When drove up MT Evans, my truck did what i was expecting on the way up. I was getting alot of black smoke and lost power. WHen i started it up to come down my truck poured out blue smoke, this was with very little amout of throttle.

 

High Altitude does weird things to these engines. When I was going over the Rockies, it felt like I lost 100hp

 

Have not had my truck up there. Sounds normal. Black smoke is lack of air, that's how I feel when I walk up. You must use less throttle and lower gears.

 

it was amazing my truck looked like a two stroke that you mixed the oil to rich

 

I live in Colorado and drive in the mountains a lot. At high altitude when descending you are applying much less throttle than going up or cruising. If you start with a cold engine, it will take for ever to warm up and you may get lots of WHITE smoke. If your engine is at operating temp to start with, the combustion chamber temp can still drop below normal if descending long enough. WHITE smoke is usually unburned fuel, BLUE smoke is oil. Hope that's not the case.

 

i was thinking oil too so i checked it, it was at the exact level it was when i left oklahoma.

 

diesel fuel is oil......just a lighter grade. It will puff blue smoke if there isnt enough air and your not on the throttle. It goes from white to blue to grey to black.

 

Mine does the same thing when its cold, they all will the fuel can't burn completely and theres not much air up there anyways. don't worry about it.

 

i appreciate it guys

 

my 96 did the same thing the 4th of july weekend going from cody to devils tower after cresting the pass and going down grade. the mechanics at work say all is ok, not to worry. its been fine since.

 

Mine does that leaving my house in the morning, I'm at 7,000ft. When I plug it in though it does not happen.
I wonder how well my truck would run at sea level!

 

at home which is around 400-800ft my truck runs great. It was like a night and day difference when i was in colorado.

 

I may have to take a road trip to the lowlands to see what I have been missing!