Haven't had a problem yet. There is an athmospheric pressure transduce that hooks up to the ECU. This transducer effects the fuel injectors "open" time duration. Is your bike running really lean at altitude? Have you checked for a fault codes at altitude when your idle drops?

 

I've had mine up to 11,000ft. It has dropped about 100-200 rpm, my dirt bike does the same too. Never acted like was going to stall though. This ecu system doesn't have all the sensors & programming that EFI cages have. Hasn't been a problem.....yet.

 

quote:Originally posted by girlzwarrior

Is there a sensor for this I need to check out?

Yes! The atmospheric pressure sensor is used for making compensations to the changes in the air density caused by the changes in the atmospheric pressure (particulary at high altitudes).The operating principle and function are the same of the intake air pressure sensor.

 

The Map sensor will do its best to compensate, but bottom line is there is less oxygen in the air at higher altitudes.

 

XZVS - ? What is a MAP sensor. Manifold Absolute Pressure?? Is this another term for the Atmospheric Pressure Transducer? Or the ECU's Ignition control MAP which is a 3D lookup table burned into the ECUs (E)PROM. I've heard of a Mass Air Flow Sensor and an O2 sensor. The Warrior has neither. Wish it did, we wouldn't need a PCIII and maps for it. The PCIII MAP will only "compensate" for the altitude the PCIII was programmed at. But I could be gravely mistaken (misundertaken[/emoticons/emotion-2.gif])

 

yup-- Manifold Absolute Pressure- been called a map sensor on cars forever- reads barometric pressure. Mass air flow mesures the volume (flow) of air entering the engine (note: sometimes the 2 are combined) O2 reads the exhaust gas (by tempreature in most cases) Most fuel injected engines also use an air temp and a coolant temp sensor also.