My NYer died at my second job on Saturday night. I pulled the codes and got 27 and 42. I thought it would be the PM, but it ended up being a problem with the LM. One of the first things I noticed when coming home was that it wouldn't cause the CEL to come on and stay on after I hit 2-3PSI. That was a constant problem with the last LM, and I frankly thought it had to have been a problem with the cal.

Knowing that others have had problems with their CEL not working at all, or sometimes in strange ways, I'm wondering if there is a possible fault with the board itself which is causing these problems? Perhaps some bad caps or diodes?

I'll be watching my CEL very closely as I go to work over the next few days. It would always show a little knock at about 10-11" of vac even though I've pulled about 4* of timing in that area.