Questions tagged [car]

A car is a wheeled, self-propelled vehicle. Normally, a car has 4 wheels and is designed for the transport of passengers. Depending upon locale, cars may also be called 'autos.'

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14answers
30k views

Are classic cars safe?

Are classic cars safe? I am interested to know the differences between modern vehicles and vehicles of old from the 1960s. In the event of an accident, how does a classic vehicle compare to a modern ...
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3answers
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If I am just replacing the car engine, do I need to replace the odometer as well?

I am considering getting a new engine for one of my cars and I was wondering if I'll have to change the odometer too. Since the car already has 220,000 miles on it, it would become a huge number if I ...
22
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7answers
7k views

How slow ( not zero) can a car engine run without hurting engine and saving on fuel

New cars have stop-start system (even though this has been available for a long time). My question is: why are car companies emphasizing shutting the engine down at a traffic light, rather than making ...
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2answers
3k views

How exactly does a differential work?

I understand that the differential (or "diff") is the thing that allows the drive shaft to transfer its rotational velocity to the front or rear axle in order to move the car. As far as I know, the ...
20
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2answers
28k views

What is the small metal square attached to the wheel or tire?

I found that this small metal square labelled "1/4 FE" had come off my car's wheel yesterday. I am wondering what it could be, and whether it's important to put it back on.
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6answers
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Why do car starter motors draw so much current?

I understand that most car starter motors' power is rated between 0.5kw to 1.5kw. Doesn't that mean that they are supposed to draw 40-120 amps? (500 w / 12 volts etc.. )? Yet when they start, they ...
19
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6answers
25k views

Adding a additional battery to car

I have purchased a brand new Toyota Innova. I need to install a a mac mini, 2 laptops and make this car a mobile office. I need to know if I can install another car battery in parallel, and will ...
15
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8answers
8k views

Why don't I get shocked constantly?

Noobie question here; NOTE: I don't understand electrics much. If a car's electrical system grounds to the bodywork (usually to the negative terminal) so that the electricity flows through the metal ...
14
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4answers
2k views

Should I fill my tire?

I measured the PSI on my rear driver tire (using a gauge pin - push it into the needle and a stick pops out with a reading), and I got a reading of 22 PSI. My tires are supposed to be anywhere from 30-...
13
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3answers
6k views

Are trims (Hubcaps) on a car tires necessary?

Are there any mechanical / safety issues arise when you do not put trims on car tires? Even when using the car in winter temperatures? (Say -15C to -20C)
13
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1answer
151 views

How much does a driver weigh?

I was amused when I saw one of the statistics for my VW Passat B5.5 car, which stated as follows: Kerb weight with driver - 1425kg I know this is a very weird question and I hope its not too ...
12
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1answer
27k views

How does the tachometer on my dashboard actually work?

Recently, I asked a question about the speedometer, how it works and how accurate it is. But that got me thinking... how does the rest of the dash actually work? I understand that the RPM measurement ...
12
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2answers
509 views

Peculiar Interior Lighting Issue

Recently a friend of mine was driving a VW Fox (not new, I'm not sure what year but it was certainly 5+ years old) home in the dark with the lights on. Strangely, after a minute or two of driving all ...
11
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3answers
2k views

Anyone know what car this is?

What car do you think this is? My guess is new 2017 VW Tiguan. Taken 8 April 2016 in Brisbane , Australia.
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4answers
1k views

What exactly is a catalytic converter and why does it need to operate within a certain range?

I heard here that a catalytic converter needs to operate within a certain "chemical range" otherwise it will generate unnecessary heat. What exactly is a catalytic converter? How does it work? What ...
11
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2answers
4k views

Losing coolant fast after just fixing radiator

I have just got my coolant tank and radiator replaced after a leak in the radiator and a cracked coolant tank. I filled the coolant tank last month and now it is nearly empty. I am just wondering if ...
10
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5answers
11k views

Can cats leave scratch marks on cars?

I live in an apartment complex with some stray cats. I have multiple sets of scratch marks on the side doors of my car. I am unsure if these are from cats or from someone keying my car. Is it possible ...
10
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6answers
273k views

The battery is fine but my car will not start not even a clicking sound

When I turn the key in to start all the lights on the dashboard go out completely and when I turn it back to the off position the dash lights back up. What could the problem be if the battery is okay?
10
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6answers
116k views

Why does my RPM drop when sitting idle at traffic lights?

While I'm sitting idle at traffic lights I put the car into neutral. The engine stays idling at about 1000 RPM. However every now and then it drops down to about 500 RPM and then quickly back up to ...
10
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1answer
177 views

City Jetta Passenger Windows Unresponsive

I have a 2008 VW City Jetta. About a month ago, I had a remote car starter installed - big mistake. Upon installation, all passenger automatic windows were no longer responsive from either the driver ...
9
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4answers
3k views

Dent removal from passenger door

I have a huge dent in my front passenger door from where I was attacked by an elk. This dent has been in the door for probably 12 months as I previously did not care that it was there. Now I would ...
9
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4answers
1k views

What is the most common end of life issue for a car? [closed]

What is the most common end of life issue for a car? Does electrical issues cause end of life most frequently? Maybe transmission? Alternatively cracks in the chassis?
9
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1answer
2k views

What is name of this part in the picture?

Could you guys please tell me the name of the part in red square in English?
9
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1answer
369 views

My feet turn black

I left the pedicure salon, started my car and drove less than 3 miles to pick up something from the store, when I stepped out of my car my feet were black... and I don't meant just from dirt, It ...
9
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1answer
592 views

How often do you need to run a car?

I have a car that is garaged and not used much. How often should I take it out for a drive and for how long each time? I currently get it serviced every 10,000 KM.
8
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5answers
23k views

Viability of using an electric impact driver instead of an air impact wrench

I'm an amateur mechanic, and i'm wondering if i could use an electric impact driver in place of an air driven impact wrench. I don't have a lot of space to use and store an air compressor, so a ...
8
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5answers
1k views

What clues are there to identify real mileage?

This is a bit theoretical question, maybe viable for a wiki. Suppose you want to buy a 10yo car and among available deals you see one with suspiciously low mileage (e.g. 5'000 km). Seller assures you ...
8
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2answers
119k views

What is the purpose of a drive-shaft?

what is a drive-shaft and why we need it in a car? I do get the point of having crankshaft (using Wikipedia) but still confuse with drive-shaft
8
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2answers
2k views

What is the purpose of a microphone placed at rear view mirror?

I just bought a used Chevy Impala 2005 and it has a microphone placed at the rear view mirror and its wire goes inside the hood. I don't know where it goes and I have no idea how to find its purpose. ...
8
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1answer
798 views

How do old cars actually lose horsepower?

I have heard that when a car gets old it slowly but surely loses its horsepower to some degree. For example, I used to drive a 1997 Ford Fiesta with a 1.25L 1242cc engine that supposedly produces a ...
8
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2answers
2k views

Music stops playing when pressing the clutch down

In my car the music of my car radio stops playing almost every time when I press the clutch. It does not always stop, but probably in 80% of the cases. It never stops when I do not press the clutch. ...
8
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1answer
816 views

How come gears don’t normally change in an automatic car?

I know that there is a similar question here, and another one here that asks when an automatic gearbox knows how to change gear, but I want to know exactly how it does that. It was brought to my ...
8
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2answers
28k views

What does it mean to have a stiff first gear?

This problem is a small one and it can only occur with manual cars, but I have been curious to find out more about it for a while now. Sometimes, when the car is attempting to pull away from a ...
8
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3answers
318 views

Can I buy a used car to learn auto repair & DIY?

I am seriously considering learning some auto repair knowledge. I don't want to use my good car as my experimental starter kit. So can I buy a used car somewhere and have it towed home just for the ...
7
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3answers
2k views

Driving on full tank

Should filling up the tank to full capacity be avoided if possible for the fact that it increases the weight of the vehicle which could reduce the fuel efficiency?
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2answers
23k views

What are all the different types of fluid in a car and a short summary of their use?

A fluid is defined as anything that flows, hence for our purposes a gas or a liquid. I know that there is fuel, engine oil, engine coolant and brake fluid. Also air is normally taken in through a ...
7
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6answers
14k views

Why do Diesel engines have a higher compression ratio than gasoline engines?

Are Diesel engines constructed differently, so that they have a higher stroke volume? (longer stroke, smaller combustion chamber etc.) I know the main differences between Diesel and Gasoline engines(...
7
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2answers
500 views

Where is the part of the car that senses the i-key?

My car is maxima 2014. Where is the part that receives the signals from the intelligent key?
7
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1answer
9k views

Why do blinkers of two cars never blink synchronously?

I dont know if I can ask this question here but have been trying to find an answer for this one for a long time. Take three cars of the same make/model/year. With the precision of microseconds, turn ...
7
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2answers
728 views

Cleaning toddler accident from car

A 20 month old toddler vomited milk in my car. The vomit landed on the rear seat and the foot area in front of the seat. I am sure a few drops flew into the rear air con vent. I have only wiped it off ...
7
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1answer
477 views

How to tell if you have a bad clutch?

I drive a 2004 VW Passat B5.5 that I bought used with quite a high mileage so it has therefore had a relatively large amount of usage (at 118k miles). I am curious to know how to tell if the clutch is ...
7
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2answers
280 views

Camshaft problem not sure what needs replacing

I'm Looking for a part name and info on what could have caused the problem. So I have an 03 peugoet 206 1.4 HDI and I lost a cylinder after going though them by disconnecting each injector and can ...
7
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1answer
1k views

Headlight and dome light flickers

My car's headlight and dome light flickers when the car is started, but when the car is already moving light is working fine. Other lights works fine, though I wasn't able to check the tail lights and ...
7
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2answers
151 views

My car is shaking like wave on small bump

I bought a new Maruti S-Scross zeta model 8 months back. After use of 6000 miles, I felt like my car is taking wave especially visible on the rear passenger head. When I show all of them from my car's ...
7
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1answer
352 views

Displacement sensors for car wheel and datasheets

Probably title says it all, but I am on my design work for car suspension and cannot find a good displacement sensor for each of the wheels of the car. I tried to look up for accelerometers, which can ...
7
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2answers
839 views

How do I check my car for damage after hitting a huge pothole?

I live in Michigan where potholes are plentiful. I hit a big one the other day that really jarred my car. I don't see any obvious damage on or around the tires, but I'm not really sure what to look ...
6
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4answers
744 views

Why does the dual motor Tesla have more range?

In the page http://www.teslamotors.com/models if we scroll down we see the several flavors Tesla sells its Model S. It puzzles me why the 85 version has a shorter range than the 85D. The first can ...
6
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2answers
3k views

2004 VW Passat B5 What and Where is the Locking Wheel Nut?

I was asked recently where I keep the "locking wheel nut" on my car. What is this? What does it do? How can I find it on my car? Do I even have/need one?
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5answers
3k views

Is it feasible to use the exhaust heat to warm the engine block?

I have around 4 miles of city driving to get to work every morning and in the winter my car never reaches operating temperature during my short trip. In fact, I am lucky if I get the engine temp above ...
6
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3answers
697 views

Filling the tires with something other than air, to avoid puncture hassles?

I'm asking because: - I've had flat tires four times in two years and it has been very annoying. - The entire family of an acquaintance died when their car tire burst and the car turned turtle on a ...