How to Clean a Toyota EGR Valve

by Dan Ferrell
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Carbon build up inside your Toyota EGR valve affects engine performance, even increasing fuel consumption. After some years of service, you still can restore valve operation by removing and cleaning the obstructed passages inside the valve and the connecting exhaust manifold pipe to reestablish good engine operation. Follow these simple steps to remove, clean and reinstall the EGR valve in your Toyota. The procedure applies to vacuum type EGR valves.

Step 1

Park your Toyota in a safe place with enough room for you to work around the front of the vehicle.

Step 2

Open the hood and make sure the engine or engine components are cool enough to the touch to avoid skin burns or other injuries.

Step 3

Locate the EGR valve on the engine side, usually on the driver's side. Most valves resemble a metallic mushroom and are about 2 to 3 inches in diameter. Unplug the vacuum hose by hand from the top of the valve.

Step 4

Remove the pipe connecting to the bottom of the valve using a wrench or adjustable wrench. Remove the two valve mounting bolts using a wrench or ratchet and socket.

Step 5

Lift the valve away from the engine compartment and discard the EGR valve gasket. If necessary, use a plastic scraper to remove any gasket material remaining on the mating surfaces of the valve and engine.

Step 6

Clean the bottom of the valve and inlet orifice of carbon deposits using a wire brush and scratch awl or similar tool. Be careful not to score or damage the valve-mounting surface to avoid exhaust gas leaks. Tap the valve body to remove loose carbon deposits. If the EGR valve on your Toyota model can be disassembled, make sure to align the parts perfectly when reassembling. Clean the passage of the exhaust manifold pipe connecting to the valve as well.

Step 7

Set the cleaned valve in place on the engine using a new valve gasket and install the two mounting bolts by hand. Start the exhaust pipe nut into the valve by hand to avoid thread damage. Tighten the mounting bolts and pipe nut. Connect the vacuum hose to the top of the valve.

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