How are EGR Vacuum Control Solenoid issues diagnosed?
Diagnosing a vacuum control solenoid is simple, and requires no tools. A technician with tools at their disposal will likely use a vacuum pump with a gauge and a multimeter to backprobe. Simply done, the solenoid can be disconnected electrically, vacuum can be pulled on the vacuum port, and the pins can be attached to a twelve volt power source. The solenoid should click when connected, and if the vacuum did not drop before connecting power, the vacuum gauge should jump to zero. This allows the technician to understand that the solenoid is moving both directions and the valve within the solenoid is holding vacuum and releasing when requested.
How are EGR Vacuum Control Solenoids replaced?
If the valve failed to hold or release vacuum or the solenoid failed to click on and off, replacement is necessary. To perform this repair, the solenoid would be separated from the vacuum lines first, then the electrical connection, and finally mounting hardware can be removed to release the EGR vacuum control solenoid from the vehicle. Replacement is as simple is removal, and the vacuum lines should be tested to ensure serviceability.
RepairPal Recommendations for EGR Vacuum Control Solenoid issues
Especially if the vacuum control solenoid tests operational, we recommend checking for vacuum and exhaust leaks when the EGR system is operating incorrectly. This is easy to do, quick, and may find the solution before any real diagnostic work must take place. A vacuum hose or loose fitting can cause many EGR issues.
What to look out for when dealing with EGR Vacuum Control Solenoid issues
The EGR system is nearly as hot as the exhaust system, especially if the engine has been running under heavy load or high engine speed. Wait at least thirty minutes to one hour before servicing the system, or just ensure the portion you are servicing is cool to the touch before proceeding. All systems do not use vacuum modulation for the EGR valve, and those will not have a vacuum control solenoid either.
Can I replace the EGR Vacuum Control Solenoid myself?
The EGR vacuum control solenoid is straightforward to diagnose and replace. As long as the EGR system and computerized automotive circuits are understood, this can be done by anyone with a multimeter and a little time to spare. Ensuring proper workplace safety is vital, especially when working with a hot system, and the DIY mechanic should understand the specific range of vacuum and voltage the vacuum control solenoid is meant to use.
