Skip to main content
25 votes
Accepted

Does a Car Keep Moving If Neither Accelerator, Nor Brake Is Pressed?

In short, find a better driving instructor and, if possible, learn to drive a car with manual transmission. The long (still simplified) answer: Does the accelerator control and ensure gas is flowing ...
fraxinus's user avatar
  • 2,082
24 votes
Accepted

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

Traditionally... The major drawbacks of automatic transmissions were: parasitic losses in the torque converter, something which manual transmissions don't have. fewer gears, so a given engine was ...
Zaid's user avatar
  • 39.2k
21 votes

Why is towing a manual transmission car, in neutral, with the drive wheels on the ground, considered safe?

Manual transmissions (most, but not all) lubricate not through a pump, but through the action of the gears and secondarily through the level of the transmission fluid itself. In some transmissions, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
20 votes

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

A lot of new automatic transmissions (e.g. Volkswagen DSG) arent actually auto transmissions, at least not in the traditional sense. They have a normal computer-controlled dry clutch (well two ...
MadMarky's user avatar
  • 1,350
15 votes

What are the "1" and "2" or "L" gears used for on an automatic?

To go down hill By setting L (or 1 or 2), the gear will stay low and you will be able to use engine brake, instead of using brakes all the way down the hill and suffering from fading. The ...
Gabriel Diego's user avatar
15 votes
Accepted

How exactly does Sport Mode work in an automatic Subaru Outback?

Sport mode will "increase pickup" by providing a more instantaneous response to throttle inputs. As akadian mentioned, the car will stay in lower gears as you accelerate, allowing the engine to stay ...
MooseLucifer's user avatar
  • 6,007
14 votes
Accepted

Does putting an automatic car into neutral at stop lights significantly harm the transmission?

No. Not by any significant or even measurable amount. Constantly using the shifter may, over time, wear the bushes and linkages prematurely but these parts are usually inexpensive and simple to ...
Sam's user avatar
  • 1,698
14 votes

Why do you use the "park" gear to park a car and not only the handbrake?

Putting the transmission into "Park" engages the "parking pawl" - essentially a metal pin that locks the output shaft of transmission (and thus the driven wheels) in place. As to why it exists - it ...
motosubatsu's user avatar
  • 10.1k
12 votes
Accepted

Do Manual transmission cars perform better than Automatic transmission?

The difference comes down to the driver. While automatic racing gearboxes can beat a driver when it comes to performance, for the type of vehicle you describe, a manual can perform significantly ...
Rory Alsop's user avatar
  • 18.6k
12 votes
Accepted

Why is the ATF Level checked with the engine running?

There are two main things about tranny fluid: Transmission fluid is checked when it's hot (up to running temperature). As the fluid gets up to temperature it expands. If the fluid is cold, it won't ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
12 votes
Accepted

Found a 10 mm nut in the transmission fluid

Okay. Lot's of research, long story, found the answer, don't like it. Overall design of the Nissan B13: one of the things that always impressed me about this vehicle is that it seems to have been ...
tlhIngan's user avatar
  • 12.2k
11 votes
Accepted

Mysterious "5th" Gear on a 4-Speed Automatic?

The transmission has a lock up torque converter. The torque converter sits between the engine and transmission. It is kind of like a clutch on a manual transmission car. When the engine is idle, it ...
rpmerf's user avatar
  • 8,403
11 votes

Does a Car Keep Moving If Neither Accelerator, Nor Brake Is Pressed?

Note, most of these answers are very specific to an automatic transmission and also a gasoline (petrol) engine - The position of the throttle generally controls the volume of air allowed to enter the ...
HandyHowie's user avatar
  • 25.4k
10 votes

1996 Mustang GT won't start with shifter in Park, but will start in Neutral

The range switch doesn't think the car is in park. On Fords theres an adjustable cable if you look on the driver side of the transmission there will be lever with a cable attached. Sometimes the clip ...
Ben's user avatar
  • 10.7k
10 votes
Accepted

How Does a Quick Shifter work in a motorcycle

Why the Quick-Shifter? Since these are called quick-shifters we'll dub slow-shifting the traditional way of shifting gear. When you slow-shift you usually close the throttle, disengage the clutch, ...
JoErNanO's user avatar
  • 1,765
10 votes
Accepted

Bump on the floor in the back of sedans

The hump provides longitudinal rigidity in the unibody. The fact that it also provides a place to route the exhaust is a bonus. Notice that modern CAD-designed vehicles have much less of an obvious ...
dotancohen's user avatar
  • 1,723
10 votes

Switch from N to D without brake

Should be no problem at all. The manual is being overly cautious, since the usual case for shifting from neutral into drive is when you're stopped hold the brake will prevent the car from starting to ...
dlu's user avatar
  • 14.5k
9 votes

Why doesn't anyone ever repair an automatic transmission?

I know that this is an old question, but I want to provide a brief answer. Amount of work that is necessary to fix anything inside the transmission is very close to the amount of work that is ...
Dmytro Zakharov's user avatar
9 votes

What are the "1" and "2" or "L" gears used for on an automatic?

Two additional uses alongside engine braking controlling downhill descents: Low gear, high revs uphill on loose ground like sand If you need to go up a steep hill on loose terrain like a sandy dirty ...
user56reinstatemonica8's user avatar
9 votes

Looking at buying a 1997 Toyota Camry XLE V6 with dark colored ATF, mistake?

95% chance it's just normal wear. The vast majority of car manufacturers recommend an ATF change between 30,000 and 100,000 miles. So if the owner hasn't serviced it in a bit, the brown colour would ...
anonymous2's user avatar
  • 5,235
9 votes

Would not allowing my vehicle to downshift uphill be fuel efficient?

The primary reason to down shift is more power. The 2 things effecting your gas mileage here are throttle position and RPM. As long as you can stay in 8th at less than half throttle, I would stay ...
rpmerf's user avatar
  • 8,403
9 votes
Accepted

Switch from N to D without brake

No harm done On contemporary vehicles there is no direct mechanical linkage between the gear selector and the automatic transmission. Instead, the gear selector selects a "state" (e.g. N, D, R, 1, 2....
Zaid's user avatar
  • 39.2k
9 votes
Accepted

Chevrolet 2008 Suburban, I removed the transmission fluid pan by mistake. Can I just put it back on and refill fluid?

While it's inconvenient, there's no reason you can't resolve this yourself. The transmission fluid pan has a single-use gasket on it, if you just bolt it back on you run the risk of fluid leaks, which ...
GdD's user avatar
  • 17k
8 votes

Bump on the floor in the back of sedans

Anyone can feel free to disagree with me since I'm not 100% on this, but I believe those bumps are placed into the design in order to give the exhaust system a little more breathing room. Note the ...
Dalton D's user avatar
  • 1,958
8 votes

Bump on the floor in the back of sedans

I don't think the hump is there just for the exhaust, although as was pointed out in the comment it adds ground clearance which is a nice thing. The "transmission hump" (in honor of rear wheel drive ...
dlu's user avatar
  • 14.5k
8 votes
Accepted

Would not allowing my vehicle to downshift uphill be fuel efficient?

The power output of an engine is determined by how fast it can capture the energy released from fuel. There is an optimal range for that fuel-to-torque conversion, before and after which efficiency ...
ChangeMachine's user avatar
8 votes

Why is towing a manual transmission car, in neutral, with the drive wheels on the ground, considered safe?

Because, in a manual gearbox (those that I am aware of) the method of lubrication is by splash as the layshaft sits in the oil, so there is no engine driven pump connected to the input shaft. Same ...
Solar Mike's user avatar
  • 34.6k
7 votes

Does putting an automatic car into neutral at stop lights significantly harm the transmission?

It shouldn't as stated above, but there are bushings and bearings that will get worn out, its probably better to just leave it in gear. Engineering Explained did a good review on this, so I recommend ...
user1860175's user avatar
7 votes

Does putting an automatic car into neutral at stop lights significantly harm the transmission?

It could be argued that by putting the car in Park or Neutral, you are saving wear on the torque converter, which can be an expensive piece of equipment to replace. But I can't site any first-hand ...
Matt's user avatar
  • 71
7 votes

What are the "1" and "2" or "L" gears used for on an automatic?

The only time I've ever felt the need to use anything other than 'D' in an automatic is when towing or climbing a steep grade. That's not to say I don't play around like it's a stick shift sometimes, ...
MooseLucifer's user avatar
  • 6,007

Only top scored, non community-wiki answers of a minimum length are eligible