Diesel911: Don't you hate it when the car mysteriously heals itself without any action on your part? I'll definitely check the connection on the temp sensor.

I understand the wife thing: After convincing mine to wait for the glow plug light to go out; now she has to count to ten before firing it up. Her response: "Is this car safe to drive? Am I going to get stuck somewhere?"

Mxfrank: Thanks for the error codes. I'll need to determine if the codes for the 606 engines are the same, but the second code you offered seems to fit. Is it possible to test the pre-glow time relay, short of swapping out with a known good one.?

dtf: Yes, the dreaded biodegradable wiring insulation. My engine harness had deteriorated to such an extent I had no choice but to replace it and eventually tracked down a new, upgraded harness about a year or so ago, resolving that issue.