I have a question regarding CIS related to the condition of fuel injectors on my M103:
I checked duty cycle and other related items today on the 300SEL. Duty cycle was pretty much on the numbers, maybe just a little low at 46.95 % at idle and 48.5 % at 2500 rpm, which according to the information I have is pretty good. Close enough that I see no reason to fiddle with any settings unless there’s an expert in the house that can tell me why I would need to change it.
However, I’m wondering how I could determine how well my injectors are doing by these values. That is, if I had a leaky or dribbly injector, or injectors that had a bad pattern, would that be reflected in the duty cycle, that is, would the system attempt to correct for overfueling, and if so, how that might manifest itself.
Drivability is fine with no performance issues whatsoever. Idle is not 100% smooth, as I can feel little “bumps” in the idle at a stop or just sitting parked out of gear. This is what has me wondering is I might have a injector or two that aren’t performing well. I’m assuming the injectors in the engine are at least 100k miles old, if not more. I know the head was redone at around 180k, but I have no idea if the injectors were replaced at that time.
TIA,
Dan
I checked duty cycle and other related items today on the 300SEL. Duty cycle was pretty much on the numbers, maybe just a little low at 46.95 % at idle and 48.5 % at 2500 rpm, which according to the information I have is pretty good. Close enough that I see no reason to fiddle with any settings unless there’s an expert in the house that can tell me why I would need to change it.
However, I’m wondering how I could determine how well my injectors are doing by these values. That is, if I had a leaky or dribbly injector, or injectors that had a bad pattern, would that be reflected in the duty cycle, that is, would the system attempt to correct for overfueling, and if so, how that might manifest itself.
Drivability is fine with no performance issues whatsoever. Idle is not 100% smooth, as I can feel little “bumps” in the idle at a stop or just sitting parked out of gear. This is what has me wondering is I might have a injector or two that aren’t performing well. I’m assuming the injectors in the engine are at least 100k miles old, if not more. I know the head was redone at around 180k, but I have no idea if the injectors were replaced at that time.
TIA,
Dan