The firing order depends on the engine. The 1999 Camry came with two possible powertrains: a 2.2-liter inline-four (5S-FE) with a firing order of 1-3-4-2, and a 3.0-liter V6 (1MZ-FE) with a firing order of 1-2-3-4-5-6.
In 1999, Toyota offered the Camry with both an inline-four and a V6, so the correct ignition sequence varies by which engine is in the car. This article outlines the two common configurations and where to find the exact mapping on your vehicle.
Engine options in the 1999 Camry
2.2L inline-4 (5S-FE)
The 2.2-liter inline-four used in most 1999 Camry models follows a four-cylinder firing order. The sequence is outlined below.
- 1-3-4-2
Concluding note: For the 5S-FE engine, cylinders are numbered from front to rear (1 to 4). The ignition events occur in the order 1, then 3, then 4, then 2, and the cycle repeats. This firing pattern helps balance the compact four-cylinder layout and is common across many Toyota 4-cylinders of that era.
3.0L V6 (1MZ-FE)
The 3.0-liter V6 used in higher trims of the 1999 Camry employs a six-cylinder firing order that alternates between the two banks. The typical ignition sequence is:
- 1-2-3-4-5-6
Concluding note: On a V6, cylinder numbering spans two banks (front and rear). The firing order above represents an alternating pattern between banks to maintain balance. For exact bank-to-cylinder mapping on a specific VIN, consult the service manual for the 1MZ-FE engine in the Camry.
Practical considerations
If you’re performing maintenance such as spark plug replacement, timing-related work, or distributor servicing, confirm which engine your Camry has by checking the engine code on the valve cover or under the hood sticker. The two engines have distinct ignition layouts and maintenance procedures.
Summary
The 1999 Toyota Camry could use either a 2.2L inline-four with a firing order of 1-3-4-2 or a 3.0L V6 with a firing order of 1-2-3-4-5-6. Verify your specific engine to apply the correct ignition sequence when performing ignition-related tasks, and consult the owner’s manual or a repair guide if in doubt.