Our general FAQ section provides clear answers to the most common automotive questions that apply to all vehicles, regardless of make or model. From understanding routine maintenance schedules and oil change intervals to learning about warning lights, smog checks, brakes, tires, and general car care tips, this category is designed to help every driver. Whether you’re new to car ownership or just want reliable advice, our general FAQs give you the knowledge to keep your vehicle safe, reliable, and road-ready.
How much does it cost to have a speed limiter fitted? Expect to pay roughly £150–£600 ($180–$750) to fit a speed limiter to a car or light van, £400–£1,200 ($500–$1,500) for heavy trucks and buses including certification, or £12–£30 ($15–$40) per vehicle per month for telematics-based limiting plus a one-off install of £60–£200 ($75–$250). The …
What Is a Starting Engine? A starting engine—often called a “pony engine”—is a small auxiliary engine used to crank and help bring a much larger main engine to life, typically by turning it over and warming its oil and coolant. In modern cars this role is handled by an electric starter motor, but starting engines …
What a Crank Bearing Does—and Why It Matters A crank bearing supports the crank (engine crankshaft or bicycle crank spindle), allowing it to rotate smoothly under heavy load by minimizing friction, maintaining alignment, and managing radial and axial forces; in engines it rides on a pressurized oil film, and in bicycles it rolls on greased …
Which charger has a black and red wire? Most commonly, 12V automotive battery chargers and trickle chargers use black and red wires—red for positive (+) and black for negative (−). Many DC chargers for hobby batteries (like RC LiPo/NiMH chargers), portable jump starters, and solar charge controllers also feature red/black leads, while USB power cables …
How Calipers Measure: A Practical Guide Calipers measure by comparing the distance between two precision-ground surfaces (jaws or a depth blade) to a built-in scale—vernier, dial, or digital—and converting that jaw separation into a numeric value for outside, inside, depth, or step dimensions. In practice, the tool’s slider moves along a beam; the reading system …
How to Tell If Your Car Starter Is Bad If your engine doesn’t crank when you turn the key or press the start button—especially if you hear a single click, repeated rapid clicking without cranking, grinding, or smell electrical smoke—the starter or its solenoid is likely failing rather than the battery. In brief: bright interior …
Plymouth Cars of the 1970s and 1980s: What They Built and How the Lineup Evolved Plymouth’s 1970s lineup ranged from muscle and midsize nameplates like Barracuda, Road Runner, Satellite and Fury to compacts such as Valiant, Duster, Scamp and later Volaré, while the late decade added subcompacts and imports like Horizon, Colt, Arrow and Sapporo; …
Why gas stations tell you not to “top off” the tank Because topping off can damage your car’s evaporative-emissions system, spill fuel, increase pollution, and often doesn’t add usable range, stations advise stopping at the first automatic click. The pump shuts off to leave expansion space and to let vapor-capture systems work; forcing more fuel …
The Role of the Exhaust Expansion Chamber in Two-Stroke Engines An exhaust expansion chamber in a two-stroke engine uses timed pressure waves to improve scavenging and trap the fresh fuel–air charge, significantly boosting torque and power at specific engine speeds while reducing charge loss out the exhaust; it also moderates temperature and noise to a …
Is NOS Hard on an Engine? What Nitrous Really Does to Your Powertrain Yes—nitrous oxide (often called “NOS”) can be hard on an engine if it’s oversized, poorly tuned, or used without safeguards; but when properly sized, fueled, timed, and monitored, it can be as reliable as other power adders within an engine’s mechanical limits. …
Do air-cooled engines need coolant? No—air-cooled engines do not use liquid engine coolant (the water/antifreeze mix found in radiators). They shed heat to the atmosphere via airflow over finned surfaces and with help from engine oil, which also carries away heat. That means there’s no radiator, water pump, or coolant reservoir to service on a …
What Are Taxi Meters Called? They are called taximeters—the device in a cab that calculates the fare based on time and distance. In everyday speech, especially in English-speaking countries, drivers and riders often shorten this to “the meter” or “cab meter,” but the formal term is taximeter. What the Term Means and Where It Comes …
Crankcase Ventilation (PCV) Valve Replacement Cost in 2025 Expect to pay about $50–$250 for a simple PCV valve replacement on most cars, while designs that integrate the PCV system into a valve cover or oil separator typically run $200–$800+, with some European models reaching $600–$1,500. The final price depends on parts design, labor time, and …
How to Tell If Your Torque Converter Solenoid Is Bad You likely have a failing torque converter clutch (TCC) solenoid if your transmission sets codes like P0740–P0744 or P2769–P2771, the engine stalls when you come to a stop, the car won’t “lock up” at highway speeds (higher-than-normal RPM), you feel a shudder around 35–50 mph, …
Why Your Car Smells Like a Dead Animal The most likely cause is an actual carcass—usually a rodent—trapped in the HVAC system (cabin air intake, blower motor, or ducts) or lodged in the engine bay or bumper area. Less commonly, roadkill can be caught in the grille/undercarriage, or a strong sulfur odor from a failing …
What a 2.0-Liter Engine Means A 2.0-liter engine refers to the engine’s total displacement—the combined volume swept by all pistons as they move from top to bottom—equal to about 2,000 cubic centimeters or roughly 122 cubic inches. In practice, it’s a size designation, not a direct measure of power or efficiency, but it often signals …
Where Ignition Coils Are Located Ignition coils are typically mounted directly on top of each spark plug on the engine’s cylinder head (coil-on-plug), or grouped together in a coil pack on or near the engine—often on the valve cover, intake manifold, timing cover, firewall, or a fender; older vehicles may have a single coil on …
Are most oil drain plugs the same size? No—most oil drain plugs are not the same size. While a handful of sizes are common, thread diameter, pitch, and washer type vary by vehicle make, engine, and oil pan design. Always confirm the exact specification in your owner’s manual or parts catalog before buying or installing …
Why Your Car Makes a Whining Sound at the Rear End If you hear a whining from the rear of your car, the most common causes are a worn wheel bearing, differential (final drive) gear or bearing wear, cupped tires, or a noisy fuel pump; the pitch usually changes with vehicle speed and driving load, …
Are Ignition Coils and Spark Plugs the Same Thing? No—ignition coils and spark plugs are different parts that work together. The ignition coil transforms 12-volt battery power into the high voltage needed to create a spark, while the spark plug uses that voltage to ignite the air-fuel mixture inside the engine. Together, they form the …
Which Jumper Cable to Connect First—and Why the Order Matters Yes, it matters: connect the red (positive) clamp to the dead battery’s positive terminal first, then red to the donor battery positive, black (negative) to the donor battery negative, and finally black to an unpainted metal ground on the car with the dead battery—disconnect in …
How a PCV Valve Is Supposed to Work A PCV (Positive Crankcase Ventilation) valve is a one‑way, metered valve that uses engine vacuum to draw blow‑by gases from the crankcase into the intake manifold, adjusting flow with engine load and closing against backfire or boost; this controls crankcase pressure, reduces oil contamination, and cuts emissions. …
How much faster does NOS make you go? Nitrous oxide injection (often called “NOS,” after a popular brand) usually makes a car accelerate much quicker, but it seldom transforms top speed dramatically. A typical 50–150 horsepower “shot” can cut 0–60 mph times by roughly 5–20% and trim a quarter-mile by about 0.5–1.6 seconds if traction …
How Much Does a Brake System Cost in 2025? Expect to pay about $600–$1,600 for pads and rotors on all four wheels in the U.S., while a full brake system overhaul can range from $1,500–$6,000 or more depending on the vehicle, parts, and labor rates. Those figures vary widely by model (economy vs. performance), region, …
Why the 5.7 Is Called a Hemi It’s called a “HEMI” because its cylinder heads trace their design to a hemispherical-style combustion chamber—an architecture that places the intake and exhaust valves on opposite sides of the chamber with a centralized spark location for efficient airflow and combustion. In the modern 5.7-liter V8, the chamber isn’t …
How much does it cost to replace ignition coils in a car Expect to pay about $100–$350 per ignition coil installed in the U.S., depending on the vehicle, parts quality, and labor rates; replacing a full set typically ranges from $250–$800 on 4‑cylinder engines, $350–$1,200 on V6s, and $450–$1,600+ on V8s, with higher costs when …
What Makes a Car a Lowrider A lowrider is defined by a purposefully lowered, usually adjustable suspension—typically via hydraulics or air—combined with distinctive styling (wire wheels, small tires, elaborate paint and interiors) and a cruising-first ethos rooted in Chicano/Mexican American culture. Beyond simply riding low, a true lowrider blends engineering, artistry, and community, often built …
What White Smoke from Your Exhaust Really Means White smoke from the exhaust typically indicates either normal water vapor on a cold start that dissipates quickly, or a coolant leak being burned in the engine—often due to a head-gasket failure—if the smoke is thick, persistent, and sweet-smelling. Less commonly, it can point to issues like …
What Do the Cruise Control Symbols Mean? Most cruise control symbols indicate whether the system is on, set, or experiencing a fault: a speedometer icon or “CRUISE” typically signals basic cruise control, a car with radar waves denotes adaptive cruise control (ACC), “LIM” points to a speed limiter, and color cues (white/gray for standby, green …
Hydroplaning in Cars: What It Is, Why It Happens, and How to Handle It Hydroplaning—also called aquaplaning—is when a car’s tires ride on a thin layer of water instead of the road, causing a temporary loss of steering, braking, and traction. It typically occurs at speed on wet roads with standing water, especially when tires …