When the engine was changed,did they use your old heads or rebuild your heads as well,if the valve guide seal "umbrella" or "o" ring seal and valve guide has excessive tolerance,oil could be seeping into the cylinders through the guides,also if your oil galleys in the head are clogged it will keep allot of oil in the valve tran area,if it sits overnight or not burning off when you start don't let warm up shut off and startup again i agree with mrford49 Blueish/gray smoke is OIL or a Petrolium product,solid white has usually been anitfreeze/water mixture,black is always fuel.
also did the Ford Steelership do a dry and wet compression check,doing a dry test remove all plugs and crank over,check specs for proper psi,use a squirt oil container and squirt 2 to 3 shots in cylinder through spark plug hole redo test again and see if compression goes up,this will tell you the condition of your Rings.
Ford put a complete engine in my truck only using the intake from my truck. Yes they did a dry and wet compression test and there was a very little differance in compression. They where trying to fix the problem. The factory rep is the one that told them to put a complete engine in my truck. They never did die in the oil or coolant for any idea where it was coming from. My truck was the first one they had put an engine into a new Super Duty. They pulled the cab and front end off all at once. Every thing was right there to work on with plenty of room.
I tried this today when I was moving the truck on my yearly car wash (washed the Excursion, Range Rover, and motorcycle), and I didn't have the truck smoke. However, the rest of the time the thing is running for at least 15 minutes of driving, so maybe the fact that I normally give it good use means that it's more tolerant to the occasional short run.
Just to add to the thread to maybe help put anyone at ease that's worried about a little blue from thier V10 at start-up. (I believe it's oil causing the blue smoke not fuel. I do wonder (not likely) if maybe fuel and moisture burning together might burn blue?) but regardless,,,
2002/V10/4x4/CC/SRW/LB - aprox 57,000 miles or 91,500
It's been a little bit chilly here and the air seems to feel very moist and heavy the past couple nights and both mornings I happen to be tinkering with my Truck. I move the Truck into possition because it's parked very close to the house. It runs for maybe 1 minute then sits for upto several hours. Each time the past couple of days when starting the Truck to move it back to it's regular parking spot it blows a little blue for maybe 1 to 3 seconds then a few seconds later it seems to push more than normal white clouds of moisture. The moisture lasts aprox: 1-3 minutes while continually dissipating to a normal flow. Under normal driving conditions I can't say I've ever seen even a hint of blue and I am one for being aware of things like that.
If you're noticing blue smoke, it's possible you're getting some oil seepage from the valve seals, which I would buy as a possibility.
Fuel can do this, too, and sometimes I notice it can be difficult to tell fuel vs. oil per se. Yesterday my friend said her car wouldn't start ('00 Chrysler Sebring) and asked me to come look at it. I could tell pretty quickly it was flooded (yes, fuel injected engines will flood on occasion due to hitting specific conditions that the factory screwed up on in calibration), and just cranked it with the gas to the floor until it caught. The smoke that came out was fuel, but someone else might not have been able to tell that it was fuel vs. oil.
Just to let you guys know it did this the day after the NEW engine was installed and any time I wanted it to do this. And the Ford mechanics just could not believe it did it after all this. So I do not believe it is an engine mechanical problem. I believe it is design problem with the engine and its emission system.
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