Mechanics

EGR Valve Replacement

How to Replace an EGR Valve

The EGR or exhaust gas recirculation valve is used to control the knox (no2) gasses in your engine. These gasses are produced by high combustion chamber temperatures and can be lethal if not controlled. Also with these high combustion temperatures the engine will produce a ping or knocking sound, which is causing damage to your car's engine. The EGR valve allows exhaust gasses to enter the intake manifold, in turn lowering the intensity of the combustion event. This valve is actuated by either vacuum or electronically controlled solenoids. 

The systems effectiveness is monitored by the oxygen sensors or EGR position sensor. When the EGR valve fails it can cause a service engine soon or check engine light to illuminate. Most EGR valves are located on or near the intake manifold of the engine.

Place your car on level ground with the emergency brake set and in park. You will be dealing with grease so please wear protective eyewear, gloves and clothing.


Supplies and Tools Needed to Complete this Job

1. Replacement EGR valve

2. Shop towels

3. Wrench set

4. Ratchet with socket set

5. Gasket scrapper

6. Screwdriver set
 

Instructions

Step 1 - Activate the hood release of your car, next locate and undo the secondary release and raise the hood. If needed install prop rod to support the hood for safety.

Step 2 - Remove intake manifold cover if equipped.

Step 3 - Locate EGR valve on or near the intake manifold. (If you cannot find the EGR valve consult a car repair manual).

Step 4 - Remove the electrical and/or vacuum line from the valve

Step 5 - Gently pry on the valve to "pop" it loose and remove the valve.

Step 6 - Carefully remove and clean the gasket surface, Use paper or equivalent to block port to help stop debris from entering the intake and exhaust ports.

Step 7 - Match the replacement valve to the new EGR valve. (Note: some egr valves will be updated and not look exactly the same).

Step 8 - Install the new gasket with the replacement valve.

Step 9 - Reconnect the wiring and/or vacuum line.

Step 10 - Clear any activated trouble codes.

(Note: If a trouble code is present and the EGR valve was replaced and the codes cleared and you are unsure the valve could be the problem, it will take about a half an hour of driving before the system has reset. If the check engine light stays out the problem is fixed).


Best Practices

  • Always inspect the vacuum line that feeds the valve. Heat can make this line brittle causing a crack or break allowing a vacuum leak. This condition will hinder the operation of the valve.
  • Replace the sealing gasket between the valve and intake manifold. If this gasket fails it can cause a vacuum or exhaust system leak.
  • Use WD40 or equivalent to help loosen rusty mounting bolts/nuts.
  • Use OEM replacement parts
If further assistance is needed, our certified car repair technicians are ready to answer your car questions. Also, gain manufacturer specific instructions and information by clicking - Auto Repair Manual

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AUTHOR


Written by
Co-Founder and CEO of 2CarPros.com
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2013-08-16)