madj80

Ok, so I just moved to Denver was wondering if I should do anything to the car to adjust for the higher altitude? Someone told me to pull the main fuse from the ECU to reset it, but I am not sure.

GEB

I don't think you need to do anything. In the old days of carburetors, I think you had to switch out the jets ... but with fuel injection, I don't think you need to do anything. I think your MAP sensor (or something like it) makes the adjustments automatically. If it was me, I would probably take my car to "Courtesy Acura" in Littleton for my next oil change and ask them if anything needs to be done.

madj80

Thanks, I appreciate the info. Courtesy is where I was going to take my car in to this week.

Artwork

Welcome to Colordo..there are a few of us up here.

scalbert

You don't need to do anything. There is a barometric sensor in the ECU and the MAP reads manifold absolute pressure. So all needed data is known on how to compensate for the greater altitude.

NSX-Tuner

Correct me if I'm wrong... but I believe that the ECU also does some relearning for driving conditions to fine tune what the maps contain.

gto2050

You can speed the process by disconnecting the negative lead from the battery for 20 minutes. The ECU resets then and "learns" faster.

scalbert

Correct, there are fuel trim value to adjust the base pulse width as needed. This is used to adjust for clogging fuel injectors, etc.

scalbert

It doesn't take twenty minutes, less than a minute is really needed, and it will begin to adjust the fuel trim values imediately.

King of the Road

Either way, you will lose some power at the higher altitude

Slimey

Unless you're supercharged/turbocharged!

scalbert

Even then you will, just not as pronouced. That is also the nice thing about turbos; the ability to easily turn up the boost a little to compensate. In fact, the last gen RX7 actually did this on its own based on its barometric pressure sensor.