John White
Well-Known Member
I have a 2003 KW and recently have been having some problems. The engine has 80k miles. Truck has 300k. It is a septic pumper truck and will idle for 30 or 45 min while pumping a septic tank. I have heard that Cats don't like to idle for a long period of time. After finishing up and starting out it will smoke like a injector is bad for about a mile or two and no power. First time it has ever done that I turned the key off and back on and and it seemed to clear up. Thought it was just a one time situation. It ran ok for several more days. Then a day or so ago I pumped a tank and did same thing, smoke finally cleared up but no power all the way back to shop. Next morning it started up fine, ran to the dump station and went on another pump job, ran fine, pumped tank and set idle higher this time, started out, no smoke but no power for about 5 miles, then started running fine. About 5 years ago I replaced the engine, old engine had a bad cylinder on #6, had to replace engine, (block had a big ridge they said from injector failure) I never had Cat cleat the codes. I checked the codes yesterday and it says code 74 which is#5 or 6 bad injector. Could these codes still be there from old engine failure?. No engine lights have come on. If it is a injector sticking sometimes could I put some Lucas or some other injector lube in the fuel and clear it up? I checked my mileage and it fuel filters were replaced at 30K . I think that is way past due. I can't find a good answer on how often they should be replaced. Some say every 10k, some say 30k, some say every other oil change. Cat can't get me in for two weeks. I am going to replace the fuel filters and try pumping another tank and see what happens. If it doesn't run right I will just have to let it set till I can get it into Cat and run a scan. I can replace the injector myself but I want to know what one it is and if the codes are from old engine failure. Any help appreciated.