1-6-5-4-3-2
The firing order for a 1996 GMC Sierra 1500 with a 5.7-liter Vortec engine is 1-8-4-3-6-5-7-2. This order is standard for small block Chevy engines, which includes the Vortec series. This sequence ensures smooth engine operation and efficient power delivery.
1,5.3,6.2,4
The firing order for the 4.3L engine is 165432
18436572
18436572
18436572
I believe it is 18436572 1.8.4.3.6.5.7.2
184364572
Same as all GM 4.3 vortec V6's: 1,6,5,4,3,2
Firing order 1-6-5-4-3-2
Your 2000 GMC Sierra Vortec might be hard to start because the battery or the starter are worn or dead. The GMC Sierra might also be hard to start because of a clogged fuel filter.
Need the firing order for 1996 s-15 4 clelnder