Yes, the engine can still run with the EGR vacuum solenoid not in the working condition.
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.
The EGR (Exhaust Gas Recirculation) valve opens when vacuum is applied. The EGR vacuum solenoid opens and closes the vacuum supply to the EGR valve when it is commanded to do so by the ECM (Engine Control Module).
EGR { Exhaust Gas Recirculation} Flow Malfunction Early Exhaust Gas Recirculation (EGR) systems components include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
on modern cars the fuel system is unvented. The evap purge and vent solenoid goes to a charcoal canister. When the vehicle is off the fuel tank is connected to the charcoal canister through the P/V solenoid and it absorbs the vented gas fumes from the tank. When the vehicle is on and at speed the solenoid switches and the charcoal canister is connected to engine vacuum and the vacuum of the engine purges the gas fumes in the charcoal through the engine burning them
Check for vacuum leaks and good electrical connection at the EVAP vent solenoid
For the engine, under the plastic engine cover (sight shield). For the a/c, under the right side of the dash.
On the intake manifold on the left side of the engine. It looks like a rectangular box with vacuum hoses and electrical.
egr solenoid is the most common problem. The EGR Solenoid has a vacuum hose at the top running from the EGR Valve and one vacuum hose that connects to the upper intake manifold. The solenoid is brown in color. Try replacing all of the vacuum hoses before anything first for only 3.00 this could fix your problem as well. (you have a vacuum diagram on your hood)
The exhaust is plugged, most likely a failed catalytic converter.
no
The EGR on a 2007 is not vacuum controlled.
No, it is electric