Runaway - Ford Powerstroke Diesel Forum
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post #1 of 33 Old 03-23-2012, 01:14 PM Thread Starter
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Runaway

How can you prevent a runaway from happening or stop one that is happening? Also, can blue smoke be a turbo seal? i've heard a bad turbo seal can cause a runaway.
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post #2 of 33 Old 03-23-2012, 02:22 PM
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I believe that the only way to stop one is blocking the air or shutting off the fuel. If the runaway is coming from self supplied fuel (ie oil leaking from the turbo) then you must plug the air inlet

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post #3 of 33 Old 03-23-2012, 07:49 PM
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Only way is to cut off the air. If you have oil leaking by the turbo cutting off the fuel wont do anything. It will run off the oil. If your running down the highway best thing to do is put it in neutral and blow the motor. You can try and turn it off but I would dou t that would do anything.

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post #4 of 33 Old 03-24-2012, 01:01 AM
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Originally Posted by WarChild View Post
Only way is to cut off the air. If you have oil leaking by the turbo cutting off the fuel wont do anything. It will run off the oil. If your running down the highway best thing to do is put it in neutral and blow the motor. You can try and turn it off but I would dou t that would do anything.
"Fuel" can be diesel or oil (or any other carbon source for that matter). My original statement was a general one - you stop runaway diesel engines by stopping EITHER the source of the fuel OR the source of the air (from a purely theoretical perspective though - there is no runaway if there is no fuel supply.). In the case of a "runaway on oil", the oil is the fuel and since it is not really possible to stop that flow, then you have to stop the air. Just clarifying your clarification .............

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Last edited by bismic; 03-24-2012 at 03:39 AM.
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post #5 of 33 Old 03-24-2012, 03:08 AM
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You stop the air.

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post #6 of 33 Old 03-24-2012, 03:37 AM
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I think that point has been made - LOL

The statement was made that the ONLY way is to cut off the air. Not entirely true. Drain the oil (fumoto valve) and you can stop it also. Not sayin to do it that way, just being too theoretical I suppose ..........

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Last edited by bismic; 03-24-2012 at 03:46 AM.
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post #7 of 33 Old 03-24-2012, 05:47 AM
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post #8 of 33 Old 03-24-2012, 06:22 AM
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Bismic I wasnt clairifying anything. I was leaving my own comment. There is no way to drain the oil if your driving the truck.

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post #9 of 33 Old 03-24-2012, 06:25 AM
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If equipped with a manual transmission, stall the engine by selecting a high gear and letting out the clutch - with the brake engaged - after ensuring there are no people in the travelled path (usually not a problem when a diesel is in runaway). Obviously an automatic transmission does not have this capabilty.

Mark is right that shutting off the engine will have no effect on either a mechanical or electronic engine as the pressure in the crankcase supplies the engine oil as fuel to the pistons.

Yes blue smoke is a sign of oil in the combustion chamber or the exhaust and not a great thing to see. Overfilling the crankcase is more likely than a failed turbo seal as the intercooler could hold a significant quantity of oil before I imagine sufficient oil mist would provide additional fuel. One nice feature of the electronic monitoring from the PCM is that with unanticipated throttle up condition the engine would likely reduce fuel injection and this alone might avoid the runaway (complete speculation to be honest although I have heard of overspeed idle conditions that could indicate such).

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post #10 of 33 Old 03-24-2012, 06:28 AM
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If you get a diesel runaway on the road, you won't likely be driving (for long)...you'll have a plume of smoke from the engine bay.



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