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2002 celect plus sputtering like dirty filter

i have recently replaced heades and injectors but now have engine sputtering in 9th and 10th gear when lugging even a little. starts fine, runs fine otherwise. fuel filter has been changed twice, foot pedal censor has been changed. not fault codes. wire harness has been checked. cummins check fuel pressure and said there was some air but nothing to worry about. i can rev engine at 1800 rpm when parked for extended period and cant get it to sputter. only does it when i lug it a little around 1400 rpm or more. when it sputters there is no response to fuel pedal and it looses power. i then let of pedal for 5-15 seconds then resume or down shift and resume depending on the pull. really seems to be a fuel problem. any help please.

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When you say it happens when you lug it around 1400 or more do you mean above or below 1400?

If you mean above 1400 then you probably don't have enough fuel pressure when you put some demand on the motor. Check the screen on the fuel pump.

It can be a lot of issues though so check them:

bad injector, bad fuel lines, bad crank position sensor, bad throttle position sensor, dirty fuel pump screen, clogged fuel/water separator or fills with water fast, bad intake air temp sensor, bad intake manifold pressure sensor, clogged ecm cooler, faulty ecm, bad ecm ground (blown fuse on ground wire), dirty air filter, weak fuel pump.

All of the above may cause an n14 to sputter without throwing a code. Install a FASS to get rid of the air in fuel.

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yes it only does it above 1400 rpm. cummins replaced engine sensor. i replaced pedal sensor.cummins checked ecm and wiring harness. you are prolly right on fuel blockage some where. if it were just an injector failing i should still have some fuel pedal responce i would think. i guess it will nickle and dime me to death till we find it.

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Check the screen on the pump first. It's on top left side of the unit (at least on my pump) and looks like about a 2" rounded nipple (giggle here...I did) with a bolt top. Undo that and inside there's a small spring and the screen. No need to replace the screen, just hit it with some brake cleaner if dirty.

...nipple :D

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Change screen. It comes with a new O ring. Everyone is overlooking the O ring can be old and dry and not sealing properly this this is where the air is getting in at high RPM’s and not throwing a code. This is what my problem was after spending money on sensors. This is all it was. My pump was a little damp around this plug which should have been a dead giveaway but I had to learn the hard way. Just had to add this to help someone else from spending unnecessary money.

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Ever figure out the issue?

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I would take it to Cummins and let them plug up the computer to it. They have one that they can plug to the data port inside the truck and allows them to read data while driving the truck. If it acts up while driving they might be able to figure out the problem.

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