What to know about the EVP Shut Off Solenoid:
Your vehicle is furnished with an emissions-related system known as the exhaust gas recirculation, or EGR. Its function is to reintroduce exhaust with unburned fuel back into the engine to complete its combustion. The system is regulated by a valve that determines when to permit exhaust gases back into the intake air and how much to recirculate. This EGR valve has a position sensor that determines what position the gate is in to allow exhaust gases into the intake. This EGR valve position sensor (EVP) has a solenoid that closes the gate to stop any exhaust gases from entering the intake. This shut off solenoid closes the gate during engine warm-up in particular so the engine can reach operating temperature easily and optimally on fresh air alone.
If the EVP shut off solenoid doesn’t close fully, the engine can experience difficulty starting or may run rough on a cold start. If the EVP solenoid doesn’t open when the engine reaches running temperature, the emissions system will not run efficiently and excessive hydrocarbons will be introduced into the atmosphere.
Facts to Note:
The EGR system is part of your vehicle’s emissions control system and needs to be functioning in most areas for smog tests.
Exhaust systems are extremely hot and should not be touched until they have completely cooled.
How to Fix:
The EVP shut off solenoid is confirmed it requires to be replaced
The faulty EVP solenoid is removed
The new EVP shut off solenoid is fixed
The engine is scanned for codes
The vehicle is road tested for proper operation and no check engine light comes on
The EVP shut off solenoid does not need regular upkeep or servicing. If your engine light comes on or you experience an engine knock, it may be related to the EVP solenoid. Have one of your expert mechanics analyze the concern and change the EVP shut off solenoid if need be.
Common symptoms indicating you may need to change the EVP Shut Off Solenoid:
Engine knocks while accelerating
Check Engine light is on
Importance of this service:
If you are experiencing engine performance issues related to your EVP solenoid, have it changed before additional engine damage happens, such as burnt valves. Alternately, change a defective EVP shut off solenoid before a smog test.