IS there a diff in Baro sensor, Map sensor?
02-22-2004, 12:09 PM
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Car: '01-Z71, 2ND GEN CAMARO, 3RD GEN Z28
Engine: 5.3, 383 STROKER, 350 TPI
Transmission: 4L80E, TH400, 700R4
IS there a diff in Baro sensor, Map sensor?
Was wondering if Baro and map sensor are the same. My Haynes manual refers to the Map, Baro, and the vacuum sensor. Are all of these different? I found the map sensor, bolted to the edge of the plenum. Where is the Baro sensor and vacuum sensor? Its on a 91 350 TPI Car. Thanks
02-22-2004, 08:51 PM
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According to an old AC Delco writeup the MAP, manifold absolute pressure, sensor measures barometric pressure/differential. Manifold absolute pressure is the reverse of manifold vacuum, MAP is low when vacuum is high. Engine not running manifold is at atm. pressure and the MAP sensor reads baro. press. So the sensor sees the difference between ambient barometric pressure and the manifold vacuum and gives the ECM a reading it can use.
02-22-2004, 09:09 PM
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Car: '01-Z71, 2ND GEN CAMARO, 3RD GEN Z28
Engine: 5.3, 383 STROKER, 350 TPI
Transmission: 4L80E, TH400, 700R4
So which one would effect idle, I've unplugged the map sensor and it didn't seem to act any different. Thanks
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