove exhaust pipe behind the doser and check for coolant use a light and a mirror to look into the back of the cooler for evidence of coolant leak remove the two 10mm bolts at the back of the EGR cooler after that i talked to a few more knowlegable mechs and they sugested to change egr cooler so thats my project for this week. Oh ya it does it quite a bit, like its going through a regen. I fololowed that truck one day across I88 and it seemed to blow alot of blueish white smoke for quite a long time and i asked driver if it did this alot. (11-14-2016 )milkman4282015 Wrote: Thanks guys for all the info! I checked everything that yall sugested except testing under load. See if the coolant system is rapidly building pressure only under load. * Put a pressure test kit on it with an extension hose so you can see the pressure and take it for a spin under heavy torque load. It is getting into a cylinder and trying to hydra-lock it. * when you crank it, it should not have a first-rollover hesitation in the engine. * Crank it up with the Doser pipe still loose and see if the Doser injector is getting wet/damp while it idles. * Check the air tanks for excess moisture. * Remove the crank case filter housing and look for greenish/slimy residue in the underside of the cover. a gallon a day would make it fill up and have too high oil level. Also look for leaks on the ground the next morning. Also take loose (at both ends) the pipe the doser injector is attached to and see if it is not oozing out of the Doser injector, and/or the turbo. * Pressurize it up to 20-psi and let it sit overnight with the pipe off the back side of the EGR cooler open. * Replace the radiator cap/pressure relief cap with new one(s)!.
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