90 crx si with jdm b16 swap and PR3 ecu. Car runs fine for about a few weeks no problems at all and then all of a sudden i'll leave to go to work in the morning, get about 5 minutes from my house and the car will bog, almost stall but doesn't but the engine light comes on and then the car runs like shat. The tach is anywhere from 500-1500rpm and moving really fast.

Code is 03 for MAP sensor. The last time it happened I checked all the voltages across the MAP sensor and it was within spec. Reset the ecu and it was fine. Today i reset the ecu twice and it was still happening. Any ideas? I've had this as an intermittent problem, but resetting the ecu has always cleared it.

 

i had the same code and problems yesterday man! i was told to check the timing. so i guess check out the timing? maybe thatll help

 

Vaccum hose is ok on the MAP? My brothers always slides off. Or is there a tear in the hose or a hole or something? Timing wont affect the MAP. It's a pressure sensor, so there has to be a reduction in pressure somewhere on the hose.

 

I'm thinking a vacuum leak somewhere, the car always bogs like a hickup before the 03 code is thrown.

Maybe a air in the coolant system? Could that cause it?.

Usually though i just shut the car off, reset the ecu to clear the code, turn it back on and drive away, but not today.

 

Specs were fine on the MAP, so it's gotta be losing pressure readings through a leak in the vaccum hose or something. It's reading the pressure in the intake manifold, so there's a loss somewhere for it to be throwing a code.