Power Commander III

[3dogs]

Here is a complete guess at the problem being described. It is possible that on the GenII bikes the MAP sensor also acts as a BARO sensor. Ford used the strategy in the 1980's on EFI cars. When the ignition key is first turned on, the ECU uses the MAP sensor to take a barometric pressure reading (altitude) and adjust fuel delivery for the altitude that the engine is being started at.

Once the engine is started the MAP sensor functions as an electronic vacuum gauge and measures engine load. These early Ford EFI cars had a similar problem to what is being described on the FJR in that they would run fine until they were driven from a lower altitude to a higher one. The fuel system would run lean (hesitation/surging) until you shut the engine off and restarted it at altitude.

 

[Last Chance]

Here is a complete guess at the problem being described. It is possible that on the GenII bikes the MAP sensor also acts as a BARO sensor. Ford used the strategy in the 1980's on EFI cars. When the ignition key is first turned on, the ECU uses the MAP sensor to take a barometric pressure reading (altitude) and adjust fuel delivery for the altitude that the engine is being started at.
Once the engine is started the MAP sensor functions as an electronic vacuum gauge and measures engine load. These early Ford EFI cars had a similar problem to what is being described on the FJR in that they would run fine until they were driven from a lower altitude to a higher one. The fuel system would run lean (hesitation/surging) until you shut the engine off and restarted it at altitude.

Well, your "guess" sure fits the symptoms. What did Ford do about it? :huh:

LC

 

[mike25]

It's always in (3rd) gear and at 2500 rpm or less, every time.

Why are you riding @ below 2500 in 3rd gear???

 

[Grumpy]

You guys need to ask Jeff Ashe how his '07 has been doing? He lives at sea level and is doing a Canadian Rockies trip on his way to WFO in Park City. He runs a PCIII and I've not heard him complain about this problem.

Jim

 

[3dogs]

Here is a complete guess at the problem being described. It is possible that on the GenII bikes the MAP sensor also acts as a BARO sensor. Ford used the strategy in the 1980's on EFI cars. When the ignition key is first turned on, the ECU uses the MAP sensor to take a barometric pressure reading (altitude) and adjust fuel delivery for the altitude that the engine is being started at.
Once the engine is started the MAP sensor functions as an electronic vacuum gauge and measures engine load. These early Ford EFI cars had a similar problem to what is being described on the FJR in that they would run fine until they were driven from a lower altitude to a higher one. The fuel system would run lean (hesitation/surging) until you shut the engine off and restarted it at altitude.

Well, your "guess" sure fits the symptoms. What did Ford do about it? :huh:

LC

Ford ****-caned the entire system, developed new EFI and started using a BARO sensor for altitude, same as GM and Chrysler.

 

[bmwhd]

Here is a complete guess at the problem being described. It is possible that on the GenII bikes the MAP sensor also acts as a BARO sensor. Ford used the strategy in the 1980's on EFI cars. When the ignition key is first turned on, the ECU uses the MAP sensor to take a barometric pressure reading (altitude) and adjust fuel delivery for the altitude that the engine is being started at.
Once the engine is started the MAP sensor functions as an electronic vacuum gauge and measures engine load. These early Ford EFI cars had a similar problem to what is being described on the FJR in that they would run fine until they were driven from a lower altitude to a higher one. The fuel system would run lean (hesitation/surging) until you shut the engine off and restarted it at altitude.

Well, your "guess" sure fits the symptoms. What did Ford do about it? :huh:

LC

Ford ****-caned the entire system, developed new EFI and started using a BARO sensor for altitude, same as GM and Chrysler.

But then why no (or only very few) '06s with this issue?

 

[nitelife]

I have an 06 with 20,000 miles on it and I have experienced this problem only twice and I do ALOT of mountain riding. No PCIII, only +7 mod.