GregH Posted June 20, 2007 Share Posted June 20, 2007 I was so missing my first 6.4L cab-off. I actually had to wipe away a tear as I watched it's tailights fade into the distance. You can only imagine my elation when I saw the familiar glow of it's pearlescent white exterior pull into the parking lot today. Popped the hood and, joy, the engine crankcase is overfilled again! About 4 quarts in 2000 miles! Ok, so anyone else know what the scoop is on these trucks? It passes every high pressure test I've done to it, no leaks at any injectors while commanding 25Kpsi and valve covers off, high pressure pump has been replaced per hotline. It's been generating 1 to 2 quarts of oil per 1000 miles since it was new (11,000 miles on it now). The truck stays on the road. No excessive idling, lots of highway miles, no excessive towing. The owner drives it hard, but doesn't beat it. Excessive white smoke present during some idle regenerations. No abnormal engine noise present. I've got a field service engineer coming out in a few days. Until then, does anyone have any insight? Quote Link to comment Share on other sites More sharing options...
HGM Posted June 20, 2007 Share Posted June 20, 2007 Have you monitored Short Fuel Trims to get an idea if the ECM is correcting for one particular cyl? I guess we can assume it runs good, right? At 24650psi, the Hi Pressure test allows for 465psi variation. I would think that losing 465psi could create about 4qts over 2k mi... Just a thought, sounds like an injector leaking to me(internaly)..Good luck, keep us posted... Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted June 20, 2007 Share Posted June 20, 2007 I agree. I would be looking at short fuel trims when the engine is hot and pick on the injectors. Quote Link to comment Share on other sites More sharing options...
GregH Posted June 20, 2007 Author Share Posted June 20, 2007 I have monitored short term fuel trims, and didn't see variations over about 6%. As for the results of the high pressure test, maximum deviation was 25psi - even at 24650... Truck runs great. Hotline said, and I quote, "The oil level can increase by up to 1 inch in 3000 miles before it becomes a problem." wha?? Quote Link to comment Share on other sites More sharing options...
HGM Posted June 21, 2007 Share Posted June 21, 2007 I have monitored short term fuel trims, and didn't see variations over about 6%. As for the results of the high pressure test, maximum deviation was 25psi - even at 24650... Truck runs great. Hotline said, and I quote, "The oil level can increase by up to 1 inch in 3000 miles before it becomes a problem." wha?? OK, stupid question time.... Are you sure its fuel? Not coolant? Had to ask.. Are you doing the fuel test hot and cold? Does this truk happen to have a block heater? Quote Link to comment Share on other sites More sharing options...
GregH Posted June 21, 2007 Author Share Posted June 21, 2007 90% sure that it is fuel. Since I smoke, my sniffer isn't the best in the world. But I got verification from other non-smoking techs who said it was raw fuel. I've run the test while looking at the IDS screen many times both hot and cold with the same average deviation. As for physically watching the injectors, I've only done that cold - since there is no coolant in the engine if the left side valve cover is off. Not a stupid question at all. I've learned over the years that when I get stumped, that's the time to really listen to and think about all questions posed by others. They have a habit of turning a week long saga into a 5 minute forehead slapper. Thanks for the input HGM and everyone else. Quote Link to comment Share on other sites More sharing options...
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