How long to warm up and fuel used? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 02-17-2008, 11:20 AM   #1 (permalink)
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How long to warm up and fuel used?

New to the 7.3 I always warm my trucks up a bit before driving. With the lesser oil / coolant capacity and smaller blocks the gas engines seem to warm up faster. How long is it necessary to warm up a 7.3 at say 20, 30 40 degrees out? Temp gauge never really starts to move until you actually drive it.

Is it wasting fuel warming up? Does a diesel require less fuel to idle than a gas engine?
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Old 02-17-2008, 11:49 AM   #2 (permalink)
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How long to warmup

I might be in the minority but my thinking is to let the needle comeup off the peg. Longer if cold. I am NOT and engineer but what is a good expantion rate for the metals involved to warmup at? There should be enought heat in the engine to provide good heat transfer. And let it sit for 5/ plus minutes before you shut it down this evens out the head temp and cools the turbo to about 300*F.( hopefully)
Fuels the first thing that I thought of when I heard that the Ford had a fuel cooler on them is where is the bypass when it is cold out? Cold is relative to the grade of fuel of the time of the year but still there should be a bypass! Reading up on the GM sites they seem to have problems in some of the areas in the States with fuel gelling?They also have fuel coolers. (Lets not fight about who has the best truck manufacture to figure out common /different problems that perhaps the consummer isn't getting help on when they should because of foot dragging.) Something else reading their info, with the Izusu engine as well sounds like they / some have piston/s hitting the head as well problem?

Fuels apparantly the bio fuel has 6% less energy in it and don't know to much more then that. Always be suspicious?
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Old 02-17-2008, 12:00 PM   #3 (permalink)
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Just fire it up and drive away slowly. I try to keep it below 2,000 rpm until the temp gauge starts to move.
No fuel coolers on a 99.5-2003.
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Old 02-17-2008, 12:13 PM   #4 (permalink)
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As Cool Canuck said. Start and drive easy until the gauge starts to move. I usually wait until the gauge hits the bottom of the operating range before I run it very hard. I have a manual coolant gauge, and at the bottom of the normal range, the coolant is still less than 150*F
There is a fuel heater, but no cooler.
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Old 02-17-2008, 12:26 PM   #5 (permalink)
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Not me, I let mine warm up. Not saying the other guys are wrong, but for MY situation I have a 1 mile trip to the highway where the speed is 65 mph and everybody goes 80.

I use my remote start to fire the truck up. I then go sit down and put my boots on, fill up the coffee cup and walk out the door. My truck has now been warming up for no more than five minutes, and by the time I reach the highway she is ready to roll.

Another major issue if I don't let my truck warm up. The trans cooler by-pass is preventing Over Drive from locking up when its cold. Dana 80 gears and 70 MPH speeds tach the engine Waaaaay more than what I consider safe for my truck. My warm ups in the morning are pretty much a necessity.
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Old 02-17-2008, 02:56 PM   #6 (permalink)
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when i lived in texas (its warm there) i would do as stated above start the truck and drive away slowly, but right now i live in wyoming(going to school) and it get 10-20 below freezing at night so i let m truck so it takes my truck about 15-20 minutes before the temp needle will even move, so mine always get warmed up, also if its that cold and i start the truck and try to drive away it wants to die, so i would say at the very least let it warm up for atleast a few minutes if its really cold out.
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Old 02-17-2008, 05:26 PM   #7 (permalink)
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I'm in the start it up and drive it easy camp. However, one size does not fit all. If had to jump on an interstate I'd probably give it an extra minute or so. I do plug in when below freezing but just for quicker defrost.

I start my truck, get out, unplug, walk to the driveway gates and open them, walk back and scrape the windshield or if necessary broom the snow off. Then, turn the truck around and drive thru the gates, get out and close them. That can take 5 min or so.
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Old 02-17-2008, 07:14 PM   #8 (permalink)
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If you plug it in, you start out with a warm engine. Easier to start, easier on your engine and you can turn on the heater immediately. With my 2002 (sold), I had the remote start. With it plugged in, a minute before leaving, I would activate the remote start, go out and unplug, get in a warm truck and go to work. I've never figured out why so many diesel owners don't plug in when it gets below 25-30 degrees.
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Old 02-17-2008, 08:13 PM   #9 (permalink)
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Quote:
Originally Posted by Pappy19 View Post
If you plug it in, you start out with a warm engine. ...
True, but that's not really the case when I leave work, I hit the road as soon as I can safely see out the windows usually less than 5 minutes. But I'll admit that I'm not immediately jumping onto the interstate, just a few city streets.
Now, the other day the ice at work was on the window thick and hard. It probably ran just shy of 10 minutes before I was able to scrape enough to see out.
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Old 02-18-2008, 11:29 AM   #10 (permalink)
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Adding to my earlier post. I rarely plug my truck in (only twice this winter) I wont plug it in unless the temps fall below 10F, and then I put it on a 4 hour timer.

If I was plugging in my truck every night I would jump in and drive...
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Old 02-18-2008, 12:09 PM   #11 (permalink)
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How many of you folks that warm up their engines have an EGT gauge? With mine, I could sit there for a long time and never see more than 250* on the gauge. The truck would never warm up at that temp. I know where you are coming from, it is really hard on the machine to get on it when cold, all you have to do is listen to it hammering away. If I lived in a cold climate, (I used to but saw the light) I would have a nose cover and plug it in for 3-4 hours on a timer. IMHO, that would be kind to the machine.
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Old 02-18-2008, 08:53 PM   #12 (permalink)
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i can see a little over 300*, when it starts cause it goes to like 1400 rpm right away, but when i get to school and let it sit for a minute or two before going to class it gets as low as 200*
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knn intake
banks exhaust
banks turbo housing
banks power elbo
big head waste gate-disconnected
edge juice w/ attitude (just till i get a DP)
4 gauge pod with DiPricol pyro, boost, trans temp, HPOP

automatic tranny

ranch hand front and rear bumpers

pro comp 2.5 inch leveling kit w/315/75R16
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Old 02-18-2008, 09:08 PM   #13 (permalink)
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I plug my truck in every night and drive away in the morning with heat indicated on the dash gage. I keep the block warm enough to have heat first thing. I aslo added a coolant additive used by the race people to warm the engine up quicker. The stuff works great and has anti corrosive qualities. I use this stuff in both my 7.3 and 5.9 engines to warm them up more effeciently. Summer never requires anything but a start and drive. East coast driver here.

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Old 02-18-2008, 09:09 PM   #14 (permalink)
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Quote:
Originally Posted by Pappy19 View Post
I've never figured out why so many diesel owners don't plug in when it gets below 25-30 degrees.
25-30 is not cold enough to worry about plugging it in.. up here in Canada if its -20c or -4f then I plug it in.. It starts easily to that temp. Other wise it costs a fortune to plug it in.. I have a little deal that shows how much power stuff takes and how much it costs and my block heater + 2 battery warmers cost $2.25/hr to run.
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Old 02-18-2008, 09:49 PM   #15 (permalink)
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Quote:
Originally Posted by Oilfield_Digger View Post
25-30 is not cold enough to worry about plugging it in.. up here in Canada if its -20c or -4f then I plug it in.. It starts easily to that temp. Other wise it costs a fortune to plug it in.. I have a little deal that shows how much power stuff takes and how much it costs and my block heater + 2 battery warmers cost $2.25/hr to run.
Power must be really expensive in Canada or else your battery heaters pull a lot. Here in NY I thought our power was high and it is only about 10-15 cents per hour for the block heater. Even at that I don't leave it on all the time. I don't drive my PSD every day so I plug it into an X10 appliancce module so I can turn it on from the house a few hours before I need it. Plugged a night light into a module with the same code in the house so I have a visiual reminder it is turned on.

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