It's a sensor that can measure pressures lower than ambient.
An ionization gauge pressure sensor measures the pressure of a gas by determining the number of gas ions present in a vacuum chamber. As gas pressure increases, more gas ions are formed through ionization, which the sensor can detect and convert into a pressure reading.
A vacuum gauge is used to measure the pressure in a vacuum. Application for car is at the MAP sensors. Most fuel injected cars uses MAP sensors to provide instantaneous manifold pressure information to the engine's electronic control unit (ECU). The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion. A fuel-injected engine may alternately use a mass airflow sensor (MAF sensor) to detect the intake airflow.
Examples of vacuums include the vacuum inside a sealed jar, the vacuum of outer space, and the vacuum inside a vacuum cleaner.
An engine may stumble during acceleration due to issues such as a clogged fuel filter, dirty fuel injectors, a vacuum leak, or a malfunctioning sensor (e.g., MAF sensor). These problems can disrupt the proper air-fuel ratio needed for smooth acceleration and performance.
The maximum vacuum pressure that can be achieved in this vacuum chamber is 10-6 torr.
sensor assy vacuum
ck for vacuum at map sensor hose, if it is vacuum present replace the map sensor.
Remove the vacuum hose from the sensor. Pull the sensor out of the air cleaner housing. Insert the new sensor into the air cleaner housing and attach the vacuum hose.
Yes, there is a diagram for the vacuum hose and sensor for this vehicle. It is found in the maintenance manual and in its repair manual.
On a 1994 Chevy Pickup 1500, the manifold absolute pressure (MAP) sensor is typically located on the intake manifold, near the throttle body. The vacuum line from the MAP sensor connects to a vacuum port on the intake manifold, which allows it to measure the manifold pressure accurately. Ensure the vacuum line is free of cracks or leaks for proper sensor functionality.
No vacuum to the MAP sensor on a 2004 Ford E350 6.0 could be caused by a vacuum leak in the intake manifold or associated hoses, which prevents the correct pressure from reaching the sensor. A clogged or faulty EGR valve could also restrict airflow, impacting the vacuum. Additionally, issues with the MAP sensor itself or its electrical connections might lead to a lack of signal or vacuum. Lastly, a malfunctioning engine or improper engine timing can contribute to inadequate vacuum levels.
that is the aircharge sensor
There isn't one you take the 2 screws out to remove the map sensor in which plugs directly into a hole in the intake manifold that's where it gets its vacuum from.
If it has vacuum lines attached to it, it is probably a thermoswitch that controls the vacuum to the egr valve. If it has an electrical connection it is probably a engine coolant temp sensor.
That is a MAP sensor code, check to see if the sensor is returning at least .5 volts, if not check for 5 volt reference voltage on the connector. If you have voltage going in, and none or less coming back out replace the sensor, if no reference voltage check the connectors, wiggle them and monitor the voltage. If the wiggle test checks out, draw a vacuum on the MAP sensor vacuum port. As you add vacuum the voltage should decrease. With no vacuum, the MAP sensor should read around 4.5 volts. If there is no change in MAP sensor reading on the scan tool, replace MAP sensor.
Remove the vacuum hose from the sensor. Remove the sensor retaining screws. The sensor will come off. Reverse the process to install the new sensor.
Idle speed is not adjustable. If the speed is incorrect you have a computer, sensor, actuator, vacuum leak issue.Idle speed is not adjustable. If the speed is incorrect you have a computer, sensor, actuator, vacuum leak issue.