I got myself an efi source 3 bar map sensor and tried using it yesterday. It's logging 15 psi at idle and when you push the throttle it goes down! My offsets are 305 and 10.33 which seems to be what everyone uses with this sensor. To I have to switch my 2 outside wires on the sensor?

 

The MAP sensor outputs in KPA not PSI there is math involved to convert from KPA to PSI which could be wrong in HP tuners.

Check the KPA value at idle and convert it to PSI on your own.

Also check for vacuum leaks.

 

Yeah my bad. Kpa is 105. And I have 12v in the middle connector.

Why am i getting 12v? Ideas? Thanks

 

If you are logging PSIA, it will show 14.7/15 PSI with KOEO.

OP,

Is this an aftermarket harness or factory?

 

china swap red blue harness with the EV1 connectors

 

Print out a wiring schematic and start chasing wires.

It's either wired incorrectly or the there is something wrong with PCM and it's not dropping the voltage on the 5v ref circuit.

 

You are the second person in a week that has had MAP sensor problems using a china harness. The other guy also had 12v at the MAP.