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Idle gas usage

Discussion in 'General Tundra Discussion' started by Tracker, Feb 2, 2017.

  1. Feb 2, 2017 at 8:27 PM
    #1
    Tracker

    Tracker [OP] New Member

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    So I wanted to discuss the prolonged idle usage of cars in general also in relation to our trucks. I am working some job sites where I use my own car parked for about 8 hours. During the cold and hot weather it will be running the whole time. I have a Pontiac G6 that does well gas wise but my truck is so much more comfortable. I assume the V-8 will suck more gas at idle than a V-6 anyways. Dang lack of active fuel management in the Tundras! So you guys think there's really a significant difference in vehicles burning gas at idle? And what about wear and tear at idle?
     
    Last edited: Feb 2, 2017
  2. Feb 2, 2017 at 8:44 PM
    #2
    Krezz

    Krezz Doesn't want to be new member

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    interested to hear comments on this.
     
  3. Feb 2, 2017 at 8:49 PM
    #3
    T-Rex266

    T-Rex266 Sushi, and Teslas Staff Member

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    You're going to get pro and con opinions here.
    I've let my truck idle for long periods in traffic, or in extreme cold / snowy winters while I shovel the driveway.

    I didn't monitor the mpg on it during that time...but you know where the habits of leaving cars idling come from ;)

    There are a ton of guys that have 300k+ and have let their truck idle for 15+ minutes- parked.

    Some will say you're killing the life of the engine letting it idle for 8-12 hours...others (articles support both parties) will say the opposite.

    Personally I plan on getting another remote start (after market) and start it and not worry about it if needed.
     
    joonbug and Tracker [OP] like this.
  4. Feb 2, 2017 at 8:49 PM
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    joonbug

    joonbug bacon

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    I would never idle any of my cars for even an hour... let alone 8 hours. :confused: Especially when it's hot.
     
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  5. Feb 2, 2017 at 8:59 PM
    #5
    Tracker

    Tracker [OP] New Member

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    Well when its 25 degrees out and I'm sitting in it its gonna need to keep me warm. If you look at police cars they sit at idle for majority of their life time. Usually on a scene or waiting for the speeder. Maintained the crown Vic's converted into taxis have lived in the 300k mile range before.
     
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  6. Feb 2, 2017 at 9:03 PM
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    joonbug

    joonbug bacon

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    Yeah I meant unless you're in 25 degrees weather. :)
     
  7. Feb 2, 2017 at 9:11 PM
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    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    Your transmission might hate you. I would keep a close eye on that temperature, especially if in park.
    When stating up my current truck, after 8 minutes of idle time, the Allison temp is at 150-165*. That might not sound like it is high and it isn't until I tell you where it is at towing 9k at 65-73 mph.

    100-134* is the max I have seen it towing and working hard.

    Point of this, the trans can get hot. Sometimes placing the transmission in neutral with the parking brake on can help.
     
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  8. Feb 2, 2017 at 11:09 PM
    #8
    Tracker

    Tracker [OP] New Member

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    Interesting, I never knew a trans in park doing nothing could get that hot. I wonder why it does. Anyone else seen that as well?
     
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  9. Feb 3, 2017 at 3:02 AM
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    Tundraplatinum

    Tundraplatinum New Member

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    I wouldn't worry about the transmission it is bolted to the engine so heat transfers to it, it doesn't generate heat sitting still. Of course you will be causing wear to the engine since it's running but it's not working so wear will be minimal.if you do let it idle a lot on a regular basis just change your oil more often and don't worry about it.
     
    PRO BLANCO likes this.
  10. Feb 3, 2017 at 7:45 AM
    #10
    Black Wolf

    Black Wolf INCOGNITO undercover toyomafia

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    I think it depends a lot on where you live and what you are doing at the time. In AK during the winter, if working at a outdoor job site, sometimes you are waiting around for long periods. I've seen trucks both gas and diesel left running idle for hours. Got to stay warm.
     
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  11. Feb 3, 2017 at 7:51 AM
    #11
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    Really? A transmission doesn't generate heat sitting still?
     
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  12. Feb 3, 2017 at 8:04 AM
    #12
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    I would have to ask a transmission tech to see how the valve body is set up on the Tundra transmissions. This will determine how hot and how quick they heat up.

    For instance, Dodge transmissions in park would get very hot in Park. The valve body didn't allow for much flow and would spin the torque converter out of fluid and cause excessive heat. The fix to this was this:

    -If idling for extended periods, put vehicle's parking brake on, place transmission in Neutral. This would give adequate flow and cooling to not self destruct.
    -Change or modify the factory valve body in transmission, and even then, a good idea to idle in Neutral.

    Our old work truck was a 2003 Dodge 1500. This poor truck had a lot of extended idle time. It was sent off to auction at 50K miles last year. We had installed 3 sets of injectors, one factory automatic transmission and and one transmission that was supposed to handle more abuse. We were on the third one at 45K miles. The motor was the smallest 4.7L V-8. Power was not tearing these transmissions up. It couldn't pull a greased up rope out of a goats ass.

    My advice, would be to find a scan gauge II and monitor how things are. Toyota makes good products, and the transmissions are very good from my experience. If you do see an elevated temps, try the Neutral and parking brake option.
     
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  13. Feb 3, 2017 at 8:29 AM
    #13
    joonbug

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    I would definitely not run a car at idle for any length of time in the heat to keep an AC on. That I'm sure will hurt your engine. Running the heater in extreme cold is a little better but I would still try to avoid doing that on a regular basis. I would get a small generator and a tiny heater before running my truck just for heat. The problem with people saying it's ok, is how the hell does someone prove it's ok? Are they measuring wear on all the components? There are people saying warming up your car for a few minutes in the cold is bad, how the hell can idling for hours be ok? It's just something difficult to prove either way so I would rather be safe than sorry. Especially with my truck.
     
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  14. Feb 3, 2017 at 8:53 AM
    #14
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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  15. Feb 3, 2017 at 9:42 AM
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    mverkaik

    mverkaik New Member

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    I have a very hard time believing that idling your truck for 8 hours is harmful to the truck other than the wear on the moving components.
    You have a transmission warning indicator that will illuminate if the transmission temperature is out of line. You have a coolant temp gage that will tell you when and if you truck is getting too hot.
    I also have a very hard time believing that the fuel consumption will be all that high at idle. I would guess about 40% more than your G6. The load of the accessories will be about the same. The internal engine friction will be higher as well as the volume of air pumped. I bet you could idle all day for less than a gallon of fuel.
    The Dodge transmission that was referenced earlier has been well noted for being a very bad design.
     
  16. Feb 3, 2017 at 11:25 AM
    #16
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    The Allison transmission was designed in the 70's and has been in production since the mid 80's, and it gets warm sitting at idle. Like stated earlier, it gets hotter than anytime I have towed.

    Will the transmission cook itself over night? No. It is just gradually wearing the transmission prematurely.

    Hell, not sure why I even discuss this stuff. I learn from others misfortunes, and apply it to what I do.
     
  17. Feb 3, 2017 at 12:16 PM
    #17
    mverkaik

    mverkaik New Member

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    We both discuss these things because is it just not in our nature to let it sit. It is a curse :eek:)

    Personally I would have a hard time leaving my car/truck idling all day long. I am way too Dutch for that as well as my desire to minimize cycles on the engine and everything else would override.

    That being said I know a lot of people who do it all the time. I work with a guy who never shuts his car off in the winter. He lets it idle in the parking lot all day because he hate scraping snow and getting in a cold car. His current car has nearly 200k on the odometer (Toyota Camry). He also argues that a cold start causes more wear than running the car all day long.
     
  18. Feb 3, 2017 at 12:56 PM
    #18
    Tracker

    Tracker [OP] New Member

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    We discuss it because thats how we learn and tell others we heard it on the internet :rofl:I never heard of that so now its on my mind and appreciated. I would think it would only put premature wear on the fluid and not the tranny itself. Some more researching might be in order.
     
  19. Feb 3, 2017 at 1:01 PM
    #19
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    Most people keep their vehicles for 4-6 years max. I doubt you would see the long standing results of doing the extended idle problems.
     

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