Q:

what should be the voltage of the wires going to the MAP sensor on the PLUG side?

what should be the voltage of the MAP wires leading into the ECU?
D17 & D19 slot
http://technet.ff-squad.com/wiring.obd1.htm

 

Im pretty sure its a 5v referance I cant remember off hand.

 

pin 19 should be 5v
pin 17 is the signal

 

with the key ignII, should both d17 & d19 read 5v?

 

they are voltage dividers. The ref to ground is 5v. The signal to ground voltage is variable, depending on absolute pressure. If the sensor is unhooked, there should be no reading on the signal wire. Voltage of ref to sig + sig to ground = refV.

 

i just decided to run the 3 wires from map sensor to the ECU....
i figured there must of been a short somewhere.

NO more code 3 BUT car does have slight backfire at idel.... just not when you rev it.
Still running rich.

I'm going to try new ecu