I recently did a DOD delete on my ‘15 Silverado due to lifter failure. I went with an L86 cam and LS7 lifters, the typical delete. Once she was 100% I took it on a test drive and was very happy with the performance and smooth engine. Next day put about 25 miles on it and it just died while at an idle and would not restart. I chocked it up to bad HPFP so I replaced it and it fired up without hesitation. I was back on the road. An hour later I was home and let it idle for about 15 minutes before taking off again. When I tried to take off it died again, and like before wouldn’t restart.
I ran diagnostics on it and showed static readings on the cam position sensor and MAP sensor so I replaced both, as well as the crank sensor (just an “I wonder” swap on it). Static readings were resolved, but overall, no change in the situation. I am showing good fuel pressure and the spark is strong. Almost seems like something is telling the injectors not to engage. All fuses and relays are good and I am at a loss for what else it could be. It cranks over very well, just not firing. Any one have similar issues or possible clues as to what is going on?

 

It's hard to imagine that you had a HPFP and 3 sensors all fail in such a short period of time. I'm wondering if you have an engine harness issue. Have you checked your grounds?

 

I checked all of the grounds. And they all seem good. The HPFP was weak to begin with, just had trouble getting my hands on one. I’ve gotten just over 200 miles on it now and the issue has only happened once more since my initial post (still weary of it though).

Now I’m getting a P06DD code for the oil pump. Its a permanent code that’s not triggering the check engine light, but I am noticing the fuel pressure is starting to hang around 10-15 at idle once warm, but picks back up to 40-50 range when driving.

I know there’s a learning curve for the computer with all of the new parts, just not sure if that’s what I’m experiencing at this time.