2015 GMC Duramax Runaway
Wow.... And less than 4k miles too. Link
Forum Discussion
FishOnOne wrote:Greentreena wrote:
Wow: that is unreal! What caused that??
Never heard of a runaway diesel? It's when a uncontrolled source of fuel (i.e. engine oil) enters the intake and the engine goes into max rpm mode.
Would love to know the results of the tear down of the engine, and the source of the oil in the intake system!!
This is for diesel newbies or gassers that don't understand how a diesel runs. Diesel has no throttle plate or ignition system, the method of "Turning off" a diesel is to STOP the supply of fuel. Not like a gas engine where lack of a spark stops the engine. Diesel ignites fuel by the heat of compression, so as long as it has a source of fuel it will run as fast as it can get fuel!
The only way to stop a run away is to remove the air supply, either by blocking the air supply, or displacing the oxygen with CO2 or Halon.
The most common source is a failed seal on the turbo. As mentioned before a CO2 extinguisher is the best insurance to stop this. Just point it at the air intake a let go with a good blast to rob the engine of air.
