Thanks for the kind words.

I don't think that the mixture or the EHA has much to do with the idle problem. Why are you chasing this area?

As far as I can tell, there is no idle control unit, your car's idle is controlled by one of the control units. An unlike most KE Jet engines, it doesn't seem to have an idle air valve. So you need to find the mechanism by which the idle is controlled. Then, identify the inputs to the control unit that influence idle speed and verify that they are correct. Some likely culprits are engine temp, gearshift position, AC on/off. What signal is used to determine engine RPM?

If its like the 400E I have been messing with lately, there is an idle speed and cruise control module that varies the position of the throttle plate at idle. There is actually an electric motor that moves the plate.

I suggest that you get either the Startek or Alldatadiy subscription for your car - it will help you a lot with troubleshooting.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe