1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,302 Posts
Welcome to Allpar. Stalling at stops, but OK while driving down the road?
The stalling may have caused the MAP fault code (and not the other way around) when the vacuum dropped to 0 at the point of stall. The old MAP sensor itself may be OK.
I would be very concerned about what is inside the fuel tank if the filter was plugged solid. You may have been trying to blow through the fuel pressure regulator which you probably can't do. You want to address this first, if there is a problem. Remove the fuel pump assembly with a low tank of gas and get a fuel sample from the bottom of the tank or examine the bottom of the fuel pump reservoir for debris.
It may take awhile for P0401 to reappear. The EGR transducer and valve may be leaking exhaust into the intake manifold. Too much EGR at idle can cause a roughness/stall. For diagnosis, try temporarily removing and plugging the vacuum hose to the black round plastic transducer to see if the stalling goes away.
The TPS can act up without setting a fault code. Monitor the signal to the PCM. This can be watched inside the vehicle with an OBD II scan tool/good code reader or long wires to inside the vehicle to a DC voltmeter. At idle, the TPS signal should sit 'rock steady' at it's base idle voltage which should be around 0.67 volts. If it varies up and down without touching the gas, check the connections and harness and if nothing is found, replace the TPS.
The stalling may have caused the MAP fault code (and not the other way around) when the vacuum dropped to 0 at the point of stall. The old MAP sensor itself may be OK.
I would be very concerned about what is inside the fuel tank if the filter was plugged solid. You may have been trying to blow through the fuel pressure regulator which you probably can't do. You want to address this first, if there is a problem. Remove the fuel pump assembly with a low tank of gas and get a fuel sample from the bottom of the tank or examine the bottom of the fuel pump reservoir for debris.
It may take awhile for P0401 to reappear. The EGR transducer and valve may be leaking exhaust into the intake manifold. Too much EGR at idle can cause a roughness/stall. For diagnosis, try temporarily removing and plugging the vacuum hose to the black round plastic transducer to see if the stalling goes away.
The TPS can act up without setting a fault code. Monitor the signal to the PCM. This can be watched inside the vehicle with an OBD II scan tool/good code reader or long wires to inside the vehicle to a DC voltmeter. At idle, the TPS signal should sit 'rock steady' at it's base idle voltage which should be around 0.67 volts. If it varies up and down without touching the gas, check the connections and harness and if nothing is found, replace the TPS.
