![]() ![]() There are a lot of things that cause fuel mileage to change that have nothing whatsoever to do with injectors. Start with an overhead, making sure your injectors are set properly. The pintle is basically a needle, and the outer portion of the tip on the internal circumference is a seat. Half stop and go, 10 lbs of boost or less, all 50 mph or below. I'm getting 5.3 mpg right now, 80 miles a day, 50% loaded miles, down from the 6.8 I was at before. ![]() ![]() I might swap the actuators around and see if it stays that way or if it flips around. The only thing I notice is it runs a bit rougher on 1,2 and 3 compared to the rear bank, which I would say is probably a sign of actuator wear. The correct method to measure is VOLUME return Rates, its easy with correct tools accurate and reliable. All holes pass the cylinder performance test. I would NEVER use contribution test VIA OBD to condemn injectors, The test is unreliable and is conditional, and changes according use, it should be use ONLY for touch tone purposes.Who knows, my 3 month old #6 could be where the leak is too. eventually the fuel cost will replace the bad injector anyway, but I'd rather not just throw parts at it. Diesel Injector Installation, Cummins ISX, Highway and Heavy Parts Diesel Tech TipsJoin Master Diesel Mechanic Mike Schrems, as he walks us through a fuel in. ![]() Is it possible as these things wear that some trash might get into the tip and 'temporarily' cause a leak? Would some power service possibly fix this? I ask because my mileage has gone down lately. ![]()
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