Are you sure you know your car like the back of your hand? Most drivers are limited to basic skills: refueling, checking tire pressure or adding washer fluid. But when it comes to internal structure of the machine, even experienced car owners are at a loss. This test will help you assess your actual level of knowledge - from basic questions about the location of fuses to complex nuances of operation. turbocharger or ADAS systems.
We have collected 50 questions of varying difficulty levels, covering all the key components of the car: engine, transmission, electrician, suspension and body. The test does not require special tools - only your knowledge and honest answers. Ready to test yourself? Let's start with something simple: do you know where in your car the fuse box?
For convenience, we have divided the questions into thematic blocks. After completing each section, you will receive a summary of the answers with explanations. And at the end of the article you will find unique self-assessment table, which will help determine how deeply you understand the structure of the car. Don’t forget: even if you make a mistake, this is a reason to learn something new!
1. Engine: the heart of the car
Let's start with the main thing - internal combustion engine (ICE). This unit converts the thermal energy of burning fuel into mechanical work, but most drivers imagine it as a “black box” under the hood. Let's check how well you know its structure.
First question: what is compression ratio and how does it affect engine power? If you answer that this is the ratio of the volume of the cylinder when the piston is at bottom dead center (BDC) to the volume of the combustion chamber at top dead center (TDC), then you already deserve a plus to your karma. Did you know that in modern turbocharged engines the compression ratio is often belowthan atmospheric ones to avoid detonation?
- 🔧 What is the name of the part that opens and closes the valves in the cylinder head?
- ⚡ What is it lambda probe and where is it installed?
- 💨 Why are there no spark plugs in diesel engines?
- 🔥 What consequences can engine overheating have (list at least 3)?
If you answered all four questions without hesitation, congratulations, you are in the top 10% of car owners! If at least one question causes difficulties, do not be discouraged: even many mechanics confuse camshaft with crankshaft in a hurry. The main thing is to understand the principles of operation, and not to memorize the names of parts.
⚠️ Attention: If your engine begins to “trouble” (vibrate and lose power), never ignore this symptom. Reasons may vary from faulty spark plugs up to problems with fuel injectors or even valve burnout. Diagnosis at an early stage will save you thousands of rubles on repairs.
2. Transmission: how power is transferred to the wheels
A transmission is a complex system that transmits torque from the engine to the wheels. It includes clutch, gearbox, cardan shaft (or drive shafts in front-wheel drive cars), differential and bridges. Even if you don't know how to repair a transmission, basic knowledge will help you avoid costly mistakes.
For example, did you know that in automatic transmission (automatic transmission) Is it possible to tow a car over long distances without hanging the drive wheels? And in robotic gearboxes (type DSG) it is strictly forbidden to hold the car on an incline using the gas pedal - this quickly kills the clutch. Here are some more questions to check:
- 🔄What's the difference? variator (CVT) from a classic automatic machine?
- 🛠️ Why does a manual transmission sometimes “knock out” a gear?
- 💰 Which transmission is the most expensive to repair: automatic transmission, robot or variator?
- 🚗 What is it Quattro all-wheel drive and how does it work?
If you drive a car with Automatic transmission, be sure to check the oil level in the box. Unlike an engine, where you can add oil yourself, in an automatic machine, underfilling or overfilling can lead to torque converter failure or clutches. By the way, did you know that in some models (for example, Toyota Corolla E170) the oil in the automatic transmission is designed for entire service life and does not require replacement? Although in practice this is not always the case.
If your car with a manual transmission begins to “crunch” when changing gears, check the oil level in the gearbox. Often the problem is solved by simply adding transmission fluid.
3. Electrics and electronics: the nervous system of the car
Modern cars are more like computers on wheels than mechanical devices. System CAN buses, control units (ECU), sensors and actuators - all of this requires at least a basic understanding. Let's start with something simple: do you know where in your car the cigarette lighter fuse?
And now the more difficult questions:
- 🔋What is it alternator and how to check its functionality?
- 💡 Why can’t you install lamps of higher power in headlights than prescribed by the manufacturer?
- 📡 How the system works Start-Stop and why does she sometimes refuse to turn off the engine?
- 🔌 What is it body weight and why can its poor contact cause electronics to malfunction?
One of the most common myths is that The battery must be completely discharged before charging. In fact, modern calcium (Ca/Ca) and AGM batteries Not only do they not require a full discharge, but they also react extremely negatively to it. If the voltage drops below 10.5 V, the battery may permanently lose capacity.
⚠️ Attention: If after washing the engine the car stops starting, never panic and do not “turn” the starter for more than 10 seconds in a row. Most likely, water got on ignition coils or candles. Let the car sit for 15-20 minutes with the hood open - the moisture will evaporate and the problem will disappear.
| Symptom | Possible reason | Verification method |
|---|---|---|
| Battery light is on | The generator or timing belt is faulty | Measure the voltage at the battery terminals with the engine running (should be 13.8–14.4 V) |
| Power windows don't work | The fuse is blown or the control unit is faulty | Check fuse F32 (usually 30A) and relay in the block |
| The car stalls while driving | Problems with the crankshaft position sensor (CPS) | Read errors with scanner (code P0335 or P0336) |
| Headlights don't come on | The contacts in the fuse box have oxidized or the lamp has burned out | Check the voltage at the lamp connector with a multimeter |
4. Suspension and steering: comfort and safety
Suspension is not only about comfort, but also security. Worn shock absorbers will increase braking distance by 20-30%, and faulty ball joints can cause you to lose control at speed. Let's check how well you understand this section.
First, answer: what is wheel alignment and why does it need to be done after replacing any suspension elements? And now the more difficult questions:
- 🔨 How are they different? McPherson struts from multi-link suspension?
- 🚘 Why you can’t drive a car with leaky anthers CV joints?
- 🔄 What is it anti-roll bar and how does it affect handling?
- 💥 What signs indicate wear and tear? wheel bearing?
Many drivers are confused shock absorbers and springs. The former dampen vibrations, and the latter support the weight of the car. If the shock absorber “leaks”, the car will sway strongly on uneven surfaces, and if the spring breaks, the body will simply “sag” on one wheel. By the way, did you know that in some cars (for example, Mercedes-Benz S-Class) are used air suspensionthat automatically adjust ground clearance?
Check for play in the steering|Inspect the shock absorbers for leaks|Make sure there are no cracks in the suspension arms|Check tire pressure and tread pattern-->
5. Braking system: your main insurance
Brakes are the only system in a car that will save your life in a critical situation. However, many drivers forget to check their brake pads and rotors until they hear the annoying grinding sound of metal. Let's check how knowledgeable you are about how this system works.
Let's start with the basics: what is ABS and why does it sometimes “cut off” when braking hard on gravel? And now questions for the advanced:
- 🛑 How are they different? disc brakes from drums?
- 🔥 Why can’t you press the brake pedal hard immediately after washing the car?
- 💨 What is it vacuum brake booster and how to check its functionality?
- 🚗 Why do you need to “grind in” them after replacing brake pads?
One of the most dangerous myths is that Brake fluid does not need to be changedif it hasn't become cloudy. In fact, it is hygroscopic (absorbs moisture), and even if it looks normal on the outside, its boiling point can drop to critical levels. 140–150°C (instead of standard 230–260°C). This causes the brakes to “boil” during heavy use.
⚠️ Attention: If the brake pedal becomes soft and falls out, stop immediately and check the brake fluid level. This could be a sign leaks in the system or Master brake cylinder malfunction. Driving in this condition is deadly!
What to do if the brakes fail while driving?
Immediately turn on the hazard warning lights and try to apply the brakes - quickly press and release the pedal several times to build up pressure. If this doesn't help, use the parking brake (but don't pull it hard at high speed!) and try to pull over to the side of the road using engine braking (downshifting).
6. Body and interior: not only aesthetics, but also safety
The body is not only a “wrapper” for the mechanisms, but also passive safety element. Modern cars are designed with deformation zones, which absorb impact energy, protecting passengers. Did you know that in some cars (for example, Volvo XC90) the body is 30% composed of harrow - one of the most durable materials in nature?
Here are some questions on this topic:
- 🔧 Why are they needed? body reinforcements and where are they located?
- 🎨 Why can’t you wash your car immediately after painting?
- 🚪 What is it door stops and why is their breakdown dangerous?
- 🔥 How to properly extinguish a fire in a car?
Many drivers don't know that rust - This is not just a cosmetic defect. Corrosion can weaken the load-bearing elements of the body, which will lead to accident deformation or even suspension separation. “Red” rust is especially dangerous in places of welds and on spars.
The interior also has its pitfalls. For example, did you know that airbags do they have an expiration date? On average it is 10–15 years, after which the squib may not work in a critical situation. Check the sticker on the door pillar - it shows the year the pillow was manufactured.
Regularly inspect the body for chips and scratches. Even a small damage to the paintwork can become a source of corrosion, especially in winter, when the roads are sprinkled with reagents.
7. Diagnosis of faults: learning to “read” the car
The ability to “listen” and “feel” a car is a skill that comes with experience. Extraneous sounds, vibrations or changes in the behavior of the machine often signal the beginning of problems. Let's see if you can recognize the “symptoms” of breakdowns.
Imagine these situations:
- 🔊 The car starts to “squeal” when you turn the steering wheel. What is this?
- 💨 White smoke is coming from under the hood. What does this mean?
- 🚗 When accelerating, a knock is heard from the front. Which nodes need to be checked?
- 💡 The “check” light came on on the dashboard. What actions should I take?
If you heard metallic knock in the suspension, it can be anything: from worn silent blocks up to broken engine mount. But whistle when pressing the gas pedal most often indicates wear alternator belt or rollers. By the way, did you know that in some cars (for example, BMW 5 Series G30) the alternator belt can drive and water pump? If it breaks, the engine may overheat.
One of the most insidious sounds - crunch when turning the steering wheel. This almost always indicates wear and tear. CV joint (grenades). If you do not replace it in time, it may simply “fall apart” on the move, leaving you without drive to one of the wheels.
FAQ: Frequently asked questions about the car
🔧 Why can’t you use water instead of antifreeze?
Water boils at 100°C and freezes at 0°C, while antifreeze can withstand temperatures from -40°C up to +130°C. In addition, water causes corrosion in the cooling system and does not lubricate the pump, which leads to its premature wear.
⚡ Is it possible to drive with the check light on?
If the light bulb Check Engine lights up constantly - you can get to the service center, but do not delay diagnostics. If she flashing is a sign misfireswhich may damage the catalyst. In this case, it is better to stop and call a tow truck.
💨 Why does the car twitch when accelerating?
There may be several reasons: worn spark plugs, clogged fuel injectors, faulty mass air flow sensor (MAF) or problems with turbine. Start with computer diagnostics - it will show errors, if any.
🔋 How to “light” a battery correctly?
Follow the order: donor plus → recipient plus → donor minus → recipient mass (not at the negative terminal!). Start the donor car first, then the recipient. Never light a cigarette while the engine is running - this can damage the electronics.
🚗 What to do if the car doesn’t start?
Check:
1. Battery charge (voltage must be at least 12.4 V).
2. Fuses (especially those responsible for the fuel pump and ignition system).
3. Fuel in the tank (yes, sometimes this is the problem!).
4. Immobilizer (may block starting due to a malfunction in the key chip).