Out of Limit
Hmm a website I just now read actually says “Some models say “OL” (Open-Loop)“.
In any case, that’s what I got on two plugs.
I wonder what the number of bad plugs it takes to really cause this level of a problem.
The voltage reading on my plug in meter only drops to about 11.2v now, with the plugs manuy turned on. It initially drops to 10.x but goes back up. I know it used to read 9.x with the glow plugs on back in February, so I guess half or more went bad. Sheesh.