98 w900 n14.
So wether i'm bobtailing, loaded or unloaded my truck is majorly cutting out while driving. Also like it's not getting fuel.
It's got a good, new fuel filter, good fuel, the cam/crank sensor is good. At this piont I'm at a loss. My mechanic thinks it could be the wire harness. Computer isn't showing any codes or anything wrong but the cutting out has goten worse.
Any thoughts?
98 w900 n14 cutting out while driving
Discussion in 'Kenworth Forum' started by irishluck09, Jul 29, 2022.
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Check all your battery cables first. At the battery and at the starter. Put a wrench on all of them and make sure clean and tight.
Second I would check fuel pressure -
Runs fine idling? My first assumption woukd be TPS. I'd watch TPS % and counts on the laptop while slowly pressing and releasing it. You can also use and ohmmeter.
Then i woukd check fuel pressure, and don't overlook fuel return.
Any smoke? -
My first thought is electric problem caused by moving/ driving.
Check the wires. Positive and grounds. Sounds like a loose connection or a short.
Check the fuel pump, power and solenoid.
2nd thought is fuel system. As driving you need more fuel and you have a restriction or air in system.
What type of filter, spin on or davco? Air getting into fuel lines.
Good luck -
So the truck idles fine, its just when I start driving. Batteries are brand new, tight and clean. No smoke except for typical small amounts of black smoke when under load. uses a spin on filter and is brand new.
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Does that model N14 still have the old style fuel shutdown solenoid?
When they get old or are going bad the 12v pt fuel shutdown solenoids are known to overheat and become intermittent while running. They can do this without any rhyme or reason. Start up fine and idle fine but as the fuel warms up coming through them they get hotter than normal and start to cut out causing them to shut off flow if only for a few split seconds at a time. It can eventually just burn out and cause a crank but no start situation.
Turn the thumb screw in to override the solenoid and see if it fixes the problem. Just keep in mind that the key will no longer shut the engine down.mile marker 27 Thanks this. -
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Does the fuel still run through the ECM plate? That plate is before the filter and will catch debris and stop up over time. In one of the elbows between the tank and pump will be a compucheck fitting. Put a restriction on it see if it’s above 5 or so
mile marker 27 and xsetra Thank this. -
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