Complete Engine Tune-Up Guide: What's Included and When to Do It

The term "tune-up" has evolved significantly over the decades. In the carburetor era, it involved adjusting ignition timing, fuel mixture, and much more. Today, a modern tune-up is simpler but still critically important. Here's what's involved.

Modern Tune-Up Components

Spark Plugs

The centerpiece of any tune-up. Fresh iridium or platinum plugs restore smooth idle, improve fuel economy, and eliminate misfires caused by electrode wear. This is the most impactful single item in a tune-up.

Engine Air Filter

A clogged air filter restricts airflow, richens the fuel mixture, reduces power, and increases fuel consumption. Replace every 15,000–30,000 miles depending on environment.

Cabin Air Filter

Often forgotten, the cabin air filter keeps dust and allergens out of the interior. Replace every 15,000–25,000 miles.

Fuel Filter (If External)

External fuel filters (common on pre-2005 vehicles) need replacement every 30,000–60,000 miles. Modern in-tank filters are typically lifetime items.

PCV Valve

The Positive Crankcase Ventilation valve needs replacement on some vehicles every 30,000–60,000 miles. A stuck PCV valve can cause oil consumption and rough idle.

What's Not Part of a Tune-Up

Ignition coils, fuel injectors, and oxygen sensors are not standard tune-up items — they're replaced when they fail or as part of targeted maintenance.

How Much Does a Tune-Up Cost?

DIY tune-up (parts only): $40–$150 depending on vehicle and plug type. Shop labor: $150–$400. The DIY savings are significant, and it's very achievable for most home mechanics.

Shop tune-up parts at Texan Supply — free shipping on all orders.