PeachParts Mercedes-Benz Forum - View Single Post

mdisav · #71 06-08-2006, 07:36 PM

Well, with all the debate on if the egr mod will work for the 606 turbo, I decided to try it. I am glad I did because it put things into perspective for me. I took off my intake and disconnected the egr tube and bent it aside. I put the intake back on and started it up.

There is quite a bit of exhaust pressure coming out of that tube even at idle. Giving it a bit of pedal and it really increases. I see now how it combats the boost pressure.

So I plugged up the tube and let the egr valve suck fresh air. I did not even get out of my cul de sac and the check engine light came on.

It made total sense to me. The sensors are use to sensing exhaust pressure entering the intake and fresh air does not even come close to mimicking it on the boost side of the intake. Plus I did hear the boost coming out the egr valve which I never heard before.

So Rick, you are definately right!

I had thought about routing crankcase gases in place of the exhaust gases but the pressure is no where near that of the exhaust pressure. So that is out.

If we are going to be sucessful at disabling the egr on the 606 turbo I believe we are going to have to do some type of condition mimicking to fool the sensors with the egr valve remaining closed.