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Thread: Rough Idle - Loping Then Died?

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    Scrat0351's Avatar

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    Rough Idle - Loping Then Died?

    Hey guys, I have a 2018 RAM 3500 (Aisin) DRW with 150k miles.

    It is DRD tuned with a 5" turbo back exhaust; the FASS lift pump changed filters 3k miles ago.

    Everything else is in stock.

    I was driving the other day at a red light when it started idling rough and shaking and loping or missing.

    I didn't notice any smoke but didn't get out to look.

    I turned around to return home, and about 5 min later, at a red light, it died and never started back.

    I had it towed to my house, and it isn't throwing any codes on the MM3.

    I changed the crankcase position sensor, but it still won't start.

    I have no idea where or what to check.

    No codes to go off of, and it won't start.

    Before this happened it has been running fine.

    The only issue I've been having is the service electronic braking system coming on and off while driving.

    It comes up, then goes away, and does it repeatedly while driving.

    Any help or advice would be much appreciated.


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  3. Top Of Page | #2
    I WILL STAND! AK Bob's Avatar

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    Re: Rough Idle - Loping Then Died?

    Quote Originally Posted by Scrat0351 View Post
    Hey guys, I have a 2018 RAM 3500 with 150k miles.

    It is DRD tuned with a 5" turbo back exhaust; the FASS lift pump changed filters 3k miles ago.

    Everything else is in stock.

    I was driving the other day at a red light when it started idling rough and shaking and loping or missing.

    I didn't notice any smoke but didn't get out to look.

    I turned around to return home, and about 5 min later, at a red light, it died and never started back.

    I had it towed to my house, and it isn't throwing any codes on the MM3.

    I changed the crankcase position sensor, but it still won't start.

    I have no idea where or what to check.

    No codes to go off of, and it won't start.

    Before this happened it has been running fine.

    The only issue I've been having is the service electronic braking system coming on and off while driving.

    It comes up, then goes away, and does it repeatedly while driving.

    Any help or advice would be much appreciated.
    Does it crank (does the engine turn over)?

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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    I WILL STAND! AK Bob's Avatar

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    Re: Rough Idle - Loping Then Died?

    If the engine cranks, select the fuel rail pressure actual and desired PIDs and post back the pressures while cranking.

    You need over 4,000 psi actual to start and idle.

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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    Watch Dog! Corkey's Avatar

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    Re: Rough Idle - Loping Then Died?

    How long ago did you change the fuel filter?

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX, YUKON 4.56 GEARS W/ COVERS

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    Scrat0351's Avatar

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    Re: Rough Idle - Loping Then Died?

    Yes it turns over but doesn't even act like it might start.


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    Re: Rough Idle - Loping Then Died?

    I looked at desired and actual, and they were over 4k.

    It fluctuated between 4300 and 4800 mostly.

    Fuel filters were changed about three months ago with the oil.

    They have a little over 3k miles on them.


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    Re: Rough Idle - Loping Then Died?

    3 months, a little over 3k miles ago.


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    I WILL STAND! AK Bob's Avatar

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    Re: Rough Idle - Loping Then Died?

    Quote Originally Posted by Scrat0351 View Post
    I looked at desired and actual, and they were over 4k.

    It fluctuated between 4300 and 4800 mostly.

    Fuel filters were changed about three months ago with the oil.

    They have a little over 3k miles on them.
    So far, fuel pressure doesn’t seem to be the issue.

    You may have a bad Crankshaft Position Sensor.

    Try monitoring your RPM PID while cranking; it should show between 150 and 200 RPM while cranking.

    See the attached information with no start symptoms and testing strategies.

    Attached Files Attached Files
    Last edited by AK Bob; 02-03-2024 at 03:49 PM. Reason: Added attachment with additional information.
    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  17. Top Of Page | #9
    Scrat0351's Avatar

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    Re: Rough Idle - Loping Then Died?

    Quote Originally Posted by AK Bob View Post
    So far, fuel pressure doesn't seem to be the issue.

    You may have a bad Crankshaft Position Sensor.

    Try monitoring your RPM PID while cranking; it should show between 150 and 200 RPM while cranking.

    See the attached information with no start symptoms and testing strategies.
    Thanks for the information.

    I have been at work the last few days, so I haven't been able to try anything until today.

    Rail pressure is around 4800 with a max at 6k.

    RPMs are right around 175.

    I did change the crankshaft position sensor, but nothing changed.

    It has been in the low 70s and upper 60s here, but when I crank it, it keeps going into diesel preheat.

    I don't think it used to do that unless it was below 50's or 40's.

    I also removed fuel filters and emptied them.

    There doesn't appear to be any water, but the water filter is pretty heavy, so I ordered some new ones.

    I kept the same filters until new ones came in and primed it.

    The pump seems to be running longer than usual before cranking.

    I will start going down the list you sent (much appreciated) and keep you updated.

    Attached Images Attached Images

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  19. Top Of Page | #10
    Watch Dog! Corkey's Avatar

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    Re: Rough Idle - Loping Then Died?

    https://fassride.com/3-signs-time-ne...l-fuel-filter/

    Pretty good article to read.

    It might help out with troubleshooting.

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX, YUKON 4.56 GEARS W/ COVERS

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