Ignition & Fuel Delivery - Noises & Vibration Symptoms
Common symptoms and diagnostic guides.
Car shakes weird on cool days
A car that shakes or vibrates on cool days often has a cold?start rough idle caused by ignition, fuel, or sensor issues; symptoms usually ease as the engine warms up.
Car shakes when stopped on hot days
A car shaking when stopped on hot days typically indicates a rough idle caused by engine misfires, vacuum/air?fuel imbalance, or weakened mounts; heat can exacerbate sensor and idle control issues.