1. Will_TX

    My 2013 Ram 3500 with 115,000 miles is having an issue. No mods, no tuning.

    When first accelerating from a stop, the engine will begin to speed up but then "stumble" as if starving for fuel for a second or less. Then it picks right back up like normal. This seems to happen less often when I am very gentle on the throttle. It only happens from a stop. At any speed greater than a stop, I have no issues.

    This has been occurring for a year or so but has gotten more frequent in the last two weeks.

    From what I have read this could be an issue with the fuel control actuator/solenoid/FCA. I am curious if anything else could lead to this problem before I fire up the parts cannon. Another cause some people have suggested is bad fuel or filters. My company sells fuel and my pickup and trucks at work fill up from the same bulk tank. No other vehicle has issues with the diesel. I am confident the filters are good since I got them from Geno's Garage. Mopar F/W seperator and Fleetguard FF53000 fuel filter. Both filters were changed ~5000 miles ago.

    I tried some data logging from AlfaOBD for the actual rail pressure and the commanded rail pressure. You can see how the rail pressure reacts to the commanded rail pressure and throttle position. I marked green lines where there are discrepancies. You can see how the rail pressure drops out when the commanded pressure increases rapidly. The first four screenshots are from a stop. The last one is at 75mph with the cruise control on.

    Screenshot_20240701-073615(1).png


    Any other suggestions to look into before throwing $200 parts at it?

    View attachment 140977
     
    Last edited: Jul 1, 2024 at 9:36 AM
    Diesel85 likes this.
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