Ok i managed to find instructions on a French website and have translated the instructions so apologies for the poor grammar.
Step 1: Remove the engine cover with the Lexus logo. Just lift it, it pops. Then, locate the EGR valve. It is located right above the intake manifold. There is a small sticker on the Red part of the electric valve.
Step 2: Locate a socket wrench 12 and unscrew the two nuts holding the bent aluminum tube on the valve. Free aluminum elbow by falling / twisting gently upwards. Take care not to lose the O-shaped diamond.
With this same key 12, unscrew the two screws holding the valve holder. Once the screws removed, lift the gray foam and pull the entire valve upward to remove it.
Once the valve exit, you end up with this:
Step 3: We will now work on the valve itself. Remove the electric part of the valve body of the valve. (3 allen screws to remove)
On the left, the electrical part (be careful to remove the black seal the metal part of the valve). Right, the metal part of the valve.
Step 4: Cleaning the metal part: With a small flat screwdriver, gently scrape the carbon deposits. Do this on both sides of the valve (input and output). Then make sure you have plastic gloves, a plastic container like Tupperware and acetone.
Use acetone to clean both sides of the valve. Alternate acetone bath and then clear water to rinse. You will see that the scale goes alone. Once clean, finish with a final acetone bath.
It is important not to end with a bath of clear water because the moisture does not favor at all the next startup ...
Step 5: Replace the gasket and tighten the electrical part of the valve on the metal body.
Step 6: Clean with a cloth soaked in acetone support the valve (side engine / exhaust). Also clean the aluminum inlet elbow in passing your finger. The dirt falls off by itself. (If you have time, you can try to remove the aluminum tube bent to make him also an acetone bath, but be careful not to lose the motor side nuts!)
Step 7: Replace the gasket on the rectangular base of the valve (exhaust manifold), replace the valve and screw it on its stand. Then replace the O-shaped diamond on the valve, twist the aluminum elbow to the valve and screw it onto the valve. Finally, replace the plastic cap stamped on the Lexus engine.
It is possible that by next start, the engine sputtered a bit during a few laps.
So there! Go take a look around and try it:-D
I must say that the most obvious, apart from a rise in more flexible and better recovery is the fact that there are no small holes that feeling of acceleration above 3000 rpm min.
Good weekend DIY
PS: It will still work better without it! (Equivalent to five months of fouling, and even then we do not see this as acetone dissolved ...)