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1G ACDelco MAP sensor??

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mitsuowner1991

10+ Year Contributor
304
7
Sep 29, 2009
West Keansburg, New_Jersey
When i bought my car years ago the guy gave me this sensor and im not sure what i would use it for .. Its GM Part #1222-3861.. Just curious what he would have used this for.. thanks
 

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It is an Manifold Absolute Pressure switch. Common on mid 80's GM stuff. I think they only will sense vacuum and not boost pressure but they are the same design as a Omni 3,4 or 5 Bar MAP sensor. It would be used to log vacuum/pressure in the intake manifold if you have a way to log it, say ECMLink or another tuning software that logs boost. I use the brackets off of them to mount my sensors, but have never used a GM to see if it logs any boost.
 
Its a good sensor for up to 28 lbs for logging, if it is a 3 bar sensor, as @Mello describes it. Nothing wrong with it.
 
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