I have a gen5 with 3.6" pulley and my own DHP tune. My mods include 3 inch catted down pipe, front power log, and 3 inch FWI (still on l67 throttlebody). Four days ago out of the blue my car started getting 10 degrees of KR when I went WOT. I noticed that when under load (not in neutral or park) when I give it above 50% throttle I get 10 degrees of KR. Before this started happening I would get blips of about 2 degrees at WOT with 16 degrees of timing.
I have checked the spark plugs and they are all fine. Oil has 1,500 miles on it and still amber. Fuel trims are good. Any other ideas?
I was thinking would it be possible that my Catalytic decided to fail? Just thought of that possibility today.
