Hi Guys,
'99 Pontiac Grand Prix GTP 3800SC Engine sitting in a '96 Pontiac Sunfire. Project was built in 2005. No issues prior. Had PCM flashed offsite once after install to clean up error codes and more performance. Been running fine. Can READ and CLEAR error codes with hand reader.
Used the HPTuner VCM Editor to download original firmware from PCM to change fan setup. SAVED as ORIGINAL !!! Sat on the file for a couple of days.
After watching videos on YouTube on how to change Fan setup, I did it. Saved new file as such.
Uploaded the new firmware to the PCM, and it worked.
After driving it for a Day (rather hard), I noticed the Check Engine Light wasn't coming on (usually P0300 because I hit the Rev-limiter to many times). Plugged reader in, and I had P0300 and P0138. No Check Engine Light.
Cleared codes. Unplugged TPS, got a code but no MIL Light. Showed MIL OFF on the reader. Before it would show MIL ON. Then I realized I hadn't got any MIL lights for about a week (Prior to the Upload).
Got with my son who programs with HPTuners a lot and started looking at the settings. The MIL or SES settings weren't even close according to him.
Check Engine Light comes on a Key On and goes out after startup, so I know the PCM is sending a signal to it.
Fearful of driving it blind.
Any Ideas ?
I have used this Tuner on my 2009 Pontiac G6 with no issues....