* Owner's Manual: The most reliable source. Check the section on engine specifications or maintenance.
* Repair Manual: A Haynes or Chilton repair manual specific to your car's year and model will definitely have this information, usually in a diagrammatic form.
* Online Automotive Repair Databases: Sites like AllDataDIY, Mitchell 1, or others (some require a subscription) provide detailed repair information, including firing order diagrams.
* Pontiac-Specific Forums: Online forums dedicated to Pontiac vehicles (e.g., Grand Prix forums) may have members who have posted this information. Search the forum using keywords like "1998 Grand Prix 3.8 firing order."
* Under the Hood (Sometimes): While less common, a sticker with engine specifications, *including* the firing order, might be located under the hood of the car. Look carefully around the engine compartment.
The Firing Order Itself: While I can't provide a visual diagram, the firing order for most 3.8L Buick V6 engines (which is what was used in many Pontiac Grand Prix models) is typically 1-6-5-4-3-2. However, always verify this using one of the resources listed above as there might be slight variations depending on the exact engine code. Don't rely solely on this information.
