Cylinder three misfire?

Tiny
94FATBOY
  • MEMBER
  • 2007 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 202,000 MILES
I got a car at auction, and it has a misfire. I replaced plugs and coil packs. Also replaced 02 sensors. Still has a misfire on #3 cylinder. I unplugged the #3 coil, and it is the only one that did not change the way the engine ran. I did notice the wiring to #3 coil has been cut and taped back together. I do not know how to check for voltage at the coil, where to look next.
Tuesday, April 1st, 2025 AT 4:19 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,431 POSTS
Sure, I can help you fix it, I would use this guide to help check the coil output and trigger signal:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Next, remove the spark plug for you just replaced to see what color it is which can tell us what is going on. I would also check the compression of the cylinder; you can rent a compression gauge at the auto parts store for cheap or free.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over these guides and get back to us.
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Wednesday, April 2nd, 2025 AT 12:05 PM

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