myst
Member
Hey everyone. Just recently out of nowhere our 2005 sprinter 3500 started not firing on cylinder 1 and was hoping to get some help here. I know gas engines very well but not so much the diesels.
Anyways this is what is up and what I have tried up until now:
I never get a check engine light, only code P0301 sometimes.
I've tried unplugging each injector with engine running and when I unplug cylinder 2, 3, 4, or 5, you can see that the engine starts running worse so I know those injectors work. Only unplugging the cylinder 1 made no difference as to how the engine continues to run without the inject 1 plugged. I then switched injector 1 and 2 and got the same results. Unplugging cylinder 2 made the engine run worse, but still unplugging cylinder 1 mades no difference
I also wanted to make sure that cylinder 1 injector is getting signal from the ECU so I unplugged the cyl 1 and into the wirings harness plugged in a 12v LED bulb and the bulb blinks so injector harness should be fine, it is getting pulses from the ECU.
I even checked if the gas tank fuel pump works, I can hear it running when you first turn the ignition ON.
Also check the turbo and its in good condition.
Check all the intercooler hoses and they are good as well.
Diesel filter is new...
At this point I'm not sure what to try next. Any advice would be awesome awesome awesome.
Anything that I should check next that might cause cyl 1 misfire?
I know I should do a compression test next but I don't have one for this engine at the moment.
Anyways this is what is up and what I have tried up until now:
I never get a check engine light, only code P0301 sometimes.
I've tried unplugging each injector with engine running and when I unplug cylinder 2, 3, 4, or 5, you can see that the engine starts running worse so I know those injectors work. Only unplugging the cylinder 1 made no difference as to how the engine continues to run without the inject 1 plugged. I then switched injector 1 and 2 and got the same results. Unplugging cylinder 2 made the engine run worse, but still unplugging cylinder 1 mades no difference
I also wanted to make sure that cylinder 1 injector is getting signal from the ECU so I unplugged the cyl 1 and into the wirings harness plugged in a 12v LED bulb and the bulb blinks so injector harness should be fine, it is getting pulses from the ECU.
I even checked if the gas tank fuel pump works, I can hear it running when you first turn the ignition ON.
Also check the turbo and its in good condition.
Check all the intercooler hoses and they are good as well.
Diesel filter is new...
At this point I'm not sure what to try next. Any advice would be awesome awesome awesome.
Anything that I should check next that might cause cyl 1 misfire?
I know I should do a compression test next but I don't have one for this engine at the moment.