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Thread: Run Away Diesel Engines?

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    toyota_mdt_tech's Avatar

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    Run Away Diesel Engines?

    OK, I dont never hear of it on these light-duty truck forms, but I know they make an air shut-off for emergencies; anyone ever has a runaway? (Youtube diesel runaways) I see lots of passenger vehicles in Europe etc.

    Now I have a throttling-type valve in my air inlet, but it's used to create a vacuum for EGR operation; this could close off my inlet air, but is it strong enough under a complete runaway scenario? Does it default to closed when I shut the key off?

    I know if I was hot-rodding it, be a bigger deal, but I am just curious; I don't hear anything about them here, which is good—just an inquiring mind.

    (I'm 100% stock).

    2010 Dodge 2500 SLT CCLB 4WD G56 Cummins 6.7 turbo diesel, 3.42 LSD. Add ons: Banks Monster Ram, Grid heater delete, Spyntec Free Spin Kit with Warn hubs (62672) Laramie Alloys (includes spare), "Powerwagon" Flares, Powerwagon bed decal (4X4 off road) OE Ram mudflaps, OE Slush Mats, OE Clearance Lamps, Geno's shift knob in black, 5" DPF back with muffler delete, spray in bedliner, OE brake controller, Durafit Seat Covers, Pro Tech Toolbox, Speed Turtle, Upfitter switches, Ham Radios, 8 Antennas, headache rack, emergency light bar,....

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    Permanent Vacation Chrisn162001's Avatar

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    Run Away Diesel Engines?

    I’ve seen one runaway situation on a common rail Cummins in 17 years of working on them and racing them.

    It was caused by an injector nozzle being loose on a set of freshly installed injectors.

    It’s not a concern I’d give any thought to, even on high-hp trucks.

    The air shut-offs you see are mostly made for sled pullers, they are required in some classes to be tied to the sled in case the truck breaks free from the sled.


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    I WILL STAND! AK Bob's Avatar

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    Run Away Diesel Engines?

    I see BD Diesel has an air shutoff kit that uses a module to control the stock throttle valve.

    https://us.bddiesel.com/products/6-7...-off-2010-2018

    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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    Sacker's Avatar

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    Re: Run Away Diesel Engines?

    I've heard of a runaway diesel fuel delivery truck.

    The diesel engine was running to power a transfer pump pumping gasoline into a tank.

    Gas fumes made their way to the diesel intake and caused the engine to run away.

    This was ~40 years ago.

    Typically runaways are caused by the rack getting stuck open on a mechanical injection pump.

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