map sensor makes engine stop running

[caspersmiths]

When the vacuum line is plugged in to the MAP sensor the engine won't run but when I disconnect the vacuum line from the MAP sensor the engine idles great and has no power to run.

[TerryAuto]

Sounds like a bad sensor.
They can go bad and give incorrect reading, but not set a code.

[reidbunch8]

2002 suburban getting P0300 code and periodic P0174 code pulled plug wires from driver side cylinders and had no change in the running of the engine. all new plugs, wires, MAF sensor, knock sensors, intake gaskets, fuel filter, and swapped the injectors with the opposite side and same outcome

[Samjam]

Are you syaing thatg you removed all plugs wires from drivers side, staterted tryck, and it does not run any different?
Do they have spark?
What engine?

[Alby]

Sorry to post this as a reply to an unrelated topic, but the site won't let me start a new topic.
P0446 code comes back on . Bench tested tank vent valve solenoid, intake valve solenoid, gas cap looks fine and removed and checked charcoal vapor box. All hoses are clear and I have 12v at connectors when key is on. Any ideas

[carriedi]

three things need to be checked for working condition along with all the hoses and connections.. Purge valve, vent valve and tank pressure sensor. You will need to see if both valves open and close with the correct current to them. And that means that you energize the circuit and the solenoid clicks and that you check to see if they actually close all the way. You should use a hand vacuum pump with a gauge to see if the valves are closing all the way and sealing. You will need a scanner to see what the fuel tank pressure sensor reads and how it senses small increases of pressure and vacuum to the tank. An automotive smoke machine would help you for finding leaks in the system that could make the pressure gauge have a wrong reading.