Posted by jimg.allentown on September 19, 2017 at 16:49:03 from (173.49.133.204):
In Reply to: ???????? posted by Greg1959 on September 19, 2017 at 12:02:57:
One of the peculiarities that I found when working in Ford dealerships was when folks came in with loss of power complaints at high altitudes. Then, power would return once they "floored" it. The explanation was that the computer adjusts the mixture to the altitude when the engine is started by reading the barometric pressure sensor - which was built into the B/MAP sensor on the firewall. while climbing a steep hill and increasing altitude, the mixture would keep getting richer and richer due to the lack of air volume. Once the driver opens the throttle fully, the system does a soft reset and the computer recalibrates for the current altitude and the engine picks up and starts running properly. Back in the years of 1989, 1990, and 1991, the 351W engines used a B/MAP sensor. Starting somewhere in the early to mid 1990s, they started changing over to MAF (Mass Air Flow) sensors which are more sensitive and more accurate. Loss of power results from less density of the air charge entering the engine.
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