I just received a tuned pcm back from Solomon for my 97 lt1 formula. I made sure the battery was disconnected before hooking up and it started okay but ran kinda shitty. I blamed it on the half mixture of 87 and 93 octane. Drove it to work and back until the 87 was completely out and filled 10 gallons with 93. No knocks showing, no retarding shown and still kinda ran crappy for a 224/230 cam (almost no difference between stock).
I replaced an o2 that seemed a little out of wack and started reading properly figuring that was the issue for the rough idle and poor performance.
A few days later it wouldn't start, just kept cranking and cranking. Somehow I push started it and it was still running kinda poor. I was stopped in construction on the way to work and it stalled on me three times at idle (10 minutes of sitting there). Everytime it started right back up without hesitation. After 30 more minutes of highway driving to work, I parked it and went inside. 5 hrs later, just cranking. (could smell fuel) I had my brother come out to check the spark and there was none.
I tried replacing the Crank position sensor figuring that may be the issue. Nope did not help and the computer showed both reading 160 when cranking. 0-5 when obviously not cranking. So I ruled that out.
Had it towed to the local shop where it sits now. The wires from the Crank position sensor wires showed good ground and everything else. Tested all the wires from the pcm connectors (not connected) to distributor harness and the ICM. So i ruled out any broken wires. Everything checked out fine compared to 4th Gen LT1 F-body Tech Articles
except one thing.
When the key is off, the opti harness reference low shows a good ground. But when the key is on, reference low is showing 70-100ohms where Shoebox came up with D = ~0 - 0.2 ohms ground. Is this a proper reading I am getting with the computer and key turned on?
One other question I am kinda stumped on. The Ignition Control wire from the PCM (white) that connects to the ICM; is that a positive?? I believe that is the one that is supposed to pulse from the PCM when cranking.
I do not want to say it was an issue with the tune since I believe in Solomons ability but I do not know what it may be.
If additional information is needed, I can provide it. Just didn't want to overload more information that necessary. I miss my formula