ok here goes..from my understanding from the front of the engine leading to the back the cylinders are in order 1-2-3-4-5-6 in a straight line. The firing order is a different answer, for example according to the info: 1-5-3-6-2-4 is the firing order. So cylinder 1 first, then cylinder 5, then cyl. 3, so on and so forth...But the answer to your question is cyl. 5 is the second from the back..