omni 3 bar reading negative with the engine off

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omni 3 bar reading negative with the engine off

Asics0413 Tue Aug 29, 2017 1:33 am

I would like to start by saying i am just getting familiar with neptune and i plan on taking my car to a tuner after i break in the engine. ok now that, that is out of the way i am trying to get my omni 3 bar map sensor working correctly. the car will start and run with a base tune i put together but with the engine off and key on neptune shows -.7 psi or - 963 mbar. even with the sensor pulled off of the tb it doesnt change. i already checked the wiring and the signal wire to the ecu shows a perfect connection with my multi meter but i am only getting 4.97 volts at the sensor? i tried all the stock map sensor setting and some different values i found online and i cant seem to dial it in. im not sure if i am missing something or the sensor is bad. if anyone can help it would be much appreciated.

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HRTuning Tue Aug 29, 2017 3:50 am

Either that's your atmospheric pressure reading or your sensor isn't reading correctly. Have you compared to the atmospheric pressure reading also available in the data list?

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Asics0413 Tue Aug 29, 2017 10:37 pm

Here's a screenshot of it. I'm not sure which in the data window is atmospheric. According to google my towns altitude is 909ft, if thats what your getting at. http://imgur.com/a/1oNeQ

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HRTuning Tue Aug 29, 2017 10:46 pm

PA says 987. You're 24mBar off, or so. 2.5%

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Asics0413 Tue Aug 29, 2017 11:02 pm

ok assuming google only shows the average altitude in my city, and i live on the higher end of that average, than my sensor is reading correctly. if not how should i handle this, buy a new one or adjust the values?

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HRTuning Wed Aug 30, 2017 2:59 pm

You're what, roughly 1000-1100 ft elevation? Seems fine if you don't mind 2.5% variance.

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