Hi, so a month ago my car was having problems. It was shaking and the engine light was on. I figured it was an ignition coil and i changed the one not working after consulting with a mechanic. But the problem still didn’t fix. I then changed all the spark plugs and my car started working good. Now after a month i have the same problem, my car is shaking. Do i change all 4 of the ignition coils?
Probably worth doing especially if it’s a 4 cylinder (easier/cheaper) if it’s a coil and they’re easy to access then pull each one and look for and hairline cracks/splits on them and or oil to help pinpoint a specific one. Another thing to try is with the engine running spray a bit of water around each coil and see if there’s a change in engine noise.