What is the firing order for a 2003 Buick Regal?
The firing order for a 2003 Buick Regal depends entirely on the engine it has. Buicks in that year offered several engine options (e.g., 3.8L V6, 2.4L Ecotec I4, etc.). You must specify the engine displacement (e.g., 3.8L, 2.4L) to get the correct firing order.