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West Point
The Library
6.4 Tech & FAQ
P0087
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[QUOTE="integritymechanicsbydavid, post: 1569368, member: 38890"] Just finished 500 mile break in on fresh KKD steel piston long block. KC Stage 2 low pressure turbo, 25 over injectors, running a break in tune. New AirDog 2 5G lift pump with RCD fuel bowl delete regulated return. I’ve have several issues maintaining the same pressure at the return gauge. While driving at 60 mph I felt a little slow down and looked at my Mini Maxx V1 and noticed the FRP had dropped to 1.8. Then I hit the throttle and it went back up to 10.7. I pulled over and checked the gauge at the return and it was down at 3psi. I turned it up to 7.5psi and cleared the code and drove some more. It happened again and I pulled over. I readjusted the pressures at both the regulator and pump to read 8psi at the gauge. Drove another 115 miles without issue and then it dropped to 1.8 and spiked up to 22.5 all within a second. Anyone have any ideas? The HPFP was replaced under a year ago. The HPFP gasket is motorcraft as well as the sensor but not the injector harness. I have injector knock at low RPMS but not idle and my tuner said it’s normal. I haven’t been able to catch and abnormalities with my Autel watching live data. Any help is appreciated. [/QUOTE]
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