I. Before You Begin:
* Safety First: Disconnect the negative battery terminal before starting any work on the electrical system.
* Gather Supplies: You'll need basic hand tools (sockets, wrenches, screwdrivers), new spark plugs (correct type for your engine!), spark plug wires, distributor cap (if applicable), rotor (if applicable), air filter, PCV valve (if needed), and possibly a fuel filter. It's a good idea to have a shop manual specific to your Fiero's engine.
II. Tune-Up Procedures (General):
* Inspect and Replace Air Filter: Locate the air filter housing and remove it. Inspect the filter. If it's dirty or clogged, replace it with a new one.
* Inspect and Replace PCV Valve: The PCV (Positive Crankcase Ventilation) valve helps prevent crankcase pressure buildup. Inspect it for proper operation (it should move freely) and replace if necessary.
* Inspect and Replace Spark Plugs and Wires:
* Spark Plugs: Remove the old spark plugs, noting their firing order (consult your manual). Install new spark plugs of the correct type and gap (check the manual for specifications). Tighten them to the correct torque specification, avoiding over-tightening.
* Spark Plug Wires: Inspect the spark plug wires for cracks or damage. If any are damaged, replace the entire set with a new set. Make sure the wires are routed correctly to avoid interference and ensure proper firing order.
* Distributor (for engines with distributors):
* Distributor Cap and Rotor: If your Fiero has a distributor, remove the cap and inspect the rotor and cap for cracks, arcing, or corrosion. Replace both if necessary. Ensure the rotor is properly aligned with the distributor shaft.
* Fuel Filter (if applicable): If your fuel filter is accessible, inspect it and replace it if it's clogged or damaged. This is usually less frequent than other tune-up items.
III. Engine-Specific Considerations:
* 2.5L Iron Duke (4-cylinder): This engine is relatively straightforward to tune up. Access to spark plugs and the distributor (if applicable) is generally good.
* 2.8L V6: This engine might require slightly more work to access certain components. You might need to remove some components for better access to spark plugs.
IV. Post Tune-Up:
* Reconnect Battery: Reconnect the negative battery terminal.
* Test Drive: Test drive your Fiero and listen for any unusual sounds or performance issues.
* Check for Leaks: Inspect for any fuel or oil leaks after the tune-up.
V. Important Notes:
* Consult a Repair Manual: A factory service manual or a reputable repair manual specific to your 1985 Pontiac Fiero's engine is crucial. It will provide detailed instructions, torque specifications, and diagrams.
* Professional Help: If you are not comfortable performing these tasks, it's best to take your Fiero to a qualified mechanic. Improperly performing a tune-up can cause damage to your engine.
* Other Maintenance: A tune-up is just one aspect of car maintenance. Regular oil changes, coolant flushes, and other preventative maintenance are essential for keeping your Fiero running smoothly.
This information provides a general overview. Always consult a repair manual for your specific vehicle and engine before starting any repairs. Safety should be your top priority.
