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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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 ...
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2answers
1k 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 ...
16
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5answers
11k 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 ...
13
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4answers
1k 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 ...
12
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1answer
130 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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1answer
82 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 ...
11
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3answers
19k views

What disadvantages a car with 4-speed transmission have compared to 5, 6 or 7 speed with similar engine?

This seemed to be most relevant site to ask my question. I am planning to purchase a new car and my shortlisted car has 4 speed automatic and 1.6 litre engine. The thing that worries me is that it ...
10
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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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6answers
78k 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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3answers
365 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 ...
10
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2answers
65 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 ...
10
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1answer
50 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
votes
1answer
96 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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2answers
60 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 ...
9
votes
3answers
359 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 ...
8
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1answer
510 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?
8
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1answer
91 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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3answers
161 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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2answers
306 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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4answers
393 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 ...
7
votes
3answers
119 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 ...
7
votes
1answer
187 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 ...
7
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2answers
863 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. ...
7
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1answer
69 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
100 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
64 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 ...
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5answers
6k 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 ...
6
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2answers
104 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?
6
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2answers
391 views

How can you optimise the rate at which your electronic devices will charge in the car (fast in-car charging)?

Like many people who use their car regularly, I like to charge my phone when I'm driving so that it isn't flat with I get to wherever I'm going. I know that some computers have a fast charge port ...
6
votes
1answer
65 views

What exactly is meant by the phrase “plugging in your engine”?

I have found a relevant quote from here that might be related: Plugged-in engines are already half-warmed when started. Fuel consumption is thus reduced by an average of 15 per cent over the first ...
6
votes
1answer
1k 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 ...
6
votes
1answer
52 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 ...
6
votes
1answer
94 views

Why is my car so icy in the winter?

The car is a 2004 VW Passat B5.5. The last few days have been colder than usual where I live (below 0 degrees Celsius). The outside of my car has been covered in ice in the mornings and I use a ...
6
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1answer
92 views

What is the effect of the throttle body on the power curve produced by the engine?

I heard from another member of this community that the throttle body, among other things, has the ability to change the power curve of the engine. What exactly is a throttle body? How might the ...
6
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1answer
167 views

Alternative fuel consumption metric to MPG to measure actual engine efficiency?

MPG is all very well and good, considering that most people that are concerned about their fuel consumption tend to want to get as many miles as they can out of it before they need to fill up again. ...
6
votes
1answer
93 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 ...
6
votes
1answer
148 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 ...
6
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0answers
158 views

Permanent car camera secuity system? [closed]

I am getting a new VW and from past experience I want to have a camera system built in the car for few reasons. First, to record any possible accidents while driving and while I am not there. Second ...
5
votes
2answers
115 views

How does the speedometer on my dash actually work?

So pretty much everyone knows what a speedometer is, the thing on your dash that tells you how fast you are going, whether or not you're speeding, and what speed you have the cruise control set to ...
5
votes
2answers
117 views

Multimeter to check car battery current

short background, my car battery will often be too flat to start the car if I don't use it for about 48 hours. Worst it happened the other day after leaving it at airport car park for 4 days and come ...
5
votes
1answer
80 views

What are slip rings with respect to a cars alternator?

This is not a physics forum, and as such I don't expect answers to explain Faraday's law of induced emf (electromotive force), which is the basic physics principle behind how an alternator is able to ...
5
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3answers
3k views

Does only traveling short distances hurt my car?

I have an 04 Corolla that travels < 1 mile twice a day. Is this bad for the car? Reading online, I get a lot of mixed answers, so I'm hoping for definitive answer. In freezing temperatures, I ...
5
votes
1answer
110 views

How to apply brakes so there is minimal wear and tear?

I am looking to conserve energy and increase brake pad life in the following scenario - Say I need to stop 500 meters from where I am at. Assume I am a very aware and an expert driver and that there ...
5
votes
0answers
105 views

Car Audio wiring

BMW E46 Android head unit A little context: I have a head unit, that I want to have constant power through ACC. Basically, it's an android tablet customized for my car, but the manufacturer ...
4
votes
3answers
4k views

Does a wider tire always mean more grip/traction

Recently, i had a discussion with someone about tire width. I claimed, that with bigger (wider) tires, a car would have more traction/grip. The person i was discussing this with, agreed with me, up to ...
4
votes
2answers
49 views

Petrol to CNG converted cars

Please excuse if posted at wrong place. Does running car on CNG wears out engine? I am planning to buy used CNG car (India) but many mechanic advise against it for any CNG car than has run more than ...
4
votes
2answers
107 views

What is wrong with my car?

My car had a broken piston, and broke down completely. I bought a new engine, and had it installed. everything seemed to be working aside from a low clicking sound when driving coming from the engine. ...
4
votes
3answers
432 views

How often should you get your air conditioner checked and serviced?

Every year I bring my car (now almost 3 years old) to the garage for a check up. When I bring it the people from the garage usually ask if I also want the extra air conditioner check and servicing. ...
4
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2answers
80 views

2004 VW Passat B5.5 - Why are my wing mirrors being weird?

Today whilst I was trying to park my 2004 VW Passat B5.5, I noticed that something to do with my wing mirrors wasn't working quite right. When the toggle was on the left position, the left wing mirror ...
4
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1answer
114 views

Cam Belt vs Belt Drive vs Serpentine Belt vs Fan Belt vs V Belt vs Timing Belt

I have a 2004 VW Passat B5 and having started to learn a bit more about engine theory, I was wondering how many belts I have and what names each of the belts have. So, I have a two part question: ...