How to Replace an EGR Valve
or exhaust gas recirculation
valve is used to control the knox (no2) gasses in your
. 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
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
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
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).
- 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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Article first published 2009-07-28 (Updated 2015-01-07)