Fuel efficiency
Exhaust popping: causes of backfire
New exhaust popping may relate to irregular combustion or modifications; do not treat it as a normal sound effect in a vehicle that did not previously do it.
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Coaster
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Liteace
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Guides, articles and problems
Safety and travel
Noisy brakes: squealing, causes and solutions
Brake squeal has multiple possible causes; persistence, a change to grinding or altered stopping determines inspection priority.
Routine maintenance
Timing-chain rattling: when is it dangerous?
Rattling near the timing system needs precise identification; oil condition can affect some tensioners, but sound alone does not prove chain elongation.
Suspension and tires
Control-arm clicking: signs of a faulty arm
Attributing clicking to control arms before inspection may lead to unnecessary replacement.
Engine and maintenance
Accessory-belt squeal: tensioner or damaged belt?
Accessory-belt squeal may involve tension, alignment, contamination or damage to a driven component.
Engine and maintenance
Whistling during acceleration: belt or turbo?
Whistling under acceleration may relate to engine-driven accessories or the intake path and does not establish turbo failure, particularly if the vehicle has no turbo.
Suspension and tires
Squealing as wheels turn: wheel bearing or dragging pads?
Squealing with wheel rotation differs from joint clicking during a turn.
Routine maintenance
Fuel-pump humming: normal or not?
Humming near the tank may be familiar operating noise or a new change.
Suspension and tires
Rough noise from shock absorbers: when should you replace them?
Roughness attributed to shock absorbers may come from their mounts, fasteners or other parts.
Suspension and tires
Suspension knocking over bumps: how do you find the source?
Knocking over bumps can travel through the body, so identifying front or rear is only a start.
Suspension and tires
Rubbing when turning the steering wheel: tyre or bearing?
Rubbing during steering may come from contact around a wheel or a steering or suspension component.
Cooling and air conditioning
Ticking with air conditioning: normal or a fault?
One click as air-conditioning operation changes differs from repeated ticking inside the dashboard or engine bay.