Quote:
Originally Posted by XfireZ51
Did you disconnect the BATT and clear the ECM? Do that and see if 31 comes back.
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Yes, I did and we tested three times, same scenario.
The cam sensor sure looks like the culprit. I scanned the interwebs and found them available from $180.00 (Rock Auto), to nearly $300.00 for a NOS Delco.
I'm not in the habit of buying $200 parts without knowing for sure whether that will fix the problem, so I decided to pester Marc H for a second opinion.
He ran through some possibilities, mostly electrical, saying that interference from a bad spark plug, or plug wires, or the worst, a problem with the CCU might be at fault. Although I had just put new plugs in (AC Delco) none of those other things seemed to be likely. Mostly because the wiring is in it's usual configuration and not up against, or tangled with the Cam Sensor lead that goes from under the drivers side cylinder head (between the middle two plugs), up to the CCU.
BTW, it's out in the open and looks quite easy to change. Grandma could do it.
Marc agreed that because of the repetitive nature of the problem, (runs great when cold, pops a code and goes to valet power when warmed up), the sensor is most likely to be bad.
A new one is on the way from Rock Auto, and I'll post how this shakes out.
But I'd also like to thank Mr. Haibeck to take time from his busy day to give me his opinion. I'm more than a thousand miles away, and not one of his customers, but he took the time to tell me what he thought. And as we all know, what he knows about the LT5 is pretty damn valuable to all of us.
Thanks, Marc.
