The firing order for the GM 3.8 L V-6 is 1-6-5-4-3-2.
Standard firing order
Below is the conventional firing sequence used by most GM 3.8 L V-6 engines (the 3800 family) across common model years and configurations. The numbers correspond to the engine’s cylinder numbers as used in service manuals.
- 1
- 6
- 5
- 4
- 3
- 2
The order 1 → 6 → 5 → 4 → 3 → 2 drives the crankshaft in a balanced sequence to minimize vibrations and optimize ignition timing. If you’re diagnosing a misfire or replacing timing components, verify the exact cylinder numbering for your specific year and model in the factory service manual, since layouts can vary by generation or configuration (distributor versus coil-on-plug setups).
Cylinder numbering and bank orientation
On a GM 3800 V-6, odd-numbered cylinders (1, 3, 5) are typically on one bank and even-numbered cylinders (2, 4, 6) on the opposite bank. When viewed from the front of the engine, the front-most cylinder is usually labeled as #1 on the left bank, with numbers continuing along each bank. Always confirm with your vehicle’s manuals or a factory diagram for the exact year/model, as layouts can vary slightly by generation.
Summary
Bottom line: For most GM 3.8 L V-6 engines, the firing order is 1-6-5-4-3-2. Use this sequence as the baseline for ignition timing checks, spark plug replacement, and diagnostic work, and always verify against your specific vehicle’s documentation to account for any year-model variations.