I've replaced the fuel pressure regulator and fuel filter this week. HKS Plugs and msd coils and fuel rail pressure sensor was replaced today. Plugs seemed to be gapped like the ones I took out. I didn't have a gap tool but since they looked the same in gap was I figured they were fine right out the box.Oscar, when did you replace the fuel system parts and the plugs? It could be the plugs if you‘ve fouled one or more. What did you replace them with; HK’s, NGK’s? Actual plug numbers please.
I’m still thinking about this. I’m attempting to eliminate possible issues. I’m going to collaborate with my tuner as well. Maybe we can recreate a similar issue with mine.
If your A/F ratio is fluctuating, you’d have a problem with fuel flow or control. Have you data-logged the HPFP pressure yet at WOT?👍🇺🇸
When I would data log for Nathan I would include RPM
Fuel rail pressure
My afr while idle seems to be between 12-14. While underload I'm not sure.
Lambda seems to be 12-15 while underload.