simpsons721

Hi,

I just moved to colorado and wanted to know how to modify my truck for high elevation driving (low oxygen)

if you guys know the standard procedure on what to adjust please reply

and how difficult is this to do

thanks

matt

Volcom

Heavier right foot and get some momentum before the big hills

mt_goat

I just go up there and drive around for a few days and the ECU self-adjusts the fuel trims. It takes a day or two to start running better.

T-1000

I'm at 7,000 ft and I advanced the timing a little, it works pretty good.

abecedarian

As long as the engine warms up enough for the ECU to go into closed loop mode (using the O2 sensor for mixture feedback), the ECU will adjust fuel mixture on it's own. It may take a few trips down the road, stopping and starting the engine and warming it up, before the ECU updates its trim information and fully adjusts to altitude.
You may lose some power due to the thinner air at elevation. As mentioned, a slight bump in timing might bring that back.
Otherwise, you should be good to go without any problems.

tc

x a bazillion

The EFI will take care of the technical stuff.

87LVRunner

I added an intake to get more air moving through the engine. I also got a better exhaust, I think 2.5 inch. Those coupled with a timing advance seemed to help. I used to live in Highlands Ranch, just under 6K.

That, and just always drive downhill and you will be fine!

Moving to Vegas, my 4Runner feels like a hot rod now.

mt_goat

So did I:

khany2002

I know in the owner's manual, it gives you instructions on vacuum lines you are supposed to lengthen or shorten, to prepare the vehicle for high-elevation (above 6000 feet) driving. It says it will still run fine none the less though, if I recall correctly.

I could dig it up sometime when I get a chance.

87LVRunner

Show off!!... That's purdy!

mt_goat

Sorry, I couldn't resist.

DIRTCO

I live at 9500' and there are a few things I've done to try and get more power. When it comes to adjustments the only thing you can really do is adavance your timing, I usually run between 8-10 degrees. Also, if you have ever adjusted your air flow meter you will want to return it to stock (at least until you get it tuned to your liking). Other than that the computer will do the rest.

Air is your best friend, so an intake and header / exhaust are the first things I would upgrade. Those will help to flow what air there is faster and more efficient.

Like Mountain Goat, I finally upgraded to something with more power Forced induction is really the best way to get around the whole elevation thing

simpsons721

thanks for all the advice i will go ahead and adjust my timing