Ok so still having issues with the high side pressure. Truck is going into Reduced Power Mode, Codes are as follows
0x7E8: P0089 - Fuel Pressure Regulator Performance (SES, Pending, Current, Old, History)
0x7E8: P0106 - Manifold Absolute Pressure/BARO Sensor Range/Performance (Pending)
0x7E8: P228C - Fuel Pressure Regulator Control Performance - Low Pressure (SES, Pending, Current, Old, History)
Below is a list of things I have changed. Truck ran fine stock. I added a Whipple, 103mm TB, LT4 HPFP, Injectors, and added the low side feed pipe without the check valve......... After the install it has the High Side fuel pressure issues
1. New LT4 HPFP replaced with a different NEW LT4 HPFP. no change
2. Replaced Fuel Rail Wire harness Verified Good. no change
3. Replaced Fuel Rail Pressure sensor with a New GM part. no change
the only thing I havent touched was the New LT4 fuel injectors that were installed. They were bought from a vendor as new.
Would a set of injectors that are bad cause the Low High Side Pressure???
Things i cant figure out. Ive posted 2 logs as well as the tune.
Why is the injector pulse with so damn high???? I thought any thing over 5-6ms is bad. Im seeing 19-20ms on light throttle as seen in the around the block log file
Also any clue on the rev up file, the HPFP started making pressure above approx 2500 RPMS but just matches the low side at any other RPM????
Ive been fighting this low high side fuel for 2 weeks wrenching on the truck after work, and im beyond frustrated and ready to take the whipple and LT4 stuff off just to be able to drive the truck.
Id Gladly Pay anyone that can figure something out and make this truck drive able again