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Most air mass flow sensors are simple potentiometers. If there are three connections, it is easy to determine what the voltage range will be. Measure the two outside terminals of the pot (not the wiper) and that is the reference voltage voltage number you are looking for. The reference voltage will not change as the sensor changes, only the voltage at the wiper will change.
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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