Okay.. Let's see if I can explain this in the quickest way possible. Started with a 411 PCM from a 2000 truck. I licensed the PCM and began tuning. Everything is good with the tune/truck/programming until I swapped in electric fans. Figured out the O/S that was on the original PCM could not properly run the fans. At that point, I swapped the O/S (and had to pay 2 credits for the new O/S) AND I also changed the VIN in the tune to the correct VIN # for my truck. This is where the problem started. My truck originally was a V6 truck. I noticed immediately after doing a WRITE ENTIRE with the new O/S and inputting the trucks original VIN # that the tach is now reading incorrectly. Tach was SPOT ON PERFECT before the O/S VIN swap. I believe the PCM is using the VIN to determine how many cylinders and the tach is off (high) because of the VIN I put in.
Today, I tried to change the VIN back to the original VIN # that was tied to the computer as it was a V8 VIN. HP Tuners is telling me that I have not licensed that VIN... But I DID. So, I went and looked at all of my licenses in HPT and tried to use those VIN #'s and same message-I have to pay 2 credits to change the VIN. Is this normal, or am I doing something wrong? I just want to change the VIN to fix the tach settings. The 2nd reason I'm wanting to change the VIN back to a V8 VIN is because I'm having a misfire and when I plug in my Snap On Solus scanner-it only tracks misfire data on 6 cylinders!!!!!!!! Am I really going to have to spend $100 just to swap my VIN to a V8 VIN???? Is there a way to work around this?