1. Gather Supplies:
* New Spark Plugs: Use the correct type and heat range specified in your owner's manual. Commonly, these are iridium or platinum plugs for longer life.
* New Spark Plug Wires (Optional but Recommended): Inspect your existing wires for cracks, fraying, or damage. Replacing them is a good preventative measure, especially if they're old.
* New Air Filter: A clean air filter ensures proper air-fuel mixture.
* New PCV Valve: A failing PCV valve can lead to various engine problems. It's cheap and easy to replace.
* Fuel Filter: Check your owner's manual for the fuel filter replacement interval. It's often overlooked but crucial.
* New Distributor Cap and Rotor (if applicable): The 3.0L V6 in your year might still use a distributor, though some had coil-on-plug ignition. Check your engine to see. If it has a distributor, these wear out and should be replaced if cracked or worn.
* SAE 5W-30 Oil (or as specified in your manual): Use the correct weight and type of oil.
* New Oil Filter: Always use a new oil filter with an oil change.
* Socket Set: You'll need various sizes to remove spark plugs, oil filter, and other components.
* Wrench Set: For various nuts and bolts.
* Pliers: For disconnecting and connecting parts.
* Gloves: To protect your hands.
* Jack and Jack Stands (or ramps): For safe access to the underside of the vehicle.
* Wheel Chocks: For added safety.
* Shop Rags: For cleaning.
* Owner's Manual: Essential for specific torque specifications and part numbers.
2. Steps:
* Oil Change: Drain the old oil, replace the oil filter, and add new oil to the specified level.
* Air Filter Replacement: Locate the air filter housing, open it, remove the old filter, and install the new one.
* PCV Valve Replacement: Locate the PCV valve (usually on the valve cover), remove it, and install the new one.
* Spark Plug Replacement: Disconnect the battery's negative terminal for safety. Remove the spark plug wires (if applicable) and carefully remove the old spark plugs with the correct socket. Install the new spark plugs to the correct torque specification.
* Spark Plug Wire Replacement (If Needed): Remove old wires and carefully install new wires, ensuring a secure connection at both ends.
* Distributor Cap and Rotor Replacement (If Applicable): Carefully remove the cap and rotor, inspect for wear, and replace if necessary.
* Fuel Filter Replacement: Access the fuel filter (location varies; consult your manual), carefully disconnect the fuel lines, and replace the filter. Be aware of fuel pressure; it's best to relieve pressure before disconnecting lines.
* Reconnect the battery's negative terminal.
3. Post-Tune-Up:
* Check for Leaks: Inspect for any oil or fuel leaks after completing the tune-up.
* Test Drive: Take the Ranger for a test drive to check for improved performance and any unusual noises or issues.
Important Notes:
* Safety First: Always disconnect the negative battery terminal before working on any electrical components. Use jack stands when working under the vehicle.
* Torque Specifications: Always use the correct torque specifications for all bolts and fasteners to prevent damage.
* Consult Your Manual: Your owner's manual is the best resource for specific information on your vehicle.
This is a comprehensive guide, but it's crucial to consult your owner's manual for the exact procedures and specifications for your 2004 Ford Ranger 3.0L V6 2WD. If you are uncertain about any step, seek professional help from a qualified mechanic.
