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Engine stumbles on acceleration

2000 Cummins N14 525hp. engine was running fine until 7 days ago it started a slight stumble upon acceleration. once i get to about 1200 rpm it quit. the problem started intermittantly. i have no lights on the dash showing anything. as of today the stumble has become more promenant. from 1st gear to 10th it stumbles for the first couple hundred rpm then goes away. im watching the oil extra close, no change in oil level. dont believe its getting fuel in the oil. new air,fuel filter. Engine position sensor plug shows no oil. checked wire harness to injectors couldnt see any damage. thank you

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i took it to cummins fri morning they found no codes. we did find excessive wear 1.7m miles worth on the aluminum roller plate for the accelerator pedal. i sanded it down , made the pedal roller easier but no change in stumbling. read your thread good tips but no change. seems to be happening more 5th gear and up to 10th. still searching and testing components. ohmed all the sensors, tested good.

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Having the same issue with my M11 any update?

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i mentioned some possible culprits in this thread: 2002 celect plus sputtering like dirty filter add the ambient air pressure sensor as well.

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If you will take it to a genuine Cummins dealer and allow them to connect the computer to it then run it down the road they can watch and see what the engine is doing. Might be the fastest way to fine the problem. I would also check my batteries and connections for corrosion, especially where the computer connections are.

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Fuel lines both pick up and return could have something to do with it if it's sucking air. How old are the fuel lines? They will swell inside as they age and cause a restriction and will also crack causing it to suck air.

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I have 1999 N14 525. I have a fuel restriction gauge which is a vacuum gauge. Check your restriction even if you changed filters. If the restriction is still there being a 2000 I would look at your fuel lines if they have not being changed. You could have a injector starting to stick. KR will not agree with this. I use Amsoil 2 cycle Saber Professional oil and split a quart between 2 150 gals tanks every fuel-up. I have four injectors with 994709 miles. I have one injector replaced 203786 miles ago and the other 104047. I tried regular 2 cycle oil at Wal-Mart didn't work. If you get the Amsoil 2 cycle oil, change fuel filter but fill it up with the 2 cycle oil instead of fuel. If you have trouble getting the oil e-mail me at hwytruck@wi.rr.com. I have about 92000 miles on fuel gauges under hwytruck.

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Did you find the problem? I am having exactly the same thing with my m11

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,,, mine is doing the same thing, got just over a million on 5 of them. I am 99 percent sure it's a single injector temporarily sticking. Just don't want to come off idle throttle sometimes. Many would put a six pack in it, but it is so nice and even when it's hitting on all six. Also once it takes throttle, say 3 pounds of boost, it stays fine all the way to 35 pounds of boost, and any throttle, in between, and this can be 50 miles on level road, but back off of it for a little down hill and one cylinder may not come back up. So have to walk into it again and it might pick up the dead one again.

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,,, also I ran the overhead back when it was cold, so did it again recently near 70 degrees, hoping it would clear it up ; absolutely no difference. I use the Malinson method of setting the injectors .

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,,, well, I ohm checked 'em, all .9, good. I noid light checked em, Box is good, see u tube for more sophisticated check with resistor, and I made a little jumper harness, to noid light check with the injector hooked Up and running with the light under my wiper all good. But then the bad injector did me a favor and went missing full time, and it didn't run an y different disconected, so I put a re-man in today and it is running Fine.

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I have a 1999 western star with a n14 cummins, and it has almost one million and a half miles on it. it started to stumble when it idled sometimes and when I hit the gas while pulling a load. it was the solenoid on one of the injectors. so I put a have a tool I bought from auto zone, I plug it in the wire that plugges into the injector and it flashes whenever it sends power to the injector and I found out it was number 3, or you yould unplug a injector wire while its idling, and see it changes or not and that will tell you. but after I replaced it I have gotten about 7thousond miles on it and I always am gross at 80 thousand and I climb the mountains out west. so id get that checked out.

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,,, the noid light, as in my posts and the one above, will tell if a signal is coming from the ecm, but not it's strengh, timing, or duration, in some systems pulse width; however I'd say if you have the light flash, the ecm is usually not the fault. Btw, it's a gas injection noid light from your auto parts store, but a good check.

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Hi,did you find out what was the problem with the stumbling on your N14? Have the same issue, if you solved it,please share...

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I had a stumble on my 2000 International with the N14 Celect Plus. It had a 6 pack of injectors put in approx 200k ago. The stumble started and in 2k miles went into full #6 injector fail. Now 3 weeks later, i am into a stumble again between 1200 and 1500 RPM, but then does take off. pointing to #3 injector. If unplugged at Idle it lags. If i unplug at 1400 RPM, it is changes nothing. so leads me to believe the injector is is failing. I did pull the injector, and test the pass through to be sure it was still good(known to fail as well). so i soaked the injector in cleaner, and then oil, and reinstalled. Seems like alot of BS, just to test. But what can you do? Well, it idled better, but still did the ol putt putt at 1300-1500 RPM. So, Injector is bad.

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