PROBLEMS — VIBRATION
Car vibrating when idling?
A rough or shaking idle — especially at traffic lights with the aircon on — is a common complaint in Singapore.
Common causes
01
Worn engine mounts
Mounts that no longer absorb vibration transmit it into the cabin.
02
Misfire
Ignition coils, spark plugs or injectors not working evenly across cylinders.
03
Air & vacuum leaks
Unmetered air upsets the mixture at idle.
04
Dirty throttle body
Carbon build-up can make idle unstable.
Questions owners ask
- Why is it worse with the aircon on?
- The compressor adds load at idle, which exposes weak mounts or a marginal misfire.