The firing order for a typical 5.3 L Chevy V8 (LS-based) is 1-8-7-2-6-5-4-3.
This article explains what that sequence means for the 5.3L engine family, which models it covers, and how to apply the information during maintenance or diagnostics. It also notes common ignition setups for these engines and how to verify your engine's firing order when replacing spark plugs, coils, or timing components.
Firing order for the 5.3L LS V8
The following list shows the standard eight-cylinder firing sequence used on most 5.3L LS engines (found in trucks like the Silverado/Sierra and SUVs like the Tahoe):
- 1st in firing order — Cylinder 1
- 2nd in firing order — Cylinder 8
- 3rd in firing order — Cylinder 7
- 4th in firing order — Cylinder 2
- 5th in firing order — Cylinder 6
- 6th in firing order — Cylinder 5
- 7th in firing order — Cylinder 4
- 8th in firing order — Cylinder 3
Note: The standard sequence is consistent across most factory-installed ignition systems for the 5.3L LS family. If you are working with a non-standard engine variant or aftermarket ignition, confirm the exact sequence with the service manual or GM parts documentation.
Why the firing order matters
The firing order tells the ignition system which cylinder fires in which sequence. Using the correct order helps maintain engine balance, fuel efficiency, and smooth operation. When servicing spark plugs, coils, or timing components on a 5.3L LS, follow the factory firing order precisely to avoid misfires or damage.
Summary
The 5.3L Chevy V8 (LS family) uses the firing order 1-8-7-2-6-5-4-3. This sequence is standard for most LS-based 5.3 engines in GM trucks and SUVs. Always consult the specific model year manual if you encounter variations or aftermarket modifications, and use this order to guide spark plug and ignition service for optimal performance.