? - high altitude & fuel injection

[cjean]

Does anyone know if a person should add something to the gas on older fuel-injected engines when driving in high elevations? We have an '87 2.2l gas that we are not sure how it will act at 7,500+ altitude. Any tips appreciated!

[foxtrapper]

No need to add anything, it'll self adjust to the altitude. That's what the various air flow/density/pressure meters are for.

[cjean]

ok, but the question is, is this true for engines that are older - 1986/87?

[Wis Bang 2]

Originally Posted by cjean

ok, but the question is, is this true for engines that are older - 1986/87?

My '88 S-10 [Throttle Body Injection was introduced in 1986] had a MAP sensor it measured the Manifold Atmospheric Pressure by reading electronically the deflection of a diaphram caused by engine vacuum. Every few seconds the computer decided the engine demand based on the amount of work you are asking. The Throttle Position, temperature and Oxygen sensors help decide how much fuel you get. The effect of changing altitude would affect the MAP and be calculated into the picture as you move.

[Beeman]

Some early models had a MAP (manifold absolute pressure) sensor and a Baro (barometric pressure) sensor. The MAP measured vacum in the manifold and the BARO monitored barometric pressure constantly. Then in the interest of simplifying things they eliminated the BARO sensor. What is done when the BARO sensor is eliminated is the engine control monitor takes a barometric pressure reading in the instant your car is started. It uses this as it's base reading for the drive cycle. When you shut off the vehicle and restart it there is another reading taken and tht's the base for that drive cycle until the key is shut off.
So to answer your question it will be fine if everything is working correctly.

[foxtrapper]

If it's fuel injected, it self adjusts. Regardless of when the fuel injection was made.