Yet another reason why the factory service manuals are wrong for these. You mentioned two in this thread which are the timing procedure and the full list of trouble codes. Then there's the countless incorrect wiring diagramsSo I was talking to Quadstar yesterday about a tune and he said the u1000 code is what you get when you disable Passlock in the PCM. He also said the security light should not light. So between the security light on mine being active and a boost code that would instantly reset he figured the PCM really did have issues. I'm going to get a tune from him , I never was impressed with the Heath tune. Didn't seem to do anything more than the stock tune. But I understand that the later oem tunes were a hotter tune.
Yep, it's hard to replicate the real world on the test bench. However, you can get the test fluid thin enough to start seeing if the head and rotor is loose enough to drop fuel rate at cranking RPM.Been told by a pump shop it's impossible to get them up to engine operating temp never mind the heat soak after shut down