Engine and maintenance
Shaking at traffic lights: causes of stationary vibration
Shaking at a light requires comparing engine smoothness with vibration transmission into the cabin.
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Guides, articles and problems
Transmission
Jolt when selecting D or R: mounts or transmission?
A jolt when selecting D or R may involve transmission response, mounts and engine operation.
Safety and travel
Burning smell from brakes: causes and when it is dangerous
A burning smell near a wheel after driving may indicate excessive heat or friction; touching the hot disc cannot confirm the cause.
Safety and faults
Petrol smell in the cabin with air conditioning: why?
Ventilation may reveal a smell outside the cabin, so petrol smell with air conditioning does not mean refrigerant or the cabin filter is responsible.
Safety and faults
Petrol smell inside the vehicle: dangerous or normal?
Fuel smell inside the cabin deserves assessment even without a visible puddle.
Safety and faults
Petrol smell after refuelling: is there a leak?
A smell after filling may involve a spill, closure or circuit fault; its association with the station does not establish that it is temporary or safe.
Fuel efficiency
Black exhaust smoke: rich mixture and other causes
Black smoke requires understanding engine type, emissions system and the conditions when it appears.
Routine maintenance
Blue exhaust smoke: burning oil?
Blue smoke may relate to oil entering combustion, but colour alone does not identify the responsible component.
Cooling and air conditioning
White exhaust smoke: when is it dangerous?
Light vapour in cold weather differs from persistent thick white smoke after warm-up.
Cooling and air conditioning
White smoke with a sweet smell: a coolant leak?
Persistent white smoke with an unusual smell and coolant loss increases the need for cooling-system and engine inspection.
Routine maintenance
Engine ticking at startup: what does it mean?
Ticking at initial startup must be distinguished from persistent heavy knocking.
Engine and maintenance
Engine misfires while stationary: possible causes
If the vehicle is stationary, tyre inspection is not the starting point for engine misfiring.