Cylinder Identification & Firing Order
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Cylinders 1/3/5/7 are on the left bank and cylinders 2/4/6/8 on the right bank. Firing order is 1-8-7-2-6-5-4-3