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Coasting in Neutral

Discussion in 'Technical Chat' started by dustinclm, Mar 24, 2011.

  1. Mar 24, 2011 at 6:34 PM
    #1
    dustinclm

    dustinclm [OP] Well-Known Member

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    will it harm anything if you coast to a stop in Neutral with an automatic?
     
  2. Mar 24, 2011 at 6:39 PM
    #2
    Sandhopper

    Sandhopper Well-Known Member

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    Can't imagine this would cause any problems... Just don't forget to put it back in gear when you want to take back off...
     
  3. Mar 24, 2011 at 6:42 PM
    #3
    dustinclm

    dustinclm [OP] Well-Known Member

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    yeah i havernt forgotten yet. i dont think it will hurt anything either but my knowledge is limited. you dont have to hit the break to shift from D to N so i figured it cant hurt. well its a 2001 so its not too modern i guess. i just figured it might save some gas driving to and from school everyday since there are a few stop lights i can coast to from 55mph come to a stop and then go again when grenn
     
  4. Mar 24, 2011 at 6:44 PM
    #4
    ds46000

    ds46000 Well-Known Member

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    shutting off the injectors in neutral? the fuel injectors? why/how would this work? wouldn't the truck stall?

    and if 4 questions wasn't enough...here's another:

    how would shutting off injectors burn more gas?
     
  5. Mar 24, 2011 at 6:48 PM
    #5
    Sandhopper

    Sandhopper Well-Known Member

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    Why would this be illegal? I do it all the time in my manual. What's the differance? If you drop it into N the RMPs do not drop to zero so I doubt the injectors are shut off. If this was the case the truck would stall if you put it in N in the driveway.
     
  6. Mar 24, 2011 at 6:50 PM
    #6
    ink junky

    ink junky I phucking hate people >:(

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    I know OP is talkin bout a 1st gen, but my trucks RPMs are actually a bit higher in neutral (warm or cold engine) than in Drive. So I still figure that if a 2nd gen were to do that it would do no good...mpg wise :confused:
     
  7. Mar 24, 2011 at 6:50 PM
    #7
    dustinclm

    dustinclm [OP] Well-Known Member

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  8. Mar 24, 2011 at 6:53 PM
    #8
    rex99

    rex99 Well-Known Member

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    I don't know why it would be illegal, how would the police know?? I'll shift into neutral for a long red light, or coast up to it if safe and I know it will be a long red.
     
  9. Mar 24, 2011 at 6:53 PM
    #9
    dustinclm

    dustinclm [OP] Well-Known Member

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    i think it idles higher in N, at a stop, than D because the motor doesnt have the load of turning anything
    im just wondering when i see a light that is red and im doing 55mph will i hurt anything or save a little gas from coasting in N than in D
     
  10. Mar 24, 2011 at 6:54 PM
    #10
    Snowman

    Snowman I have a problem for your solution…

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    The rpms are higher because the engine is still turning over a that speed. But since you are going down the the vehicle is working in reverse. It is now using the decline of the road to push it forward turning the wheels which turn the trans which turns the engine and all other items attacted (alternator, ps, a/c, etc) So no gas is being burnt, the decline of the road will become the energy instead of gasoline.
     
  11. Mar 24, 2011 at 6:57 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Coasting in neutral with an auto tranny can cause it to over heat, and possibly burn up.
     
  12. Mar 24, 2011 at 7:00 PM
    #12
    Snowman

    Snowman I have a problem for your solution…

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  13. Mar 24, 2011 at 7:01 PM
    #13
    Sandhopper

    Sandhopper Well-Known Member

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  14. Mar 24, 2011 at 7:03 PM
    #14
    Qjake

    Qjake Just another Masshole

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    Have you been talking to Kingfrogs neighbor again?? :facepalm:
     
  15. Mar 24, 2011 at 7:08 PM
    #15
    BenWA

    BenWA Well-Known Member

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  16. Mar 24, 2011 at 7:08 PM
    #16
    TacoRun

    TacoRun Subd for later..

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    There's a reason why you down shift when coming to a stop. If your coasting to a stop your just using your breaks and not using your transmission. But this would only matter when your pulling heavy cargo. Since we are talking about our tacos is really don't matter.
     
  17. Mar 24, 2011 at 7:11 PM
    #17
    REVHARD25

    REVHARD25 Well-Known Member

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    Don't do this! Just drive normal. Not much reason to do this unless you like to wear out your tranny
     
  18. Mar 24, 2011 at 7:14 PM
    #18
    Snowman

    Snowman I have a problem for your solution…

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    The engine doesnt shut off. The ECU just puts in the required amount of fuel to keep then engine from stalling. So if you are going down a hill the engine is spinning because of the downward slope of the hill. The ECU sees that no fuel is needed to prevent stalling so it cuts the injectors.
    The engine doesnt "shut off" it is simply using gravity as the energy to keep the engine moving instead of gasoline.
     
  19. Mar 24, 2011 at 7:28 PM
    #19
    USFBulls89

    USFBulls89 New Member

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    So NO coasting to a light, wears out tranny and there is very little difference in mpg. What about once stopped at a light then shifting to N because you know it is a long light?
     
  20. Mar 24, 2011 at 7:30 PM
    #20
    Sandhopper

    Sandhopper Well-Known Member

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    Guess if you are desending a hill coasting is illegal in Texas... I do not think this applies to coasting up to a light or intersection...

    Sec. 545.406. COASTING. (a) An operator moving on a downgrade may not coast with the gears or transmission of the vehicle in neutral.
     
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