exhaust pops on deceleration · engine backfires
Loud popping or banging sounds from the exhaust, often when letting off the gas or during deceleration, sometimes with a visible flash.
Note whether it happens mainly on deceleration (points to a mixture/valve timing issue) or under acceleration (points more toward ignition or a leak).
Usually safe for a short trip, but get it diagnosed - repeated backfiring can damage the exhaust system or catalytic converter over time.
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Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.
Thick white smoke from the exhaust
SeriousThick, persistent white smoke (often with a sweet smell) coming from the exhaust, especially if it does not go away as the engine warms up.
Blue smoke from the exhaust
WarningA bluish or blue-gray tinted smoke from the exhaust, often accompanied by a burning oil smell.
Black smoke from the exhaust
InfoDark black or sooty smoke coming from the exhaust, usually noticeable when accelerating.
Rattling noise from underneath the car
InfoA metallic rattling or buzzing noise from underneath the car, often changing with engine RPM or road vibration.
