Manifold Pressure Sensor Accuracy

[jpharrell]

Altimeter setting at the airport yesterday was 29.80 and the field altitude is about 500 feet. Based on this I would expect the manifold pressure sensor to read 29.3 but it actually reported 29.9 with the engine off. Is this within the expected accuracy of the MAP sensor?

 

[dynonsupport]

Apologies for the delay in responding. In the situation you describe, the two pressures should match or be close to each other. You're correct that the difference you're seeing is too much. Suggest you email Dynon Technical Support - support@dynonavionics.com and we can help troubleshoot and fix the issue.

When you email us, please put this in the subject line:
Case 172949

Altimeter setting at the airport yesterday was 29.80 and the field altitude is about 500 feet. Based on this I would expect the manifold pressure sensor to read 29.3 but it actually reported 29.9 with the engine off. Is this within the expected accuracy of the MAP sensor?