15 Degree Fahrenheit Start - VIDEO
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Post Fiend
Joined: Apr 2004
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From: North of Salt Lake City
15 Degree Fahrenheit Start - VIDEO
I recorded a cold start to check for noises or any different behaviors from the engine. Here's what I found:
YouTube - 2011 Ford Super Duty 6.7L Diesel Cold Start
YouTube - 2011 Ford Super Duty 6.7L Diesel Cold Start
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Post Fiend
Joined: Apr 2004
Posts: 5,158
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From: North of Salt Lake City
Kind of tugs at the UPS heart strings... lol.
Seriously though, there was absolutely no difference in engine tone or behavior at those temps. Wondering if previous diesels would have reacted in some way to the cold morning.
Seriously though, there was absolutely no difference in engine tone or behavior at those temps. Wondering if previous diesels would have reacted in some way to the cold morning.
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From: Isanti, MN
I would like to add that the glow plugs are used for virtually all starts, including the one we just watched. The glow plugs on this truck take a VERY short time to reach peak temperature, which is why the light only stayed on for a brief time. Takes 2 seconds for these plugs to hit peak temp of over 2,200 degrees!
I have done several cold starts with mine, down to about 5 degrees so far. The engine doesn't misfire or run rough, but it is noticeably louder when it's this cold. Below ~12° the engine immediately idles up to 1200 RPMs to warm up. It then drops down to normal idle before the transmission engages in Drive.
I have done several cold starts with mine, down to about 5 degrees so far. The engine doesn't misfire or run rough, but it is noticeably louder when it's this cold. Below ~12° the engine immediately idles up to 1200 RPMs to warm up. It then drops down to normal idle before the transmission engages in Drive.
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Thanks for another great vid Epic.
Lead Driver
Joined: Jan 2010
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I started mine at 32 after sitting 58 hours this past weekend through a 27 degree night or two and it started right up. Yea yea, I don't want to hear how 27 isn't cold...lol.
What's weird though is three miles down the road, the dang thing started a regen (I saw cleaning exaust filter). The DPF couldn't have been that hot yet?
It had a 300 mile interstate trip on the previous drive to regen and it decided to wait until it's cold with a 15-20 mile drive. Sometimes I just don't understand it.
What's weird though is three miles down the road, the dang thing started a regen (I saw cleaning exaust filter). The DPF couldn't have been that hot yet?
It had a 300 mile interstate trip on the previous drive to regen and it decided to wait until it's cold with a 15-20 mile drive. Sometimes I just don't understand it.
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Post Fiend
Joined: Apr 2004
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From: North of Salt Lake City
I would like to add that the glow plugs are used for virtually all starts, including the one we just watched. The glow plugs on this truck take a VERY short time to reach peak temperature, which is why the light only stayed on for a brief time. Takes 2 seconds for these plugs to hit peak temp of over 2,200 degrees!
I have done several cold starts with mine, down to about 5 degrees so far. The engine doesn't misfire or run rough, but it is noticeably louder when it's this cold. Below ~12° the engine immediately idles up to 1200 RPMs to warm up. It then drops down to normal idle before the transmission engages in Drive.
I have done several cold starts with mine, down to about 5 degrees so far. The engine doesn't misfire or run rough, but it is noticeably louder when it's this cold. Below ~12° the engine immediately idles up to 1200 RPMs to warm up. It then drops down to normal idle before the transmission engages in Drive.
Postmaster
Joined: Sep 2006
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From: Maryland
If you want to truly know if the glow plugs are on or not, use a volt meter. You may be surprised at what you see. Most glow plug applications stay active long after the indicator light goes out. I'm saying that's how these work because I haven't checked on it, but don't be surprised if your volts stay down around 11.4 for over a minute after a cold start like that one. Watching the volt meter you can tell exactly when they turn off as the volts will quickly move from 11.4 to 13.5-14.2 range. Of course if you have Rapid Heat, that really complicates things.
Postmaster
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If the ECT is below 140°F (60°C), the GPCM energizes the glow plugs immediately after the key is placed in the ON position. The on-time is controlled by the GPCM and functions on the basis of the engine RPM, engine torque, engine coolant temperature, air temperature, BARO sensor and battery voltage. The primary ones are battery voltage and the engine coolant temperature.
Additional tidbits...
The GPCM provides battery voltage for approximately 2 seconds to rush current and heat up the glow plugs, then drop back to 7 volts lowering the amperage.
The glow plugs can operate up to 20 minutes.
The glow plugs may turn back on at cold ambient extended idle.
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Joined: Aug 2003
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From: Isanti, MN
Crazy - you got me thinking about the glow plug operation. I do not think the glow plugs fire all the time but in certain circumstances that I cannot find at the moment. The other two sections in the coffee table book (below) refer to the GPCM (glow plug control module) receiving a signal to fire from the PCM "when required". Perhaps PowerStrokeHD can provide the exact criteria in which the PCM will signal the GPCM to heat the plugs up?
Originally Posted by 720deere
If you want to truly know if the glow plugs are on or not, use a volt meter. You may be surprised at what you see. Most glow plug applications stay active long after the indicator light goes out. I'm saying that's how these work because I haven't checked on it, but don't be surprised if your volts stay down around 11.4 for over a minute after a cold start like that one. Watching the volt meter you can tell exactly when they turn off as the volts will quickly move from 11.4 to 13.5-14.2 range. Of course if you have Rapid Heat, that really complicates things.
I would see reduced voltage down to around 12.4 volts after each and every start, regardless of temperature. How long it lasted depended on temperature, but even in relatively warm conditions(60°+) the glow plugs would be active for at least 20-30 seconds after engine start.
I have no way to monitor this with the new truck because this one has the Rapid Heat system.
Here's something else to look at. When you do a cold start(EOT below ~150°) you notice the glow plug "wait to start" light comes on for a second or two before engine start. Next time you do a warm start (above ~150°) look for the light. Mine doesn't come on at all during warm starts.
To me this indicates that unless the engine is warm, the glow plugs will fire.
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What's weird though is three miles down the road, the dang thing started a regen (I saw cleaning exaust filter). The DPF couldn't have been that hot yet?
It had a 300 mile interstate trip on the previous drive to regen and it decided to wait until it's cold with a 15-20 mile drive. Sometimes I just don't understand it.
It had a 300 mile interstate trip on the previous drive to regen and it decided to wait until it's cold with a 15-20 mile drive. Sometimes I just don't understand it.