If the service engine light keeps coming on and the code reads?æevap?æ?ævacuum that means the part needs to be replaced. A auto shop can help take care of the repairs.
Likely a vacuum leak. Check all vacuum hoses including those running under cover on top of engine.
The 2003 Mondeo does not have a IAT Sensor is has a Temperature and Manifold Absolute Pressure Sensor (TMAP) The TMAP sensor fits directly into the inlet manifold and accurately measures the vacuum from the engine. The TMAP sensor consists of a temperature sensor and a pressure transducer and therefore replaces the IAT and the MAP sensors. The TMAP sensor provides the powertrain control module with information relating to inlet manifold vacuum and barometric pressure along with the temperature of the air in the inlet manifold. With the ignition on but without the engine running the sensor reads barometric pressure and when the engine is running, the sensor reads inlet manifold vacuum.
The vacuum's name is VAQ-M.
It is used in the control logic and for representing controlled data. Basically a transistor has two inputs where one of the inputs decides whether or not to output the other. Imagine you have a vacuum cleaner. If the vacuum cleaner is on then the following two conditions are met: 1. The cable is connected to the wall. 2. You have the switch in on position. These two conditions represent the two inputs in the transistor (both being "on" if you can hear your vacuum cleaner). The output is represented by whether or not the vacuum cleaner is on. The switch decides whether or not to let whatever electrical signal you may have through to the vacuum cleaners engine. If switch is on then it outputs the signal from the cable. If the cable is not connected there will still be an output but it will be an "off". Sorry about the potentially confusing analogy.
I am not sure if they are proportional, but they are inversely related. High pressure makes a low vacuum, and low pressure makes a high vacuum.
You can find a diagram for the vacuum system in a 1995 Blazer 4x4 will be located in the Blazer service manual. The manual can be purchased in most auto parts.
Check for vacuum leaks.
The engine's vacuum is mostly controlled by the cam. You can use a milder cam to increase vacuum, or purchase an inexpensive vacuum reservoir to make better use of the vacuum you have.
The 2001 Chevy Blazer vacuum switch solenoid can be found on the firewall in the engine compartment. The vacuum switch solenoid will be on the passenger side of the firewall.
check your owner's manual Check for vacuum leaks (replace all vacuum hoses anyway, they are cheap) but also remove and clean the EGR valve.
on the top of the transmission its on the transfer case with 3 vacuum lines coming out of it.
I need a diagram for the 1991 Chevy blazer to see where the 3 hoses go to coming off the transfer case.
Check for vacuum leak
The air door under the Blazers dash could be stuck, or there could be a vacuum leak on the engine. The door opens and closes from vacuum, directing the air from heat to defrost.
The vents are opened and closed by vacuum. There should be a vacuum line running from the engine to the inside of the Trailblazer. That line is broken somewhere and it is not sending vacuum to the switch. That will cause it to blow to the top of the dash (defroster) and to the bottom (floor.) Find that line trace it back and splice a new line in where it is broken. That should fix the problem.
where dose the vacuum under the battery come from
Try looking in Mitchel's OnDemand5 program under Engine Performance/Vacuum diagrams for this vehicle, Hope this'll help.