The Exhaust Gas Recirculation (EGR) valve is a vacuum-controlled valve that allows a specific amount of your exhaust back into the intake manifold where it mixes with intake air to cool the combustion process. The exhaust your EGR valve recirculates also prevents the formation of nitrogen-related gases. An old or damaged EGR valve can get stuck, causing NOX gases to build up, leading to rough idle, poor acceleration and even a failed emissions test.
Parts you'll need:
- Repair Manual
- Basic Hand Tools
- Rags and Hand Cleaner
Safety comes first
Every vehicle is different. When it comes to maintenance and repairs, always follow the vehicle's owner's manual.
Safety should be your number one priority. Don't smoke, drink alcoholic beverages, or wear a necktie while working on the car. Watch out for hot objects, sharp instruments, hazardous materials and other potential safety hazards in and around your workspace.
Don't work with a Philips when the job calls for a flat. Substituting tools can compromise your safety or your vehicle's performance.
Finally, when the fun turns to frustration, or if the job requires specialized knowledge beyond your capabilities, please do not attempt it yourself. Talk to a professional mechanic or installer. The last thing we want is someone getting hurt.
Before you Begin:
It is important that you have a manual to locate the EGR as they are not always in the same place. When the EGR valve goes bad, it probably needs to be replaced. However, in some vehicles over ten years old, you may get away with just cleaning the valve with a mild solvent then replacing the gasket. Check with your manual.
IMPORTANT: Read your manual thoroughly before starting, as there maybe numerous lines and pipes that also need to be removed prior to working on your EGR valve.
Steps for checking and EGR valve:
- Place vehicle in park. Set the emergency brake.
- Start the vehicle and allow it to warm up to operating temperature
- Now, using your manual, locate the EGR valve.
- Next, find the EGR plunger mechanism. The plunger meters the exhaust gas recirculation by opening and closing.
- Manually rev the engine and check for plunger operation. A plunger stuck open or closed indicates EGR malfunction.
- Replace EGR as necessary.