just wondering what the map sensor should be reading in mmhg at rest? with the ignition on and the motor not running. im reading -25mmhg and i dont think thats correct. ive been chasing down wiring issues for the last year and i think i may have another one here also. any help is appreciated.

 

This problem exists for every PFC since it came out in 1999.
The SCALE and OFFSET values for correct calibration of the map sensor are incorrect and it is all Greddy's fault. Yoy need a DATALOGIT to fix it.

Read the current thread about map sensor calibration that has been around for the last couple of days. https://www.rx7club.com/power-fc-forum-47/what-scale-offset-use-answer-here-maybe-610504/