I. Ignition System:
* Spark Plugs: Replace with the correct heat range for your engine and driving style (check your owner's manual or a reputable parts store using your engine's specifics). Gap should be set according to manufacturer's specifications (usually around .035"-.045" but verify).
* Spark Plug Wires: Inspect for cracks, fraying, or arcing. Replace if necessary. Use high-quality wires for optimal performance.
* Distributor Cap and Rotor: Inspect for cracks, carbon tracking, or wear. Replace if necessary.
* Distributor Points (if equipped): If your GTO still uses points, they'll likely need cleaning, adjustment (dwell and timing), or replacement. Electronic ignition conversions are highly recommended for improved reliability and performance.
* Ignition Coil: Inspect for cracks or damage. Test its output if you suspect a problem. Replacement may be necessary.
* Ignition Timing: This is crucial. It needs to be set accurately using a timing light according to the specifications for your engine (found in a service manual). This is best done by a mechanic with experience.
II. Fuel System:
* Fuel Filter: Replace the fuel filter. This is vital to prevent contaminants from reaching the carburetor.
* Carburetor (if equipped): This is often the most complex part. A thorough cleaning or rebuild is often needed. This may involve replacing jets, gaskets, and other internal components. Proper carburetor adjustment (idle mixture, idle speed, etc.) is crucial for optimal performance and fuel economy. A professional carburetor rebuild is often worthwhile, especially if you're unfamiliar with carburetors.
* Fuel Pump: Check the fuel pump's pressure and replace if necessary.
III. Air Intake System:
* Air Filter: Replace the air filter with a new one.
IV. Other Considerations:
* Vacuum Lines: Inspect all vacuum lines for cracks, leaks, or disconnections. Replace as needed. These are vital for many systems' proper function.
* PCV Valve: Check the positive crankcase ventilation (PCV) valve. Replace if necessary.
* Valve Adjustment (if applicable): Depending on the engine, you may need to adjust the valves. This requires mechanical knowledge and specialized tools.
V. Obtaining Specific Information:
* Owner's Manual: Your owner's manual (if you have one) will provide some basic specifications.
* Service Manual: A factory service manual or a reputable aftermarket manual is invaluable. These manuals contain detailed specifications, diagrams, and procedures for your specific GTO engine. This is the best resource for detailed tune-up information.
* Pontiac GTO Forums: Online forums dedicated to Pontiac GTOs are excellent resources for finding information and advice from experienced owners and mechanics.
Warning: Working on a car's ignition and fuel systems can be dangerous if not done properly. If you are not comfortable performing these tasks, it's best to take your GTO to a qualified mechanic specializing in classic cars. Improperly performing these tasks can damage your engine or even cause a fire.
