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| Everytime I shift it misses and then stops missing once the rpm's come up a little and the oil pressure rises. The engine has 500000 miles and hasn't been rebuilt yet. Oil pressure drops to about 12 pounds on the dash gauge when it is hot and idleing. It is in a 95 Freightliner.TIA |
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Mount Vernon, WA | No. Low oil pressure will cause the check engine light to come on, and, if programmed to, shut the engine down after 30 seconds. It will not cause it to miss. |
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| Is it a mechanical or electronically controlled Celect engine? The mechanical N14 engines use engine oil to control timing advance. We recently bought a '94 Ford with a mechanical N14 and it would miss and run poor for the first few seconds when you started it up. Last week I adjusted the valves and injectors and haven't run it much yet but it does seem better. Ours will run about 20 psi when it is hot at idle. |
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| It is electronically controlled. We have a tractor with an N 14 that has that Step Timing Control that starts up like you are describing. The boost gauge really flutters around at the same rpm level as the missing is happening and it quits fluttering about the same time the miss clears up??????? |
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| We have a 9370 with a mechanical N14 too. That one seems to start just fine for us but it has a lot fewer hours/miles I think. I started the truck earlier last week to bring in to the shop to work on and it hadn't been run for awhile and was about as cold as we've seen around here so far. It cranked real good but wouldn't quite fire up. I gave it a little throttle while cranking it and it fired right up and ran fine right from the get go. Since your truck has an electronic engine, I would check to see if it is throwing any codes or run some diagnostic tests, even if it isn't necessarily giving a check engine light. Hopefully you can find a shop that won't charge too much to check it out. If none of that I would guess it is an issue with an injector rather than the engine needing an overhaul or anything. |
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Leeds, North Dakota | Is engine oil overfull, { diesel} in it, when has overhead been set, I would have this checked, could be brgs, what is oil pressure when cold, need to know more details, Bern and I will help, need more info, Scott. |
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north central nebraska | my n 14 staryted missing one day at an idle .found out 2 piston coolers were broke off and let the oil pressure down at idle speed. they're made out of plastic! you can change them from the outside of the engine . |
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| The oil isn't overfull and we set the overhead but it didn't change anything. I think the oil pressure goes up to 45 to 50 when cold. The truck came with a pretty good record keeping. If the book is right it has has all the injectors replaced at one time or another except on cylinders 5 and 6. When you check the temperature on the exhaust manifold they are close except for # 3 which is hotter then the rest. |
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| I am going to pull the oil pan off today and check the bearings and will look at those plastic nozzles. I wonder if they break off themselves from getting old and vibration??? Will new rod bearings increase the oil pressure much? Cummins says 10 psi is okay at idle. Thanks |
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Leeds, North Dakota | Darren, when you get pan off look at cam lobes, bet there is your issue, keep us posted, Scott. |
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| Mine would miss every time I grabbed another gear. Westmans would sit in the shop with there fancy laptop for hours and never figure out anything. One day I had enough and pulled into River Valley, a guy came out with a little hand held electrical device of some kind and rode along. He could kill each injector one at a time. It was number 5 and it would only do it at certain rpm's. I spent thousands of $ at westman and never got anywhere, and river valley charged me $75, I went back to westmans and made them fix it for free.
Edited by nelsongraves 1/1/2012 16:35
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Morgantown, Indiana | mine was the injector |
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East Central MO-Audrain/Pike Counties | Mine was also injector. The one I replaced only lasted a few monthes and had to be replaced again. Fuel pump was also replaced with 1st injector. |
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| I didn't look at the lobes but all the oil squirter things looked okay. The # 6 rod bearing is showing the brass(copper???) on the top shell but not on the bottom. Will look at the lobes. Is it standard procedure to change both the mains and rods or can I just change the rod bearngs? Thanks Scott.
Edited by stratos 1/1/2012 19:23
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| Wow that sounds like what mine does. I will have to find a shop that can do what you have explained. Thanks nelson
Edited by stratos 1/1/2012 19:22
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Leeds, North Dakota | Would replace rods and mains, Scott. |
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N14 missing- Will low oil pressure cause this
