* Which side: Are you asking about the driver's side or the passenger's side of the engine?
* "1 cylinder" is unclear: Do you mean the first cylinder from the front of the engine, or the cylinder that's closest to the driver/passenger side?
Please provide me with more details so I can give you an accurate answer.
Instead of trying to diagnose engine problems yourself, it's always best to consult a qualified mechanic. They have the knowledge and tools to properly identify and address any issues.