Our Duramax L5P has 19,000 miles on it now, mostly pulling our 5th wheel trailer. Since about 10,000 miles I have noticed a small lope in the idle, which progressed to what I would call a slight miss in what felt like one cylinder. I noticed no difference in power or fuel economy while pulling. The miss was much more noticeable at a cold idle than it was after pulling. Almost all fuel was purchased at either TA or Petro truck stops.
I haven't run an fuel additives in this truck, but decided to try a fuel injector cleaner to see if it made any difference. We just pulled the trailer 1,300 miles and within the first 500 miles the rough idle was much better. At the end of the 1,300 miles, the idle was completely smooth, just like it was when the truck was new. I have read that the common rail injectors are prone to clogging, not through coking, but through internal deposits of sodium salts of alkenyl succinic acids. These salts are insoluble in fuel and come from contamination at the refinery all the way through the delivery system.
The Power Service Kleen Diesel did the job of cleaning the injector(s) that had deposits and returned the idle back to creamy smooth. There are probably several other products that will do the same, but when I find something that works, I stick with it. I'll be running a maintenance dose of Kleen Diesel continuously. My opinion is that everyone who has a common rail diesel should consider doing the same.
I haven't run an fuel additives in this truck, but decided to try a fuel injector cleaner to see if it made any difference. We just pulled the trailer 1,300 miles and within the first 500 miles the rough idle was much better. At the end of the 1,300 miles, the idle was completely smooth, just like it was when the truck was new. I have read that the common rail injectors are prone to clogging, not through coking, but through internal deposits of sodium salts of alkenyl succinic acids. These salts are insoluble in fuel and come from contamination at the refinery all the way through the delivery system.
The Power Service Kleen Diesel did the job of cleaning the injector(s) that had deposits and returned the idle back to creamy smooth. There are probably several other products that will do the same, but when I find something that works, I stick with it. I'll be running a maintenance dose of Kleen Diesel continuously. My opinion is that everyone who has a common rail diesel should consider doing the same.