I fixed the ignition. Removed the tumbler, cleaned it and regressed it, works fine now.
Quote:
Originally Posted by nelbur
I just had my EGR apart recently. Many have said that fooling with the '97 EGR will bring on the check engine light due to the sensor on top of the valve. One poster provided filtered air instead of exhaust to the EGR, but that mod will flunk the inspection where I live because the emission stuff must appear unmodified. It appears to me that the sensor measures the opening of the valve and not the flow of exhaust gas. I believe one could block the flow using a plate in place of the gasket between the valve and the intake. I would also remove the butterfly plate from the flapper in the intake where the exhaust enters the intake. This should free up the breathing. If you try the above, let us know if your CEL stays off.
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I wired open the throttle plate ahead of the EGR valve (didn't touch the EGR valve itself) and within 5 miles it triggered the CEL with a P0400 code (low EGR flow). It must be measuring flow rate some how.
EDIT:
Looking at this:
http://bayhas.com/mercedes/w210/contents/engine606__enginecomb.htm
The engine has B28/3 (EGR valve) and B28 (pressure sensor). Since this is a naturally aspirated engine the pressure sensor must only measure vacuum caused by altitude or the pressure control valve (102) which I wired open, hence the CEL. I guess the trick would be to feed the pressure sensor a variable vacuum source that way it will think 102 is still functioning. Since the pressure control valve is disabled I could use the variable vaccum source that was running to 102 and instead send it to 28.
Tomorrow I'm going to drive it as is with the the pressure control valve wired open to see if it triggers the CEL again then I'll reset the cell and route a vacuum hose from the Y31/2 vacuum transducer to the pressure sensor and see if the CEL is triggered again. If I figure out how to defeat the vacuum control valve I'll move on to deleting the EGR.
The EGR valve is a lift sensor, can't measure flow.
http://bayhas.com/mercedes/w210/contents/images/techtrain/030bottom.gif
EDIT 2:
