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Old 10-28-2010, 08:56 AM
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The best way to test a MAP sensor is with a lab scope but even many shops doen't have one. If you have a scan tool that displays data, start by checking the baro reading with the engine off. It should be around 28-29 in. hg. unless you live at high altitude. Attach a vacuum gauge to a manifold source and start the engine. The vacuum gauge shoul read within 1" of what the sensor is showing in the scan tool display. Any big deviation from these numbers indicates a bad sensor. Also the sensor can still be bad and this test won't always catch it because the scan tool just can't display info or dropouts like a lab scope.
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