my dad's glow light stopped functioning a few weeks ago on the 83.....it puts out more blue-white on startup and lops from side to side unless you rev it a little (probably to get some heat in the cylinders that didn't glow) But once its running it runs normally/fine. I tested the plugs with my ohm meter today and it looks like 2-3 of them are out of spec Amazingly it has had no problem starting even when we went up north a few weeks ago (the light was out then too)....a good MINUTE of cranking and it was running Now that its warmer from a cold start it will cough and do the blue thing, but starts on the 2nd to 3rd crank, amazingly. We ordered a set of new plugs, the ones in there look reeeal old.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)