dragstang86

So on my wife's 2017 Sierra 6.2 I am finishing up an engine rebuild and AFM delete. The high pressure lines, well #12677002 is back ordered everywhere. The lines that I have, were only on the truck for about 5 miles. It broke a lifter, I replaced the lifter and replaced the lines when I did it and 5 miles after putting it all back together, the cam bolt/VVT solenoid broke so I pulled it out and just did a full rebuild and delete. Now since I can't find the one line, I'm wondering if I could get away with using these twice. Has anyone tried it? Did you polish the ball end before doing so? Put a pound or two extra torque on it? It would be frustrating now that I have the engine almost assembled to put it in the truck and sit for who knows how long on a fuel line.

Welp, dug further and the cam isn't moving either so it either broke the chain or sheared the cam bolts. Thinking at this point I might as well just pull it and do a delete and freshen everything up along with some upgrades.

Pulled it back apart today and confirmed that the lifter that drives the high pressure pump isn't doing anything. Has anyone had one of these fail before?

Well I put it back together to confirm the sensor didn't fix the issue.

So I have been fighting a no start condition that started 5 miles after replacing the lifters on Bank 2 and also replaced all the injectors while I was in there. I took it on a test drive and 5 miles in the truck went into limp mode all of sudden for a second or two then just shutoff and hasn't started since. The code is P00C6 and shows low rail pressure and the rail pressure only shows to be 65-70 while the low pressure side around 80 or so. I figured something happened to the high pressure pump so I replaced it and still have the same issue. I then noticed that the fuel temperature also reads -40 and it appears the fuel rail pressure and fuel temperature sensor is one in the same (if it even supports fuel temperature) which made think sensor is bad. The thought was the computer thinks the pressure is way too low and not even firing the injectors. I just got a new sensor and ohm it compared to the old one and it is about identical. I'm getting about 140 ohms between the 5v terminal and the outer signal wire on both sensors. I am getting open to the center terminal and either terminal on both sensors. On the truck side I am getting 5v at the plug. I am getting continuity between the 5v wire and the outer signal wire and getting 50 ohms between the 5v wire and the center signal wire and 50 ohm between the two signal wires. Has anyone seen anything like this before? 2017 GMC Sierra 6.2

What is the normal fuel rail pressure for a 2017 Sierra with a 6.2? I am chasing a no start condition along with a P00C6 - Fuel Rail Pressure Too Low - Engine Cranking Bank 1. I'm not sure what normal is. While checking it with key on and cranking, I have seen it anywhere from 520 - 600 kpa which is like 75-85 psi. What should it be?

Did you ever figure out this issue? I'm fighting similar issues.

So I just finished replacing lifters on the passenger side bank as number 8 exhaust lifter (non-AFM lifter) was destroyed. I got it back together and fired it up and everything seemed fine. No more noise, misfire was gone etc. Took it for a test drive and was running great but about 5 miles in, the dash displayed limp mode and a second or two later shut off and wouldn't restart. Crank but no start. I pulled the codes and it shows: P0113 - Intake Air Temperature Sensor 1 Circuit High Bank 1 P2227 - Barometric Pressure Sensor A Circuit Range / Performance P0068 - MAP/MAF - Throttle Position Correlation Since they are all in the same area I figured a ground was left off or maybe a connector. I went through and everything is plugged in. All grounds I can find are hooked up and tight (including the one on the back of the passenger side head). I inspected the wiring harness as best as I could and no sign of any rubbing anywhere. These codes also won't clear. I checked all the fuses in the under hood fuse box and all are fine. I pulled live data with ignition on (obviously not running since it won't start) and all seem to be where I expected with maybe the exception of the TPS. IAT - 40 degrees Celsius MAP kpa - 102 Barometer kpa - 101 TP(%) - Sometimes it rests at about 22% and others 32% and about 38% with the pedal to the floor. When I physically checked the throttle body, it does rest open further than I would expect so that % is probably pretty accurate to why I am seeing looking at the throttle blade. I'd expected this to be close to 0% at rest but is this normal? Any ideas on where to go from here? Obviously I can't see all these sensors just going bad together and the fact that I am getting normal readings really has me stumped.