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  #1  
Old 10-07-2013, 11:45 AM
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Hi I am new here and I have been doing some reading on improving mpg. I was wondering why is it not recommended to warm up the truck as I do this everyday?
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Old 10-07-2013, 11:57 AM
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Well if you were reading stuff about improving MPG my guess is they're saying you shouldn't let it warm up because then it's just idling wasting fuel. I would definitely argue against that though. I'd rather get slightly less fuel mileage but be nicer to my engine. It will make it last longer with less problems.
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Old 10-07-2013, 01:53 PM
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That is the exact reason I ask. I want to do whatever I can to get the most mpg that I can get however I have always been under the impression that u need to warm up your vehicle and I am sure every vehicle has a different warm up time. I thought you needed this for the motor and tranny to operate properly if not could have big problems down the road. I have never heard of any vehicle not needing a warm up. So if this is the case wouldn't that be bad advice to tell everyone not to warm up thier trucks?
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Old 10-07-2013, 02:10 PM
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You don't necessarily need to let it warm up all the way to operating temperature but it's not a bad idea to let it get at least half way there IMO. It's easier on the combustion chamber, fluids, transmission, everything..... Like I said, I let my vehicle warm up a bit no matter what the weather condition is like. It just makes sense. So yes, I would say it's bad advice telling people not to let their vehicle warm up. But again, they're telling people that because from a MPG point of view it does make more sense. For an engine longevity and maintenance point of view, it does not.
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Old 01-28-2014, 11:09 PM
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Default warm up?

I never warm my truck up. I just drive off slowly for the first couple miles. I have been thinking of adding a block heater so the crankcase would be warmer when starting out in the morning.
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Old 01-29-2014, 07:30 PM
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My son was complaining about the tranny in his 99 Ford Ranger the other day. Saying that it shifted funny for about the first mile or two when it's been cold (say under 20 degrees). So one morning I watched him start his truck. As soon as he had the key turned he was in drive and on his way. After he got home from school I told him to let the truck warm up for 30 seconds to a minute. Next morning...problem solved.

I'm no expert, but I think it would be good to get the fluids circulating before taking off - especially when cold.
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Old 01-31-2014, 02:01 PM
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Warming up a vehicle used to be necessary during the days of carburetors. The warmup time eliminated driveability issues with driving with the chokes engaged. EFI engines do not need to be warmed up prior to driving them. The rule of thumb as has been mentioned is to simply be easy on the engine during the first few minutes. All the "warmup" time I give my vehicles is enough time to insure that the oil is circulating in the system before I leave. This is done pretty much by the time the setbelt is buckled, and tranny is placed into gear. I might let it warm up a bit while I scrape frost or ice off of the windshield as well, just because I'm right by the vehicle, and don't have to worry about someone hopping into it and driving it off.

Now if you get into the car, start it, and mat the motor, YES you are still going to have premature wear. Just take care of your equipment. It will last without having to idle away expensive gas every morning.
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Old 01-31-2014, 04:51 PM
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Warm up is good as it is easy on the engine, but it wastes fuel. Getting on the truck hard when cold is bad for the engine. You should just drive easy for the first couple minutes, this let's the engine warm up (and will actually warm it up faster), and will not waste fuel.
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Old 02-05-2014, 08:15 AM
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There are two schools of thought here, as you can see. In the old days, with carbureted rigs, especially if you had any high performance parts on them, just would not hardly run until you got some heat into the engine. Now days, that isn't the case. You could hit the starter and put it on the floor but I wouldn't.

Consider that all of the oil in the engine is cold and in the pan when you first hit the key. I consider it terrible to throw it in drive half a second after the engine fires up.

The hemi will 'tell' you when it is ready. Notice when you first start it cold, the rpm's at idle jump up to somewhere around 1200, stay there for 5-6 seconds and then begin to drop to normal idle rpm. I let it settle down for 10 seconds or so and then start to drive away. This just gives the engine time to get everything working, oil cycling, computer and sensors are ready, etc...
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Old 02-12-2014, 07:12 PM
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The temperature here in Michigan has been fluctuating any where between 10 above and -20 below lately. I would have to agree with Spike, usually 10-15 seconds the truck idles down and I put her in gear. I do go easy on her the first few miles.
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