Hi guys, i really have a hard time trying to fix my map sensor problem. I'm using Neptune RTP/P28

I used a " No name " 3bar map from ebay ( factory style )
Like this one
http://www.ebay.com/itm/Turbo-3-Bar-Map-Sensor-HONDA-ACURA-CIVIC-INTEGRA-ACCORD-CRX-29-LB-Boost-/321382193924?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3AHonda%7CYear%3A2003&hash=item4ad3df1b04&vxp=mtr
I have 1.84v from map to ecu with this sensor. Using the omnipower setting and im at 1.8psi with key ON, engine off. I ran the car a few ride before i saw this problem.

I tryed other 3bar setting and im not able to find the correct one. I did find my own with the datasheet of the sensor but its even worse, car do not start..

So now i bought a 2.5 motorola mpx4250ap to test ( really cheap on digi-key + 2 day shipping ). Got 1.80v from map to ecu and still have problem with it.. i know they are cheap.. can i had a broken one lol? Wiring is good.. Car do not start or its way to rich to keep its idle. ( Scalar: 511 Offset: -255 ) did the math with this http://www.hondata.com/help/kmanager...randoffset.htm

So i really need some input. Did i got two bad sensor? Or is it the wrong setting? Thank you for your time

 

Most likely a grounding issue...

Where is your main ECU ground located? Usually on the thermostate housing...take that off and check the wires. clean any corrosion and said the contact point on the housing with some sand paper to clean it up. Re-attach the ECU ground and make certain the engine is properly grounded to the chassis and that the battery grounds are all clean and proper.

 

try a stock map sensor just to rule out other problems first.