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Old 01-23-2016, 01:11 PM
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How long would the Eco Diesel last?

Hearing about all the cars stranded on the PA Turnpike and on I 75 in KY, Wondering how long you could Idle the EcoD straight (assuming enough fuel..) if stranded, to keep heat going, etc? 20+ hours? More? Would the DPF fill up ?
Would it throw codes or shut down? Or would it Idle till it ran out of fuel?

Just wondering as I'm going thru the same way next week....

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Old 01-23-2016, 02:25 PM
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Re: How long would the Eco Diesel last?

I think it would idle till it ran dry. However, if it's real cold I'd be interested to see how much the temp will drop at idle. I could watch my VW TDI coolant temp drop from fully warm in 0 degree temps if I idled.
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Old 01-23-2016, 03:38 PM
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Well, presumably the DPF would fill up due to excessive idling and wouldn't go into regen at idle. While this leads to limp mode, I don't know if this would also lead to engine shutdown eventually.

I seem to recall one can do a regen while the vehicle is in park with the GDE tune. Holding the pedal to the floor will initiate the burn. This technique won't work with stock, which instead requires dealer service to initiate a regen once in limp mode.
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Old 01-23-2016, 04:09 PM
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Re: How long would the Eco Diesel last?

In Aus we have had users have their GCs go into regen while idle.
Holding pedal to floor will exacerbate the issue though. Limp mode is causing a shutdown, just a lock of gears and restriction in revs.
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Old 01-23-2016, 04:42 PM
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Quote:
Originally Posted by SNUKE View Post
In Aus we have had users have their GCs go into regen while idle.
That's interesting, but I wouldn't generally correlate the operation of the export Jeep diesels to a NA EcoDiesel. For example, your 2014 Grand Cherokee diesels also had (have?) a relatively common problem with the DPF filling rapidly and being unable to regen without dealer intervention. This is unheard of in the 2014 EcoDiesel. Your export Jeep diesels also don't have the OBD-II PID enabled that indicates whether regen mode is active, unlike EcoDiesels of the same model year.

It's weird that your export Jeep diesels would be so different in the operation of subsystems they share with EcoDiesels, but there it is.

Quote:
Holding pedal to floor will exacerbate the issue though.
As I said, this is a feature of the GDE tune, which is an aftermarket upgrade. Unfortunately, that's not available for your export Jeep diesel.
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Old 01-23-2016, 09:23 PM
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Re: How long would the Eco Diesel last?

If the <0.5 gph idle figures are correct as read through the OBDII port, you could idle for at least 48 hours on a full tank. The DPF would probably plug before then.
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Old 01-25-2016, 07:46 PM
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Re: How long would the Eco Diesel last?

Quote:
Originally Posted by Roadkill View Post
That's interesting, but I wouldn't generally correlate the operation of the export Jeep diesels to a NA EcoDiesel. For example, your 2014 Grand Cherokee diesels also had (have?) a relatively common problem with the DPF filling rapidly and being unable to regen without dealer intervention.
No, this isn't quite right, they don't fill rapidly, they just sometimes don't regen in conditions you would expect to regen (ie. highway driving). My view was that the computer was misreading the sensor inputs and deciding the value was out of range, therefore not initiating a burn.

I have read a number of NA owners having similar issues, but not on the scale we saw in the export model.

I think the behaviour would be the same, if you idled for long enough the filter would fill, and as you aren't in motion the regen wouldn't begin and you would be stuck in limp mode. However, the car should still idle in limp mode and you should still be able to run heating.

Of course a GDE or other type of tune may have different results.
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Old 01-25-2016, 08:18 PM
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Quote:
Originally Posted by Benn0 View Post
I think the behaviour would be the same, if you idled for long enough the filter would fill, and as you aren't in motion the regen wouldn't begin and you would be stuck in limp mode. However, the car should still idle in limp mode and you should still be able to run heating.
Of course we're both speculating what would happen because no one has run the experiment and reported the outcome both on the NA EcoDiesel as well as the export model, which we both agree is oddly different.

Naturally, this is all moot if the passengers die of carbon monoxide poisoning due to blocked exhaust, a case of which tragically happened during this recent snowstorm, when snow was covering the exhaust of an idling vehicle. Diesel engines may generally produce significantly less carbon monoxide than gasoline engines but it can still be lethal.

I wonder what happens when a DPF is 100% full and then idling continues to be run for hours and hours without a burn off. How much backpressure develops in the exhaust? Is the DPF permanently damaged at that point in terms of the regen cycle being unable to clear the soot?
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Old 01-25-2016, 11:09 PM
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Re: How long would the Eco Diesel last?

My SuperDuty at idle would use one oz per minute. The 1/2 gallon per hour sounds a little high so I would guess with a full tank 24.9 gals that would be what close to 50 hours of running.
You can't get all the fuel out but it would be a long time. I agree that the engine will have a hard time staying warm if super cold outside since there is no load on the engine.

Given the temps are now colder and winter blend I have seen my mileage drop to 25.9 mpg from what was 30-32 mpg.

I am curious as well what would happen at idle for a long period of time. I serious doubt that FCA has done this type of test...
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Old 01-26-2016, 09:20 AM
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Re: How long would the Eco Diesel last?

it'll run till its dry.
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Old 01-26-2016, 10:35 AM
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Re: How long would the Eco Diesel last?

Yeah that is just about the worst thing you can do for a diesel. Running one dry causes a lot of problems getting injectors bleed for a restart. Happened to me only a couple of times over the years... not fun...
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Old 01-26-2016, 10:42 AM
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Re: How long would the Eco Diesel last?

yeah, no s***. but if my ass was stuck in traffic during a blizzard I'd risk it. I wouldn't be worried about the injectors as much as the actual pump. of course I wouldn't do that on purpose, but it was a question of life or death, because people have died sitting in traffic in blizzards before.
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