What Causes the Engine to Make a Puttering Sound?

[ZoeyAnn]

It could be caused by engine misfire or knocking. Reasons for engine idle vibration and puttering sound: Poor sealing or burning of individual valves. Severe air leakage due to poor sealing of individual valves. Carbon deposits between the valve seat and valve. Insufficient or no clearance in individual valves. In rare cases, vacuum tube detachment in power-assisted vehicles. Reasons for rhythmic puttering sound at various engine speeds: Overly rich air-fuel mixture. Ignition system misfire, severe wear of the distributor cam, contamination in individual distributor holes, leakage in individual high-voltage wires, severe leakage or insufficient gap in individual spark plugs. Mechanical issues such as perforation between individual water jackets and cylinders, water ingress in individual intake valves, poor sealing of piston rings, ring alignment seizure, piston top separation, excessive intake valve clearance, broken valve springs, lost lock pieces, or missing adjustment screws.