Chrysler Repair: 88 new yorker fuel injection V 6, coolant temp, engine coolant

Question
this is what i have found.IF I SPRAY GAS INTO THE INTAKE THE CAR RUNS. ONLY CODE 55 COMES UP.IF I DISCONECT THE FUEL LINE THERE IS GAS COMMING OUT WHILE TRYING TO CRANK.BEFORE THE CAR DIED IT WOULD SHUT DOWN EVERY NOW AND THEN WHILE DRIVING BUT IF I GAVE IT FULL THROTTLE IT WOULD GO. THIS LAST TIME IT JUST DIED AND NOT START.FUEL SEEMS TO BE THE PROBLEM

Answer
Hi Fitz,
No start with no codes is always a challenge. Focusing on the fuel side of the equation, I would suggest that you get a reading of the pressure in the fuel rail when you are cranking it. You have to open the connection between the fuel supply hose and the fuel rail and insert a gauge at that point, reconnecting the connection so that the regulator is still in the circuit. It should read 48 psi +/-2.
The sensors that affect the mixture are the MAP sensor and the engine coolant temp sensor. The former is mounted on the generator mounting bracket. It could be inaccurate without setting a fault code. Check the voltage on the dark green/red wire with the ignition turned 'on' which should be about 4.6V unless you live at a high altitude. The try cranking the engine to see if the voltage drops to around 3V.
The coolant temp sensor is located next to  the thermostat housing and has a two wire plug. Remove the plug and see if the resistance is the the range of 7000 to 13000 ohms.
Finally if you have a vehicle that was delivered originally in California and then you would have an egr valve, and that could be stuck ajar which also has the effect of leaning out the mixture so it won't start or idle. Let me know if that is the case and I'll tell you how check that out.
Those are main possibilities if the mixture is the issue.
Roland