A1: No history of issues with Starter - truck started fine every time with old motor - no hesitation. Reinstalled same starter with new motor assuming it would be fine. Starter looks pretty worn, but when taken out, it operated as expected.
A2: The only behavior change since the beginning are 2 things: 1) Upon initial startup process, I could get the motor to crank without ignition. When adding ignition, it did the "ping, dead" thing. The first time this happened, I was able to unplug the ignition and get the motor to crank again, but after plugging the ignition in and trying a second time (getting the same results as the first) I could no longer get the motor to crank even without ignition plugged in. From that point on, no matter ignition or none, the motor will not crank. The only result I get is "Ping, Dead". 2) As of today, the power is not coming back on at all - or at least within the hour that I had at home before leaving. Where it would previously return within 5 minutes, it has not yet returned. Battery terminals and Fuse Bus terminals still read as before - right around 12v. I have not checked AC or Radio or headlights - I just noticed there were no dash lights or sounds... which is a new situation. I can and will doublecheck all of these things (including Ohmmeter check) when I get home again later this afternoon.
Either way, I feel like I need to get a good inspection of the starter - or even just replace it for precautionary purposes...
DHud,
No doubt you are aware that we are dealing with something out of the ordinary. Doesn't mean that
it can't be fixed, but it does mean that we are going to have to assume everything is bad, and go
through the effort of proving to ourselves that each piece of the powerplant puzzle is good.
But before I lose an observation in the following, I find it interesting that you were able to crank the
motor over with the Ignition disconnected. But after reconnecting the Ignition we're having the
Ping no crank symptom?
Q: Did you use the CKP sensor from the original engine, or did you use the one that was already
installed in the replacement motor? The reason I ask is that GM had a TSB where a malfunctioning CKP
sensor would add up to 50° of timing advance during cranking, and this would cause the motor to kick
back so hard that it would actually damage parts? (Please read the attached TSB for details.)
As for the 'no crank at all', you are saying that you get an audible "Ping, then dead"? Not complete silence, as
in zero power? Be sure to check that 40A Ign A fuse, for it may have blown in all the excitement?
****
If possible, (assuming the 40A IGN A fuse is good) I'd like you to once again disconnect the Ignition
and see if we can't get the engine spinning over? If it will, do NOT reconnect the ignition yet until
we can figure out what might be going on with the CKP sensor? (My theory is that the replacement
motor might have a malfunctioning CKP sensor that's described in the attached TSB, for this would
explain the sudden mysterious cranking behavior coincident with the engine swap?)
****
I know, this all sounds like wild stuff, but this seems to be an unusual post engine-swap behavior,
and it's best to include all possibilities after all the more probable solutions have been tried.
For what it's worth --
Attachments
Last edited: