Hi everyone,
Just bought my first sprinter van, a 2008 with a OM462 engine. 222k miles on the chassis but the engine was replaced 50k ago. Here is my issue, when accelerating foot to the floor occasionally a check engine light pops and it loses most of the power. I can maintain 60 on flat ground but any slope and it slows rapidly. I am a long time Ford tech but this is Greek to me. The freeze frame data for two code pops
RPM 3440 3100
Quantity Control Valve 12.4% 14.0%
Rail Pressure Commanded 1518 bar 1511 bar
Rail Pressure Actual 1314 bar 1321 bar
I can generate 1500 bar if I am careful with the throttle and don't trip the DTC. I replaced the fuel filter as the first and easy check. Problem still happens. Tested low fuel pressure at idle 58 psi in and out of the filter so I don't believe that is the issue. However I do understand that the pump my be dropping out under heavy load, I will try to tape a gauge to the windshield and check pressure under load when I get a chance. There are no leaks that I can tell from any of the injectors and certainly no high pressure line leaks. The nearest Sprinter trained technician is over 200 miles away so I'd rather like to try and crack this nut on my own. Any guesses from the Mercedes gurus on here? Thanks for any help!
Just bought my first sprinter van, a 2008 with a OM462 engine. 222k miles on the chassis but the engine was replaced 50k ago. Here is my issue, when accelerating foot to the floor occasionally a check engine light pops and it loses most of the power. I can maintain 60 on flat ground but any slope and it slows rapidly. I am a long time Ford tech but this is Greek to me. The freeze frame data for two code pops
RPM 3440 3100
Quantity Control Valve 12.4% 14.0%
Rail Pressure Commanded 1518 bar 1511 bar
Rail Pressure Actual 1314 bar 1321 bar
I can generate 1500 bar if I am careful with the throttle and don't trip the DTC. I replaced the fuel filter as the first and easy check. Problem still happens. Tested low fuel pressure at idle 58 psi in and out of the filter so I don't believe that is the issue. However I do understand that the pump my be dropping out under heavy load, I will try to tape a gauge to the windshield and check pressure under load when I get a chance. There are no leaks that I can tell from any of the injectors and certainly no high pressure line leaks. The nearest Sprinter trained technician is over 200 miles away so I'd rather like to try and crack this nut on my own. Any guesses from the Mercedes gurus on here? Thanks for any help!