I had a guy come over with his HPTuners for 98 Model LS1 cars, my car has a 98 LS1/M6. He first tried flashing it with a stock 98/M6 tune that had some codes removed as well as a slight change in timing, the car wouldnt start, it would turn over, but no start. So we tried to flash it to a totally stock setting and would not start or run either. We went back to the tune that was in the PCM and it starts rite up and runs just as it has been. Why would a car not run on the stock tune? It took the tune nice and normally with no issues but would not start. From looking at the tables, the ECT or Im guessing where the air flow tables for the current tune were pulling alot more air than stock, I think stock was something like 10.00, 12.00 or so at startup and 7.90 or so at idle, the setup in the pcm was around 12.00, 14.00 or so at startup and 9 at idle. Not sure what is up with it but any help is needed. The octane tables were also kinda crazy but it does run like this. Im not a tuner so dont have a screen shot or anything of it or any other way of telling you guys what it is but on the octane tables, near the end it was at 24, im guessing thats timing, stock is around 28. He siad it was going up and down in the tables.

Thanks for any input. We also tried pasting some of the tables in the stock tune but still wouldnt start. As stated, im using the tune that was in the pcm because it does work. I can try to get a copy of the current tune if that helps.

 

Is he doing a write entire or write calibration only?

 

tried both, we mainly did write entire.