Jaguar XJR backfires and has rough idling after two years of non-use on Jaguar XJR

Some Jaguar XJR owners report experiencing issues such as backfiring and rough idling after their vehicles have been inactive for an extended period, like two years. These problems may stem from stale fuel in the tank, which can disrupt combustion; thus, draining the old fuel and replacing it with fresh fuel is advisable. Additionally, owners may find that fouled or corroded spark plugs affect ignition, necessitating a check and possible replacement to enhance engine performance. A weak or old battery can also struggle to provide adequate power for ignition, so assessing battery health and replacing it if needed is recommended. Furthermore, prolonged inactivity can lead to deterioration or clogging of various engine components, making it beneficial to have a mechanic conduct a thorough inspection. Lastly, a dirty or malfunctioning idle control valve can contribute to rough idling, and cleaning or replacing this component may resolve the issue. To restore optimal performance, owners are encouraged to seek assistance from a Jaguar mechanic or automotive professional for a comprehensive diagnosis and maintenance.