Bullitt
Active Member
- Joined
- Oct 30, 2022
- Messages
- 35
- Location
- Central PA
- Occupation
- Manitou / Gehl & Yanmar Tech, Rental Monkey
John Deere 624K Wheel Loader
1DW624KZVEF663141
6.8L Powertech 6068 Level 33
Machine is very hard to start is cold temps.
When I was called out to the machine it was running very rough. Code 157.16 Fuel rail pressure high
Cylinder performance test was showing cylinders 4,5,6 more then 10% deviation from 1,2,3
Brought back to shop, machine seems to consume a lot of fuel and struggles under load.
Without a load actual fuel rail pressure stays in line with desired until reaching higher RPM where around 20k desired becomes about 24k actual and sets code.
Pressure stays over desired until idling for a moment.
Set machine engine off for 10min, fuel rail pressure reading was less then 145psi with scan tool
Pressure relief valve and solenoid was made new.
Disconnected return line from air to fuel cooler and routed into a 5gal pale to remove any downstream restriction.
Return was measured at MAYBE 25ml/min at 1800rpm.
Again performed cylinder performance and all cylinders within 2% of each other
But sustaining higher RPM brings back 157.16 code consistently
I pulled the injectors and sent them to a fuel injection shop too be tested.
Did it make sense too do this?
Any other recommendations for diagnosing this issue?
First time running into a rail pressure high situation, normally its too LOW not too HIGH!!
1DW624KZVEF663141
6.8L Powertech 6068 Level 33
Machine is very hard to start is cold temps.
When I was called out to the machine it was running very rough. Code 157.16 Fuel rail pressure high
Cylinder performance test was showing cylinders 4,5,6 more then 10% deviation from 1,2,3
Brought back to shop, machine seems to consume a lot of fuel and struggles under load.
Without a load actual fuel rail pressure stays in line with desired until reaching higher RPM where around 20k desired becomes about 24k actual and sets code.
Pressure stays over desired until idling for a moment.
Set machine engine off for 10min, fuel rail pressure reading was less then 145psi with scan tool
Pressure relief valve and solenoid was made new.
Disconnected return line from air to fuel cooler and routed into a 5gal pale to remove any downstream restriction.
Return was measured at MAYBE 25ml/min at 1800rpm.
Again performed cylinder performance and all cylinders within 2% of each other
But sustaining higher RPM brings back 157.16 code consistently
I pulled the injectors and sent them to a fuel injection shop too be tested.
Did it make sense too do this?
Any other recommendations for diagnosing this issue?
First time running into a rail pressure high situation, normally its too LOW not too HIGH!!