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Old 11-28-2012, 12:21 PM   #31
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How can you not let it warm up, even a bit. It feels and sounds terrible if you fire it up and start driving immediately. How can you be oblivious to this.

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Old 11-28-2012, 12:37 PM   #32
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As soon as the idle drops and temp gauge moves I'm good, below 30 I give it another min. or 2

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Old 11-28-2012, 01:05 PM   #33
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Its not a conscious act, but if you have a toddler, there is always time to have the Jeep warm up--there's no getting out of my driveway in a hurry. It takes three days to prep up for a weekend away in OBX. A trip to the store requires at least one more excursion into the house for some toy or doll.
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Old 11-28-2012, 01:06 PM   #34
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I've never been worried about letting the engine idle... of course, my last two cars have had remote starts, so my need to have the inside warm assists the engine. Two birds and all that!
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Old 11-28-2012, 01:25 PM   #35
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thank you so much guys for the input! It is great to read the various types of comments from great folks without being bashed to death like it would normally happen in a forum we all know

Thank you so much again
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Old 11-28-2012, 01:33 PM   #36
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Originally Posted by LMT Rubi View Post
thank you so much guys for the input! It is great to read the various types of comments from great folks without being bashed to death like it would normally happen in a forum we all know

Thank you so much again
lolllllllll
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Old 11-28-2012, 01:35 PM   #37
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When I was younger and stupid I used to drive delivery (Ford Pickup) for an auto parts store. When I got cold in the winter I decided to see if warming up was BS or not. I'd get in the truck, start it, and immediately peel out of the place and drove it real hard right away. It didn't last long.
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Old 11-28-2012, 01:37 PM   #38
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When I was younger and stupid I used to drive delivery (Ford Pickup) for an auto parts store. When I got cold in the winter I decided to see if warming up was BS or not. I'd get in the truck, start it, and immediately peel out of the place and drove it real hard right away. It didn't last long.
For real. Ever try to ride a 2-stroke dirt bike after it has just been started? Not happening.
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Old 11-28-2012, 01:46 PM   #39
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So if the engine wants to run hot, whats the best way to heat it up?

Drive it, which shoves more fire through the system faster than idling. Driving (friction) also heats your trans, steering, diff's, brakes, etc. faster than sitting still.

The only reason to idle your Jeep is to defrost the windshield.
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Old 11-28-2012, 04:46 PM   #40
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I start my Jeep from inside the house and it usually warms up for about 5 minutes before I drive off. It uses less fuel then taking off on a cold engine (fuel gauge drops instantly).
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Old 11-28-2012, 04:57 PM   #41
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Quote:
Originally Posted by kik

Under those circumstances I would due to the extreme situation. Under more "normal" cold temps 30 sec. to a minute is enough. Not many see -40 as a steady diet.
This is how I have known it. 30 seconds and you're good. During freezing temps (below 32 F) wait for the idle down and she should be good to go.
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Old 11-28-2012, 05:57 PM   #42
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I just went through the 2012's online owner's manual. Unless I missed it, there was no procedure for "warming" up the wrangler. So I would say no we don't have to warm them up.

There was a note on pg 380 of the 2012 manual that said:

NOTE:
During cold weather, you may experience increased

effort in shifting until the transmission fluid


warms up. This is normal.


and on pg 377:

Extreme Cold Weather (Below –20°F Or –29°C)


To ensure reliable starting at these temperatures, use of

an externally-powered electric engine block heater (available




from your authorized dealer) is recommended.



Also if warm up was required, wouldn't there be a warning light to tell us not to drive until the engine is warm or damage will occur? They could easily program the vehicle to not shift until the optimal temperature is reached.
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Old 11-28-2012, 06:28 PM   #43
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summer day... 30 seconds and im gone [as mentioned, when the idle gets to proper resting rate] ...winter... yeah... she's warming up until she blows warm air.. [3-5 minutes?] especially if there's snow/ice on the windows... but i digress, no warm garage to store her in for the night.
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Old 11-28-2012, 06:48 PM   #44
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I know were all humans here and a Jeep is a mechanical machine but having said that try sleeping outside one night on the ground without a sleeping bag or tent then let someone kick you at 0600 and say "Get up let's go" !

I usually give mine a few minutes to warm up just out of respect I guess.
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Old 11-28-2012, 07:22 PM   #45
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As soon as the idle drops I'm "bat mobile'n" out of my garage!
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Old 11-28-2012, 08:12 PM   #46
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I don't move it until the RPM's drop below 1k. Or when I'm done scraping ice and clearing snow off it. The RPM rule stays true in the summer too. I just never liked to fire it up and instantly put it in gear and drive. In the winter I'm also very easy on it until I hit the highway, by then it's usually at OT and I let her rip!
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Old 11-28-2012, 09:03 PM   #47
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I warm up my jeep for my own personal and selfish reasons.
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Old 11-28-2012, 10:06 PM   #48
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I wait about 2-3 minutes.
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Old 11-28-2012, 10:43 PM   #49
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The reason for engine heaters is not for better performance or anything like that. It is simply to make the engine easier to turn over for the starter motor. The warmer oil is less viscous, and therefore, reduces the amount of torque required for the starter to crank the engine over.

As for an engine wanting to run "hot"...no. The most efficient engine would not heat up at all. Our jeeps are mechanical creations. The engine takes thermal energy (heat in the form of combustion) and expands the gas inside the piston. The piston converts that energy into Mechanical energy that makes our little machines move.

The more compressed a gas is, the hotter it is. As the gas expands, it cools. In a perfect engine (which does not exist, I know), the piston would expand until the hot gas inside of it had cooled back down to the intake temperature, harnessing all of the heat energy.

Every degree that your engine block heats up is one less degree driving that piston, so to speak. So really, you'd want your engine to always be the same temperature as the environment it is running in. We lose about 75% of the potential energy from gasoline in a modern engine. About half of the loss comes from heat escaping. The rest is mostly friction, etc.

There was actually an entirely ceramic engine built back in the 80s. The ceramic, being a much poorer conductor of heat, insulated the process. Only about 10% of energy was lost due to heat loss. The engine was almost twice as efficient. Unfortunately, durability is another story. Ceramic cracks easily.
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Old 11-28-2012, 11:13 PM   #50
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Heres another glaring hole in the "engines are meant to run hot" theory. Why do we have radiators and cooling systems then? Derp.

Like others have said the whole needing to let your engine warm up bit is a false myth that wastes gas.
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Old 11-29-2012, 03:52 AM   #51
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Quote:
Originally Posted by 1quick1

This. And on the 3.6 it doesn't take long.
This, x's infinity
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Old 11-29-2012, 08:48 AM   #52
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I as well grew up being taught to let the engine warm up for just the sake of making your vehicle last a little longer with some extra effort. I have as noticed that if I don't let it warm up for a bit that the shifting of the transmission handles a little worse. Being that the fluid hasn't had a chance to warm up. I do know that when I have friends or family ride with me, they tend to think I am crazy on how I don't just jump in my vehicle and take off. I don't think they enjoy having to sit there for a few minutes as it warms up....LOL
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Old 11-29-2012, 09:33 AM   #53
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Start it up, put in gear and go-slowly and easily at first-don't be abusive but no requirement to sit and idle. You all know your particular climate and wether your vehicle is ready to go. If it stumbles and dies you need to warm, it up if it doesn't just proceed slowly at first.
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Old 11-29-2012, 09:37 AM   #54
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Old 11-29-2012, 10:39 AM   #55
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I sit for about two minutes or so; start the engine, put on my seatbelt, turn on the heater/ac, adjust my iPod playlist accordingly, and then take it really easy on my way out of the neighborhood and until the engine is at normal operating temperature.
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Old 11-29-2012, 10:41 AM   #56
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Since the owner's manual doesn't tell us to do it, it is another myth like running higher than 87 octane (owner's manual recomendation) and 3,000 mile oil changes (normal use).

6 Car Myths That Cost You Money Every Year | Cracked.com

6 car care myths and mistakes - Myth: Wait, it's still warming up (3) - CNNMoney.com

9 Car-Care Myths You Should Ignore - MSN Autos
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Old 11-29-2012, 10:52 AM   #57
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Warm Up

Here in Colorado we let it run long enough for the oil to circulate, about a minute or two.
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Old 11-29-2012, 11:01 AM   #58
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I've owned two cars that both had in the owners manual to start the vehicle and drive away only using part throttle until the oil temperature reached a certain degree. (which I forget what that was now) Not to sit and idle to warm up.

Since I don't have an oil temp gauge, I just use light throttle until the coolant temp is up to normal.
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Old 11-29-2012, 11:24 AM   #59
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It's always better longevity-wise for an engine to have some warm up time vs just driving off. How much warm up time depends on how cold it is and how long the engine sat since last run. While it's OK to just start driving off when cold, the most wear and tear occurs when an engine is first started and driven when cold, so it's best not to drive hard or tow on a cold engine.

The internal engine components (pistons, rings, journals, crankshaft, rods and their accompanying bearings) were designed to fit best at operating temperatures; they all need to heat up and expand for best economy and performance and minimal wear. And, the hotter an engine can run, to a limit, the more efficient it is. The limit is the integrity of the materials and lubricants and a function of thermodynamics of the intake/exhaust/cooling system capacity. Transmissions are affected by temperature in similar fashion. Outside of service neglect, I'd wager the difference between an engine that burns a lot of oil between service intervals and one that doesn't is more often due to running them hard when cold than other factors.
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Old 11-29-2012, 11:31 AM   #60
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BManz:
You are partially correct. You shouldn't drive the vehicle hard while cold but all the other reasons you mention are the reason you should not let it idle. From a car myth article:

As long as you're not flooring it everywhere you go, you can get going as soon as you turn the key. This myth comes from an understandable place: Various engine parts and oil do take some time to warm up before they can operate at full capacity. However, an idling engine takes much longer to warm up, so it ends up experiencing far more cold-start wear and tear than if you just hopped in and drove it.
Think about it: When your engine is idling, it's still producing power, so what difference does it make if that power is being used to move the car or just scratch its shiny metal ass? Additionally, there are other parts of your car that also need warming up, like your transmission and wheel bearings, and those don't get any help until you actually get the thing moving.

Plus, there's another one of your components that needs warming up to function: your catalytic converter. Until that gets up to operating temperature, your emissions are through the roof. Every second you let your car idle in the cold, a single tear freezes to Al Gore's face. And that's only funny the first dozen times or so. Just avoid highway speeds and rapid acceleration for a few miles, and you can drive right off, winter be damned.

Of course, that all applies to newer, fuel-injected cars. If you've got an old carbureted classic out there, you can hang out in the parking lot for a while, if only to let the opposite sex get a good heaping eyeful of you.

6 Car Myths That Cost You Money Every Year | Cracked.com

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