I have a 1996 miata with the 1996 to 1997 mspnp2. I have noticed for the past to days that my idle map pressure has been getting lower and lower everyday. At first it would idle at 30kpa but over the past to days its now 22kpa. My idle is hunting for 13.5 afr and the map sits at 25 to 22kpa. Also my barometer sit at 101.3 kpa with the car off and the map sits at 92kpa also with the car off. With diyautotunes base map the map sensor is MPXH6400 and the barometer is MPX4115. Could it be that I have a calibration issue or maybe a pinched vacuum line? With the map line disconnected from the engine and megasquirt I could blow through the map line and air passes through with little to no resistance.

 

You should not be able to easily blow into the map sensor. Open case, fix tubing inside.

 

I was not blowing into the map sensor. Just the vacuum line that runs from the engine to the ms and I disconnected it at both ends so it was not connected to the ms map port. the map is rock solid and holds pressure.

 

This isn’t related to your question at all, but i installed a GM 3 Bar map sensor on my MSPNP2 but wit key on engine off, my KPA reads 285 when it should read 95-100 KPA. Not sure what the problem could be. The ecu company told me the map sensor might be faulty so they sent me a new one, but switching It changed nothing. Any ideas on what the issue could be?

 

If im right the megasquirt pnp 2 comes with a 4 bar map sensor. But if you have the 3 bar sensor try this! Go to map/baro calibration under tools in the top left corner on the screen. The map sensor I have is under MPXH6400 which is the 4 bar map daddy sensor. If you have a GM 3 bar try setting it under GM 3-BAR/MPXH3600 and the baro to MPX4115. Also if you installed the sensor internally where the old one was on the board make sure the map selector is on internal instead of external.

 

Its an external map sensor and I did what you said, but nothing changed. My KPA still reads 285, I switched the jumper to read external map sensor too. Not sure what the issue is tbh, anymore ideas?