FIRING ORDER IS 1-8-4-3-6-5-7-2
18436572. it's the same as the old style gm v-8 engines. the cap has even #'s on driver's side and odd on the pass just like the motor. the cap is not in this order so be careful. the cap is marked.
1993 buick 3.8 firing order
Firing order: Industrial GM 3.0 inline 4: 1
the firing order on a GM HEI is 1-8-4-3-6-5-7-2
firing order is 1, 3, 4, 2
The firing order should be 1-3-4-2.
123456
123456 is the firing order from the GM HAYNES REPAIR MANUEL
CTS V6-3.2L VIN N (2003), firing order 1,2,3,4,5,6.
1342
165432
The GM 4.3 firing order, 1, 6, 5, 4, 3, 2. CW.