I have a scan tool with which I can read real time data from some of the sensors. I have a continuous P0014 code and am going to replace my new CPAS from Advance Auto with an OEM with the pigtail as well. My question is: what should the timing advance during driving be? Currently it shows approximately 25.5 degrees BTDC. I would think that's high. My Envoy is a 2002 with 228,000 miles. I have switched to full synthetic 5W-30 over the last 50K. I have owned this since new and change the oil evry 3,000 - 4,000 miles. Thanks for your help in advance..