The EGR valve reintroduces exhaust gas into the engine. It serves two purposes -- less exhaust gas is vented to the atmosphere, and it cools the engine, making it more efficient. The EGR valve often "carbons up." Exhaust residue sticks to the inside of the valve and keeps it from opening and closing properly. If the valve doesn't work properly, the vehicle will run poorly and may even stall when you come to a stop.
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Things you need
- Set of sockets
- Set of line wrenches
- Carburettor cleaner
- Code scanner
Remove the exhaust valve from the vehicle. On most vehicles, it is located on the back of the intake manifold. Remove the metal pipe on the valve, if your engine is so-equipped, using the line wrench.
Remove the vacuum line from the valve, using the screwdriver. Unbolt the valve from the intake manifold.
Spray carburettor cleaner into the valve's orifice to rinse out the carbon. If the carbon is heavily built up, you may not be able to remove enough to clean the valve, in which case, you need to purchase a new valve.
Dry the valve out with a shop rag, then reinstall the valve. If the engine light is on, clear the codes with the code scanner by plugging it into the data link port and pressing the "Erase" button on the scanner.