Idle time?
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Elder User
Joined: Jan 2006
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From: Fernandina Beach, Florida
Idle time?
I use my truck at work alot and spend time just idle for the a/c, 400 ac. of black pavement is hot! How long can I idle? Seems that I read something here about wet idle or something like that.
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
IMO, let it idle as long as you want. Wet idle (I don't know if that's the correct term, but I know what you're talking aboout) is not a concern. Basically what happens is the cylinders cool off too much and the fuel will no longer fully burn what's in the cylinder, making the inside of it "wet" from fuel. In the heat you're in, it's not going to happen. And, since our cooling system on these trucks does an incredible job from the factory, the truck shouldn't have a problem with overheating. I know building contractors here that never shut their trucks off during the day, and they can be parked for well over an hour at a time.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
Wet Stacking! If you search there's a lot of old info about that. Basically engine cools enough to the point that even at idle it doesn't burn all the fuel, leaving deposits. Over time these deposits build up and can be bad for you.
If you need to idle for a while, get an auxilary idle controller, or a chip with a high idle feature.
If you need to idle for a while, get an auxilary idle controller, or a chip with a high idle feature.
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Elder User
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From: Fernandina Beach, Florida
Originally Posted by Pocket
Wet Stacking! If you search there's a lot of old info about that. Basically engine cools enough to the point that even at idle it doesn't burn all the fuel, leaving deposits. Over time these deposits build up and can be bad for you.
If you need to idle for a while, get an auxilary idle controller, or a chip with a high idle feature.
If you need to idle for a while, get an auxilary idle controller, or a chip with a high idle feature.
Oops, I did not see your last statement about the high idle, good idea.
Gone, but not forgotten
Joined: Oct 2005
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From: Charlotte-Fairbanks-Bflo
I've noticed with my truck that at below 30 degrees f. that my idle creeps up all by itself and will not come back down unless I tap the brake. Is this just my truck doing this, or do all of them do it? I do let mine idle for hours in the winter time because I am sort of an overseer on construction projects and at my old age I am not getting my a$$ out in that weather for very long at one time.
Postmaster
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From: Utah County, UT
Originally Posted by Markadeck
I've noticed with my truck that at below 30 degrees f. that my idle creeps up all by itself and will not come back down unless I tap the brake. Is this just my truck doing this, or do all of them do it? I do let mine idle for hours in the winter time because I am sort of an overseer on construction projects and at my old age I am not getting my a$$ out in that weather for very long at one time.
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From: Reno nv
If you have a manual tranny the high idle increase is really common, seems to be a feature of the pcm to prevent wet stacking.
requirements: parking brake on, cold outside, long idle times.
Also the pcm monitors battery voltage and ups the idle if it isn't high enough.
Gawd I hate it when the truck is smarter than me.
requirements: parking brake on, cold outside, long idle times.
Also the pcm monitors battery voltage and ups the idle if it isn't high enough.
Gawd I hate it when the truck is smarter than me.
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Posting Guru
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Originally Posted by Pocket
If you need to idle for a while, get an auxilary idle controller, or a chip with a high idle feature.
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
Originally Posted by Medic 66
I would recommend the AIC. I have the APCM and that does awesome for me. Summer and winter function both. :-)
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You will not wet stack an electronicly controlled diesel engine. Navistar idle test these engines for 36-48hrs without any problems with decent fuel. Raising the idle helps in the cold weather to maintain engine operating temps, you don't need to worry about that in the summer months. Even if you had to worry about wet stacking, which you don't because you are electronically controlled for a precise fuel metering, raising the idle will not solve the issue/prevent it, as your EGTS are still not hot enough to burn the deposits off.
Post Fiend
Joined: Jul 2005
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From: 21791
you do not need to worry about wet stacking. it only occurs in really cold climates, like up north where they are in the oil fields and they run their trucks to power a PTO generator or just to keep warm inside. in temperatures where the engine meets full operating temperature it will not "wet-stack". usually a sticking valve is a result of wetstacking. then the piston helps it close and that's not good.