High Idle Question?
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
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From: 'Pitlock, Maine
High Idle Question?
I have been reading various posts about High Idle mods on 6.0s here on FTE, I have an 07 6.0 That I have owned since July of this year, and to my knowledge there is no mods done to the idle rpm's.
However I live in Maine and the morning temps are now getting down into the 30s' and I have been noticing the couple of times I have started my truck in the cooler mornings after about 30,maybe 45 seconds the idle rpm's increase without me doing anything and the amount of the increase seems to correlate to the ambient temp. This morning it was the coldest so far that I started the truck and it was also the highest I noticed the rpm to jump up to (1000 rpm on the tach) and when you touch either the brake or the accel. peddle it kicks back to normal???? Sorry about the long intro but my QUESTION is does anyone know of or have they experienced this same thing? is this something programmed onto my truck? or is that even possible? I will say this it for sure is going to a higher idle mode all on it's own. Thanks for any help I get. Mcrafty1
However I live in Maine and the morning temps are now getting down into the 30s' and I have been noticing the couple of times I have started my truck in the cooler mornings after about 30,maybe 45 seconds the idle rpm's increase without me doing anything and the amount of the increase seems to correlate to the ambient temp. This morning it was the coldest so far that I started the truck and it was also the highest I noticed the rpm to jump up to (1000 rpm on the tach) and when you touch either the brake or the accel. peddle it kicks back to normal???? Sorry about the long intro but my QUESTION is does anyone know of or have they experienced this same thing? is this something programmed onto my truck? or is that even possible? I will say this it for sure is going to a higher idle mode all on it's own. Thanks for any help I get. Mcrafty1
Posting Guru
Joined: Feb 2009
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From: Moyock, NC
That is one of the known strategies for Ford programming. It is absolutely normal. My truck has the Mod, but without using it, the truck will perform this function all by itself if sitting idle for a minute. Must have been something the Ford engineers thought was handy so it was built into to flash strategy.
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Fleet Mechanic
Joined: Jul 2013
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From: 'Pitlock, Maine
That is one of the known strategies for Ford programming. It is absolutely normal. My truck has the Mod, but without using it, the truck will perform this function all by itself if sitting idle for a minute. Must have been something the Ford engineers thought was handy so it was built into to flash strategy.
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Joined: Oct 2013
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From: Sandyville Wv
seems nice to have especially during these cold months we experience, i dont shut my truck off at stops 15 minutes or less during these months because i dont want to reboot. seems to have a pretty favorable impact?
Posting Guru
Joined: Feb 2009
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From: Moyock, NC
I assume that the cooler temps play a key factor, although the revs won't go any higher than what you're seeing already.
The purpose for high idle is to avoid a condition called wet stacking. An engine at idle does not create high enough cylinder temps to atomize the entire amount of fuel being injected into each cylinder causing the unburned fuel to mix with, and wash down the oil from the cylinder wall, thus dilluting the engine oil with diesel fuel and causing excessive engine wear. Most manufacurers recomend a minimum of 1,000 rpm for extended or prolonged engine idle periods. When the temps are low enough it will idle up to 1000 rpm after 3 minutes at base idle until you step on the brake.
The purpose for high idle is to avoid a condition called wet stacking. An engine at idle does not create high enough cylinder temps to atomize the entire amount of fuel being injected into each cylinder causing the unburned fuel to mix with, and wash down the oil from the cylinder wall, thus dilluting the engine oil with diesel fuel and causing excessive engine wear. Most manufacurers recomend a minimum of 1,000 rpm for extended or prolonged engine idle periods. When the temps are low enough it will idle up to 1000 rpm after 3 minutes at base idle until you step on the brake.
Posting Guru
Joined: Feb 2009
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From: Moyock, NC
After the truck is warmed to normal operating temps, the factory flash strategy high idle doesn't perform the same, which is why most people do the High Idle Mod to prevent wet stacking. It is also nice to use for PTO operations and if you need to jump start another vehicle.
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Fleet Mechanic
Joined: Jul 2013
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From: 'Pitlock, Maine
After the truck is warmed to normal operating temps, the factory flash strategy high idle doesn't perform the same, which is why most people do the High Idle Mod to prevent wet stacking. It is also nice to use for PTO operations and if you need to jump start another vehicle.
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Cargo Master
Joined: Jun 2007
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From: Roseburg, OR
Mchan or Cheezit mentioned this before and said the increased idle happened below a certain temp. I want to say it was below 50* on the oil temp.
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Fleet Mechanic
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From: 'Pitlock, Maine
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