Performance Issues:
* Rough idling: The engine shakes or vibrates excessively when at idle.
* Stalling: The engine unexpectedly cuts out, especially at idle or low speeds.
* Hesitation or sputtering: The engine hesitates or sputters when accelerating.
* Poor acceleration: The car takes longer to accelerate than usual.
* Decreased fuel economy: You're getting significantly fewer miles per gallon than you used to.
* Misfires: (This can be accompanied by a check engine light) The engine is misfiring, meaning one or more cylinders aren't firing properly. This can cause a rough running engine, decreased power and potentially damage to the catalytic converter.
Other Indicators:
* Check Engine Light: This is your car's way of telling you something is wrong. It doesn't automatically mean a tune-up, but it often indicates a problem that could be addressed as part of a tune-up. Get the code scanned to diagnose the issue.
* Spark plug wires showing signs of wear: Cracked, brittle, or frayed wires indicate a need for replacement.
* Dirty air filter: A visibly dirty air filter restricts airflow to the engine, affecting performance.
* Old or worn spark plugs: Spark plugs should be inspected regularly and replaced according to manufacturer recommendations. They can become worn, fouled, or corroded.
What a Tune-Up Might Involve (depending on your car's age and mileage):
* Replacing spark plugs and wires: This is a key component of a tune-up.
* Replacing the air filter: A relatively inexpensive and easy maintenance item.
* Replacing the fuel filter: This is less frequently replaced than other tune-up items.
* Checking and adjusting ignition timing (if applicable): This is less common on newer vehicles with electronic ignition systems.
* Cleaning or replacing the PCV valve: Improper functioning affects engine breathing.
* Inspecting and cleaning or replacing other components as needed: This might include the distributor cap and rotor (on older models), throttle body, etc.
Important Note: A "tune-up" isn't a standardized procedure anymore like it was in the carburetor era. Modern vehicles have sophisticated engine management systems. If you experience any of the performance issues listed above, it's best to have your car diagnosed by a mechanic rather than just assuming it needs a generic "tune-up." They can identify the specific problem and perform the necessary repairs.
