|
The relay has some minor intelligence and it senses resistance and current draw if I remember correctly in each plug among other things. During acceleration, the plug will heat up from the energy of combustion and increase the resistance measurement. The sensing circuitry may be returning a "false positive"of plug condition or actually detecting a fault in one of the plugs.
One other thing first, You mentioned you checked voltage to each plug with a DVM--check resistance, cold they should be in.4~.5 ohms, warm .6~.7 ohms.
Pull the larger 6 pin plug from the top of the relay and ohm out each plug--takes ten minutes.
The light on after start is a "check glow plug integrity" light so to speak.
I've included the condensed versions of chapter 15 from the 602-603 shop manual. The last page talks about fault detections.
Ensure you plugs are 100%, and if they are it's the relay.
__________________
Mark
========
THE WHITE FLEET
2016 GLE300d 4-MATIC 38K BROWN!
2012 S350 Bluetec==94k WHITE
2007 ML320 CDI==166K WHITE (FOR SALE)
Under new management:
2005 E320 CDI--140K--WHITE
1995 E300-Diesel-133.5K--THE CAR IS BLUE
1986 300SL--97.5K (European) AND WHITE. Back in Europe!
1991 190E 2.3-73K California Perfect.--WHITE
1995 E320-Wagon-159K--WHITE (recently scrapped)
1987 300D Turbo-213K--WHITE
1987 190D 2.5 Turbo-288K--WHITE
|