ASVAB Automotive Information Practice Test 569359

Question 1 of 5
Firing Order

The stroke cycle of an engine is governed by the crankshaft which serves to regulate the firing order of the cylinders. All cylinders are not on the same stroke at the same time and correct firing order is important to balance engine operation and minimize vibrations. A common firing order for four-cylinder engines is 1-3-4-2 which indicates that cylinders 1 and 3 fire (power stroke)together and cylinders 4 and 2 fire together.

The firing order of the cylinders in an engine can be found by:

observing the direction in which the intake valves open

identifying the cylinder number

observing the order in which the intake valves open

reversing the cylinder number