Well after a week of delays or more,I got back to the 420,Though this time I could not get the car to light up,I unplugged the EHA,but it would not start,this has been areal challenge.I intend to pull the screen from the tank just to look!Maybe it is not getting full fuel flow?I don't know.Any one have more input?j-n-t

Well just another spot to up date our 420sel,After the smoke test and rebuilding of the intake system,we are now able to start the car on demand.check other sites of mine for pics of the air duct housing and the way the fuel linkage had to be adjusted to make it run,not cool.
Problem now is that we are in stall mode it runs fine then it will lose fuel and stall.you can slip it into neutral as it coast and restart,relights with out hesitation.looking in to the new situation,any words of wisdom?
Thanks just-n-time

How is your fuel pump relay? Try jumpering the terminals with a paperclip and drive around to see if the loss of fuel is remedied.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Have any Idea as to the terminals to be jumped,j-n-t

Ok, I will make that job #2 for tomorrow.
I worked on the idle today just trying to smooth it out,as I adjusted the linkage and tested the throttle position switch,(checked ok) I continued to look for vacuum leeks,tomorrow I will plug the main vacuum line to the break booster to see how that reacts on the Idle,I noticed that when I pushed down on the break peddle the boost gauge rose to about one quarter of the gauge and the Idle was even rougher,may have a leek in the power booster.
Idle control valve is in the pot being soaked and cleaned to see if that will make any difference, well enough for now. Thanks for all the input j-n-t

Continued on the inspection and trouble shooting of the 420 today,after cleaning the ICV,and reinstalling it,I found that the Idle was even more erratic than before.
The fuel pumps are holding well and not lousing power so we are OK at this point with the pumps and relay.
Resistance in the plug wires are of course to high,I found #5&#8 to stand at 0 ohms I suppose when they go they go just six months ago I checked all that and they read 3 ohms tried another meter just to be sure.
Well I will continue as the work progresses,by the way another ICV is on the way.

Well, it is time for the update of work, done to the 420sel. EHA was in need of being set and was done,then the duty cycle was set at Idle and 2500,this is at 60.2% the EHA is at -0.0 to + 0 to 0.01 threw 2500 to idle. The eng.runs well but for a start up roughness, then smooths out. the last peace of the puzzle is the potentiometer,it has failed all test given and one is on the way. all in all it has been ten months but well worth the time spent on a classic ride and those enjoyable trips. Other sights in my name will show a more details of the journey.jnt.

The new unit arrived and I took the ohm reading, It was 57.2, The old unit had a 94.7, I did not reset the new pot. to match the old, though I did get the pin two and one reading of .67. For giggles I am going to go back and reset the pot ohm to what the original was set at, just to see if I have any difference in the Idle.
The idle was some smother though not entirely what I expected, the low end search was better but not complete,I still have ever so slight of a waver when you lift from a snap rev. though it dose not stall as it would do at times, like when coming to a stop sign,or in slow traffic. The RPM is just at 550 to 600 in gear I was thinking 650 would have been better. I guess you get what you can?OR more like Another ICV. well let you all know of future developments.jnt