Mercedes W126 MY89 5.6L Fuel Pressure & Duty Cycle Test after 1 year of Big Repair & 3.7K driving
Since it was warm enough today, I figured I could do a system check to see if everything was still good after I did the big repair last year in January 2021. Note for the curious: I had my solder iron standing on the battery to heat up while I was doing this test and video. I replaced the connectors on the two wires for my mono valve after this test. The aux pump connectors are next inline with new connector housing. I have replaced / soldered app. 80 connector terminals in my engine bay so far and all connectors have gotten new connector housings. Now to the fuel pressure test: Control Pressure is at 6.15 Bar and differential is still at 0.4 Bar. I may have to replace or adjust my fuel pressure regulator. There is a Torx 27 (4.5mm) screw in the return port for adjustment. Clockwise increases control pressure, counter clockwise will decrease pressure. But, then I am using a low cost pressure tester ( around 85 bucks ) which could cause the 0.15 Bar increase. Otherwise, everything looks good considering the high mileage overall and that the heads were rebuilt 125K miles ago (2007)
Since it was warm enough today, I figured I could do a system check to see if everything was still good after I did the big repair last year in January 2021. Note for the curious: I had my solder iron standing on the battery to heat up while I was doing this test and video. I replaced the connectors on the two wires for my mono valve after this test. The aux pump connectors are next inline with new connector housing. I have replaced / soldered app. 80 connector terminals in my engine bay so far and all connectors have gotten new connector housings. Now to the fuel pressure test: Control Pressure is at 6.15 Bar and differential is still at 0.4 Bar. I may have to replace or adjust my fuel pressure regulator. There is a Torx 27 (4.5mm) screw in the return port for adjustment. Clockwise increases control pressure, counter clockwise will decrease pressure. But, then I am using a low cost pressure tester ( around 85 bucks ) which could cause the 0.15 Bar increase. Otherwise, everything looks good considering the high mileage overall and that the heads were rebuilt 125K miles ago (2007)