idling question????
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Senior User
Joined: Jul 2012
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From: Arizona
idling question????
While snooping around these 6.7 posts I have seen mention that they should not be idled for any amount of time. WHY??? Emissions???
Just curious, Thanks for explaining.
Just curious, Thanks for explaining.
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
For starter...zero miles to the gallon.
Idling on newer modern diesels with the emissions systems presents problems over time.
First is going to be soot production. Excessive idling and the DPF system and EGR don't go well.
Your motor will need to clean the exhaust filter (DPF) more often.
The EGR cooler will start to gum up causing issues.
Idling on newer modern diesels with the emissions systems presents problems over time.
First is going to be soot production. Excessive idling and the DPF system and EGR don't go well.
Your motor will need to clean the exhaust filter (DPF) more often.
The EGR cooler will start to gum up causing issues.
Post Fiend
Joined: Jan 2009
Posts: 6,521
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From: Greenwood, SC
It is the emissions equipment and the no idle suggestion applies to any diesel made by any manufacturer since 2007. Just as "unhealthy" for a Mercedes, cummins, Volvo, etc....
It is too often forgotten that some of these issues that people like to use to criticize the powerstroke apply to all the engines.
Technically, I think the issue is that with the use of egr and an engine that can cool itself off very quickly leads to things getting dirty inside. The fuel management on these motors is crazy precise and exhaust temperatures can be reduced so quickly, there is very little residual heat that can be used to keep itself running efficiently during idle.
I can't imagine that wet stacking would be a problem with the systems ability to measure the amount of fuel sent into the combustion, but I'm no expert, just opinions.
It is too often forgotten that some of these issues that people like to use to criticize the powerstroke apply to all the engines.
Technically, I think the issue is that with the use of egr and an engine that can cool itself off very quickly leads to things getting dirty inside. The fuel management on these motors is crazy precise and exhaust temperatures can be reduced so quickly, there is very little residual heat that can be used to keep itself running efficiently during idle.
I can't imagine that wet stacking would be a problem with the systems ability to measure the amount of fuel sent into the combustion, but I'm no expert, just opinions.
Laughing Gas
Joined: Jul 2010
Posts: 859
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From: North Carolina
When it comes to idling, I can only assume we are talking about hours at a time at a job site, or an emergency vehicle running at the scene etc., not stopping at the store for a drink and leaving the truck running for 3-5 minutes. I tend to agree that wet stacking may not be much of an issue with these modern fuel injection systems and I haven't read much about modern diesels "Making oil" so to speak. My fire department uses a 2011 F350 for a brush truck and we idle it for hours at a time. It only has 3,XXX miles on it and all my time driving it I have not noticed a single regen, nor have we topped off the DEF yet. Would a vehicle like this be in trouble due to long idle times and not a lot of driving time? I'm trying to talk our chief into deleting emissions on it because it is an exempt vehicle, or get it re-flashed at the dealer for manual regens (it's an XL). High idle is an option but all the up fitters are taken up to control lights. Anyway, enough rambling, I'll follow this thread for any input.
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From: Arizona
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Add another switch somewhere for high Idle for the fire truck... Just because you haven't seen a regen doesn't mean it hasn't done one. Unless you read the computer which counts them and it says zero.
What I have noticed is that the truck has a cold temp strategy that also ups the RPMS when the motor is cold - this may help prevent wet stacking in the short run or at least initial start up. Those old 7.3s left idling you'd know it wet stacked if you idled too long. First hit of the go pedal and the amount of soot coming out the back told you so.
I agree with what's already been said. If you have to idle for a long time and often, get the high idle mod. Really try not to do it though. Also, the new trucks come with an idle hour timer, which could potentially be used to deny warranty work if you exceed a certain percentage of running time vs. idle time.
What I have noticed is that the truck has a cold temp strategy that also ups the RPMS when the motor is cold - this may help prevent wet stacking in the short run or at least initial start up. Those old 7.3s left idling you'd know it wet stacked if you idled too long. First hit of the go pedal and the amount of soot coming out the back told you so.
I agree with what's already been said. If you have to idle for a long time and often, get the high idle mod. Really try not to do it though. Also, the new trucks come with an idle hour timer, which could potentially be used to deny warranty work if you exceed a certain percentage of running time vs. idle time.
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