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Old 08-01-2018, 08:33 AM   #1
mfsuper90
 
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N14 celect issues

We have a N14 celect that is missing under load. It seems to clear up above 1500rpm, and it doesn’t do it at idle, or when free revving it. I have unplugged injectors whole it’s idling, but all 6 make it miss. Temps on the exhaust manifold seem to vary between 120-200, with most hovering around the 130 range, and #4 being the only one distinctly higher at 200F.

Engine number is 11740205, Best I can tell from the tag.

Anyone have any trouble shooting advise?

Thanks,
Eric
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Old 08-01-2018, 08:38 AM   #2
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It's a pain in the ass, but being that I'm sure you have at least one bad injector.
I've had customers that will purchase one injector, pick a cylinder and replace it. If that doesn't work. Put the one you just removed into the next cylinder, and so on until you hit the correct cylinder. Depending on mileage, you may want to think about buying 6, and be done. Cummins usually has a buy 6 get one free rebate going on.

Last edited by Snedge; 08-01-2018 at 08:41 AM.
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Old 08-01-2018, 09:05 AM   #3
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This truck doesn’t get driven a lot, it’s got a 5000 gallon manure tanker on the back of it, so it spends most of its time in the barn when we can’t spread. Gets used twice a year, maybe no more than 1,000 miles a year. But a lot of them are field miles spent running wide open.

I was thinking it was an injector as well, which sucks because we put 6 new injectors in it a couple years ago.

Thanks for the info snedge. Looks like we might just have to buy one and start swapping.
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MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
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Old 08-01-2018, 10:45 AM   #4
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Quote:
Originally Posted by mfsuper90 View Post

Thanks for the info snedge. Looks like we might just have to buy one and start swapping.
That's about the only way to do it.
The miss/Stumble usually happens so fast that Insite won't pick it up, and cutting out cylinders during a road test is worthless. Insite allows us to do a cylinder performance test that will sometime smoke out the bad cylinder, but mostly we end up doing the process of elimination method. We can swap an N14 injector in under an hour in most cases, but it can still be time consuming.


If the truck sets for awhile, you could always pull all six and send them out for testing.

Last edited by Snedge; 08-01-2018 at 10:54 AM.
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Old 08-02-2018, 09:20 AM   #5
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Can just about any competent injection service test them?
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Old 08-02-2018, 11:28 AM   #6
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We use Diesel Controls over in Massillon Ohio
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Old 08-03-2018, 08:04 AM   #7
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Quote:
Originally Posted by Snedge View Post
We use Diesel Controls over in Massillon Ohio
That’s not too far. We bought the injectors from mountaineer diesel
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MF Super 90 various odds and ends done. Farm stocker
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'14 Ram Anarchy EFI, G56
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Old 08-07-2018, 06:17 PM   #8
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While we are on the n14 issues, sometimes both of our trucks with n14s roll for a very long time before they start. I briefly watched a video awhile ago that show a fuel fitting getting plugged up causing hard starts. Is this valid?
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MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
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Old 08-07-2018, 07:44 PM   #9
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Yes, that is accurate. The one fitting by the ECM is a check valve. If anything gets in that check valve and causes it to stick open the fuel will drain back and cause an extended crank after they’ve sat for a bit. It’s been about 8 years ago that I dealt with it on an N14 Celect Plus that I had.
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Old 08-07-2018, 10:08 PM   #10
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That makes sense, cause they always start if you crank them long enough.

Thanks for the help
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MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
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Old 08-08-2018, 07:05 AM   #11
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On my N14 the fuel filter was on the back of the pump which meant the fuel was not filtered when it came thru that check valve. Mine had a piece of what looked like coating off of a wire stuck in it holding it open. An old Cummins mechanic got me all the parts (except 1 line I had to get made) to put a stand-alone fuel dampener on the pump, and move the filter up stream to where the fuel was filtered when it came thru the check valve. All OE parts, cost about $250, took a couple hours to do, and made a world of difference in how it started, and never had to mess with it again.
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Old 08-08-2018, 10:04 AM   #12
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Run the motor and use an inferred thermometer on the manifold and to check each cylinder. A good way to test and see which cylinder may be giving you a problem.
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