if the pressure is greater than 29.4 kPa and you replaced the switch...it could be a fugged up wire, a messed up ground, or malfunctioning ECU.

 

btw...is this on a B18B1 or C1?

 

yea well see i also have a prob with the check engine light coming on sometimes and the S3 light blinking on the dash (its an auto) and when it does that it will not crank for anything, it will turn over but not start. i was at an advanced auto a few days ago and it was doing it in the parking lot and the guys in the store said they did not have the tools to pull the code off of an acura, they didnt even know where the hook up would be at. i thought it was weird though. so yea it could be a ecu problem. its still in the shop and i told them to find out why it doesnt want to start and find out why the light is blinking, its being done on an IOU so i told them to replace what ever it took.