Coasting in neutral harmful?

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Jan 14, 2011 | 11:27 AM
  #31  
Quote: I know it is recommended for some vehicles with automatic transmission not to coast downhill in neutral. With the price of gas going up again, I am tempted to play the coasting game downhills to save on fuel in 2 wd only.

Anybody know if this can be harmful to the transmission?
I own a '97 4.0 w/ auto. Thanks, Henry
i go the same thing in my ranger. its fine
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Jan 14, 2011 | 11:28 AM
  #32  
If you have an automatic, shifting to neutral will save you absolutely no fuel. You may even get better mpg coasting in drive. Theres been many tests done on this just search google. A manual it may gain you some mpg since they don't coast in gear like autos do in drive.

Its a jeep though, the little money you save putting it in neutral (if any) will be needed when your NSS wears out.
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Jan 14, 2011 | 11:29 AM
  #33  
Quote: You're actually HURTING your gas mileage by shifting into neutral.

Here is why:
When you coast in gear, the injectors are shut off.
When you coast in neutral, the injectors have to supply enough fuel to maintain an idle.

Not to mention the damage you can (and will) cause to your transmission syncros switching back and forth while at speed. You also lose the ability to engine brake. There is also the frightening possibility that you might put the transmission in reverse, which would not end well.

As for the transmission fluid pump working in neutral - it does, but only to the torque converter.
i think he means shifting to neutral and stutting it off. thats what i do
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Jan 14, 2011 | 06:22 PM
  #34  
your torque converter seal won't last long when coasting in neutral with the engine shut off. it needs to be running to get lubed.
happened to me when i was trying to get my xj home from wheeling while it was overheating. i thought i would just throw it in neutral and shut it off when it got hot. the temp would drop dramatically upon restart, but only took a few times until it started leaking tranny fluid onto the exhaust, thus covering everyone behind me with a cloudy oily film.
got home and swapped out tranny's and put in a new rad.
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Jan 14, 2011 | 08:18 PM
  #35  
Quote: So, is it scary, or not?
When you're going down a hill backwards with no power and traffic is flying up the hill behind you, yes it's scary. When you just lose power on a regular 1 or 2 lane road and you have somewhere to pull off, then no it's not scary

Going back on topic, I don't think this would hurt your vehicle unless you are shifting form neutral into drive while moving, then I think it might do some damage to your transmission. As for gas consumption, if your RPMs are lower when you are coasting (which they should be) it should then use less gas.
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Jan 14, 2011 | 10:39 PM
  #36  
I kick mine into neutral while rolling to a stop all the time. Not to save gas but to go a little easier on the brakes. Years of driving a manual I guess. I have never had a problem with my AW4.
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Jan 15, 2011 | 09:07 PM
  #37  
Quote: I kick mine into neutral while rolling to a stop all the time. Not to save gas but to go a little easier on the brakes. Years of driving a manual I guess. I have never had a problem with my AW4.
Omg, brake pads are like $30 and last 50000 miles
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Jan 16, 2011 | 12:50 AM
  #38  
Quote:
Omg, brake pads are like $30 and last 50000 miles
Ok, then you send me some new brake pads and I'll keep it in gear.
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Jan 16, 2011 | 01:14 AM
  #39  
I started doing the neutral shift thing last month as a result of seeing that I was getting 12mpg city. I calculate my fuel efficency every time I fill up now and I'm getting about 15-16 city just as a result of coasting in neutral.

There is nothing wrong with doing it and it really does no harm to your AW4. Chrysler actually recommends shifting from drive to neutral when using shift on the fly 4wd. I doubt a manufacturer would tell you to do something harmful to your vehicle lol. So don't be worried, you'll be fine!
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Jan 16, 2011 | 03:43 AM
  #40  
A 25% decrease in fuel consumption seems a little optimistic to me.

Also regarding the rolling in neutral thing... yeah you may go further but 9/10 times you will use your brakes therefore negating any distance advantage you gain from rolling in neutral.
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Jan 16, 2011 | 03:14 PM
  #41  
Quote: Ok, then you send me some new brake pads and I'll keep it in gear.
how would popping it in neutral save the brakes at all? youre going the same speed in 4th as in neutral when you push it out... that makes no sense.
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Jan 17, 2011 | 12:04 AM
  #42  
Quote: Omg, brake pads are like $30 and last 50000 miles
Unless your like my mother who drives way too fast, brakes way too hard, and her brakes only last for about 1200 miles. She also wears them down until her brakes grind and then she not only needs pads but new calipers also. Lesson to be learned from this, when the pads get low change them before you destroy your calipers
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Jan 17, 2011 | 12:30 AM
  #43  
Quote:
Has yours ever just died? 125,000+ miles between my 2.5 and 4.0 and they never died while drifting in neutral (I did it all the time with the manual). Maybe I'm lucky, and of course anything could happen, so I sort of see your point. But getting to the question I don't believe that drifting in neutral creates any direct harm to the tranny, manual or standard.
Mine stalls perodically. Low idle/sensor issue? I'm not sure but yeah mine has stalled while coasting down hills in neutral. No tranny issues from doing that in 70k+ miles. An I always shift into N going into/outta 4wd. Doesn't everyone?
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Jan 17, 2011 | 12:45 AM
  #44  
Quote: Mine stalls perodically. Low idle/sensor issue? I'm not sure but yeah mine has stalled while coasting down hills in neutral. No tranny issues from doing that in 70k+ miles. An I always shift into N going into/outta 4wd. Doesn't everyone?
I don't shift into N before going into/out of 4H, should I? I haven't had any issues yet.
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Jan 17, 2011 | 12:50 AM
  #45  
Quote: I don't shift into N before going into/out of 4H, should I? I haven't had any issues yet.
IMO thats the best way but u can shift into 4hi without shifting into N but I don't. I don't know how I came to the conclusion shifting into N was best??
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