Fast Idle
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Senior User
Joined: Jul 2007
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From: North Georgia
Fast Idle
Has anyone noticed that their truck idles a little too fast? I don't even have to press on the accelerator to back-up and out of my driveway, and it's a little bit uphill. (2012 Screw, 4X4 Ecoboost, 3.73) It goes into the shop in the morning for the modification to the intercooer (I think?) and a reflash of the computer. 
Cargo Master
Joined: Apr 2007
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The engine doesn't make much torque at idle. Needs turbos to spool up before the fun begins.
One thing that might explain it is if the torque converter is tighter with the Ecoboost engine than the other engines. Not sure what is the converter specifications. Anybody know?
One thing that might explain it is if the torque converter is tighter with the Ecoboost engine than the other engines. Not sure what is the converter specifications. Anybody know?
Cargo Master
Joined: Nov 2011
Posts: 2,946
Likes: 11
From: Northern California
The engine doesn't make much torque at idle. Needs turbos to spool up before the fun begins.
One thing that might explain it is if the torque converter is tighter with the Ecoboost engine than the other engines. Not sure what is the converter specifications. Anybody know?
One thing that might explain it is if the torque converter is tighter with the Ecoboost engine than the other engines. Not sure what is the converter specifications. Anybody know?
EcoBoost
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Senior User
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From: North Georgia
My dealership performed the latest TSB today, partly in response to my questions about the fast idle, and a real hard shift from second to third gear. It included an air deflector and a reflash of the computer. The truck will still move forward or in reverse without giving it any throttle, but the shift has really smoothed-out. 
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Cargo Master
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Torque converters slip. If he could pull out that boat at 650 RPM then the torque converter had to be really tight to keep the engine speed down while applying some throttle. That might explain why these trucks pull into the brakes more than usual.
Cargo Master
Joined: Nov 2011
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From: Northern California
It's an impressive video any way you look at it, but I guarantee he had it in 4-low to do that. If the truck had that kind of torque at idle in high range then you'd be doing double duty every day to keep the front of your truck off the back of the car in front of you.
Torque converters slip. If he could pull out that boat at 650 RPM then the torque converter had to be really tight to keep the engine speed down while applying some throttle. That might explain why these trucks pull into the brakes more than usual.
Torque converters slip. If he could pull out that boat at 650 RPM then the torque converter had to be really tight to keep the engine speed down while applying some throttle. That might explain why these trucks pull into the brakes more than usual.
)
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so ... i'm a total number nerd ... and i actually have a spreadsheet for this sort of thing...
If you watch the video, it is pulling out at 650 rpm and 2mph. I also see the Max Tow mirrors, which would be 3.73 gears.
i plugged in stock tires, 3.73 rear, 2.67 4-low, and 4.17 1st gear.
with those numbers, 1.5mph (which would round up to 2mph on the scangauge) figgures right at 650rpm (give or take a lil' bit)
without the low gear in the transfer case, 650 rpm is 5mph or more, so i am almost 100% sure that video was taken in 4 low .... I can't imagine that the boat wouldnt pull the truck down the ramp at idle speed unless it was in low.
If you watch the video, it is pulling out at 650 rpm and 2mph. I also see the Max Tow mirrors, which would be 3.73 gears.
i plugged in stock tires, 3.73 rear, 2.67 4-low, and 4.17 1st gear.
with those numbers, 1.5mph (which would round up to 2mph on the scangauge) figgures right at 650rpm (give or take a lil' bit)
without the low gear in the transfer case, 650 rpm is 5mph or more, so i am almost 100% sure that video was taken in 4 low .... I can't imagine that the boat wouldnt pull the truck down the ramp at idle speed unless it was in low.
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