High altitude question

[Mark.Smith]

Hey all,



I recently moved from Texas to Colorado, basically from sea level to altitudes from 6500-8500 feet. I noticed the truck smokes a little more now(black fuel smoke), is this normal?

 

[Bob4x4]

Completely normal

 

[AH64ID]

Yup very normal.

I don't hardly smoke at 3K feet at home, but 8K feet and I'm blocking out the sun if I am not careful.

 

[GHarman]

Consider bumping up your timing? GregH

 

[Bob4x4]

Consider bumping up your timing? GregH

ecm controlled

 

[Bob4x4]

A bit higher rpm and a bit less peddle will help and is free

 

[AH64ID]

A bit higher rpm and a bit less peddle will help and is free

Yup. I can be 100% smoke free at 8K feet if I just raise my shift point about 200 rpms. . well as long as I get thru 1st without smoke, which is easy unless I have the trailer hooked up and its hot out.

 

[GHarman]

Depending on where you moved to in Colorado. Emissions testing is required at various places along the front range. Maybe your ECM is the learning kind that will automatically re-adjust for Barometric pressure? Yes! Adjusting shift points and keeping your foot under control help out no matter where you are:-laf

As you can see by my sig. , I dont have that problem and it still blows black smoke! :-lafOo. Especially when passing bicyclists:-{}! GregH

 

[Andres]

I put +90 hp injectors in my Cummins conversion. It's an offroader. It hated altitude and overfueled. Plenty of power in 4wd at 10K' but high egts. Go to 4wd low, it bumps rpms to 1900-2300, no problems. Turned off OD ('03 HO motor) and 50 mph and EGT's were something like 200 degrees cooler.



Just not enough air up there, especially on those mountain trail passes.



Came home and pulled injector nozzles. Yeah they were fine at anything under about 5000' but raised EGT's and smoke at high elevations.

 

[Mark.Smith]

Thanks for all the replies, I'll raise my shift points!

 

[BIGNASTY]

Consider bumping up your timing? GregH

Hotter sparkplugs and new dist. cap and rotor When we moved to MT from CA did the same thing. smoke that is

 

[GHarman]

Hotter sparkplugs and new dist. cap and rotor When we moved to MT from CA did the same thing. smoke that is

Consider bumping up your timing?

:-laf! I can do that with mine! sans spark plugs and distributer cap! GregH