Crank but not start no spark in 3-4 cylinder

Question

Hi I have 2001 Nissan Sentra
Has no spark in 3-4 cylinders
I changed the crank sensor 2 times
Still doesn't work I checked the continuity it's all good ECM is good
Ignition coils are good
I have spark in 1-2 cylinder

Answer 1

Hi there

Check and make sure the coils that won't fire have power and ground to them, the third wire is the signal wire from the computer. If the coils have power and ground, then either the signal wires are broken or the computer isn't sending signal to the coils to fire. If not, replace the computer.