Quote:
Originally Posted by J-B Racing
OK
Here is what's going on.
Green Wire from car Harness is 4.90 Volts ( MAP Wires )
Green Wire from Alky is .004 Volts
These are measured with the Alky Green unplugged from Green of car.
Does that tell you anything??
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+2.. your MAP sensor has three wires. Gray, green, and black.
Gray is +5
Green is signal
Black is ground.
If you lose/bad connection on the black.. you will see +5(in your case 4.9) on the green wire.
Jump a ground to the black wire on the 3 bar.. bet your problem goes away. And connections to the MAP sensor are CRITICAL. So dont do questionable connections
HTH