Performance Issues:
* Rough idling: The engine shakes or vibrates noticeably when idling.
* Stalling: The engine dies unexpectedly, 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.
* Reduced fuel efficiency: You're getting significantly fewer miles per gallon than before.
* Backfiring: The engine makes popping or banging noises from the exhaust.
Emissions Problems:
* Check Engine Light (CEL): This is the most obvious sign. The light illuminates due to a detected problem, which could be related to a tune-up. Get it scanned to determine the specific code.
* Excessive smoke from the exhaust: Black, blue, or white smoke can indicate engine problems requiring a tune-up or more extensive repair.
Other Signs:
* Dirty air filter: A visibly dirty air filter restricts airflow, impacting performance.
* Worn spark plugs: These are a key component of a tune-up and can cause many of the issues listed above. Inspecting them visually might reveal wear.
* Car is due for a scheduled tune-up: Consult your owner's manual for recommended maintenance schedules. These usually include tune-up intervals based on mileage or time.
Important Note: A "tune-up" in modern vehicles is often a less extensive procedure than it was in older cars with carburetors. Today, it usually involves replacing spark plugs, wires, air filter, and possibly fuel filter. Some newer vehicles may not even require a tune-up in the traditional sense, as many systems are computer-controlled and self-adjusting. If you're experiencing problems, it's best to take your car to a qualified mechanic for diagnosis rather than assuming you need a tune-up. They can determine the actual cause and recommend the necessary repairs.
