4.3 TBI Firing Order [With Diagram]

You can check out the firing order for 4.3 TBI written below. We have included the firing orders of other similar engines as well including the Chevy 4.3 TBI V6 Engine, Chevy 3.8 Engine, and 4.3 firing order distributor.

Note that this sequence has been tested for the 4.3 TBI by our team. This firing order will help you set the correct sequence of ignition, so you face no problems in the future.

4.3 TBI Firing Order

  • Firing Order for 4.3 TBI is 1-6-5-4-3-2.

4.3 TBI Firing Order Diagram

A certain order for ignition is followed in the firing order diagram for a 4.3 TBI (Throttle Body Injection) engine. On the driver’s side, cylinder 1 is the front most of the cylinders, which are numbered 1 through 6. The firing sequence goes cylinder 1, cylinder 6, cylinder 5, and so on sequentially. A series of the graphic looks like 1-6-5-4-3-2. This engine firing order guarantees proper timing and combustion, allowing for effective functioning and the supply of power. It’s crucial to remember that this firing order only works with the 4.3 TBI engine setup.

Firing Order Applies To

4.3 TBI firing order applies to engines, such as:

    • Chevrolet 4.3-liter V6 TBI (Throttle Body Injection) engine
  • GMC 4.3-liter V6 TBI engine
  • Chevrolet S10 and GMC Sonoma trucks equipped with the 4.3-liter V6 TBI engine
  • Chevrolet Astro and GMC Safari vans with the 4.3-liter V6 TBI engine

Torque Specifications

Vehicle NameHorsepower/RPM Torque/RPM
GMC Safari355@5,600 rpm383@4,100 rpm
Chevrolet Silverado 1500285@5,300 rpm305@3,900 rpm
Chevrolet Express276@5,200 rpm298@3,900 rpm

What is the Purpose of the Firing Order in a 4.3 TBI Engine?

The firing order specifies the order in which the cylinders ignite, guaranteeing accurate ignition timing and efficient engine operation.

Can the Firing Order be changed in a 4.3 TBI Engine?

Changing the firing sequence can cause engine problems because it is particularly engineered for optimal performance and is not advised.

Check out 2015 Chevy 5.3 Firing Order

What happens if the Firing Order is Incorrect in a 4.3 TBI Engine?

Incorrect firing order results in misfires, engine vibration, and poor performance. It can also cause damage to the engine if left unaddressed.

Engines with Similar Firing Orders

  • Chevrolet S10: 1-6-5-4-3-2.
  • GMC Sonoma: 1-6-5-4-3-2
  • GMC Safari: 1-6-5-4-3-2
  • Chevrolet Astro: 1-6-5-4-3-2

2000-2004 Chevy S10 4.3L Engine Firing Order and Cylinder Location

Jake Mayock