I just went through this with a 5.7 vortec. The previous owner had installed the distributer wrong. Using a scanner I was able to read that my cam retard was -15. It should 0 plus or minus 2. I installed the distributer and set the cam retard(adjustable on the 5.7) to -1
No more codes.
Hi guys,
Just joined the site. There's a tonne of great info on here. Hopefully it will help me keep my poor old 1997 GMC 5.7 Yukon 4 door running.:newbie: