Date registered: Dec 2012
Vehicle: 89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
Location: San Jose, California
Mentioned: 10 Post(s)
Quoted: 542 Post(s)
In that case, since your idle is shot, I would recommend starting to make some voltage measurements starting from the IACV.
As the car is idling see what the average voltage (in DC mode) is at the IACV connector with the car idling. Should be in the 4V-5V range.
If you do not have a voltmeter, as the car is idling, disconnect it. In an operational system the idle would shoot up to 1000-1100 RPM.
If you hot plug it during idling the engine would immediately stall.
See if you have this expected behavior.