2007-2012 (& '13-'18) Nissan Altima Misfire Troubleshoot & Fix! [2.5L QR25DE]

What's up everybody!
This is a DIY how-to on troubleshooting & repairing a misfire (misfire OBD codes) on a 2007-2012 4th Gen. Nissan Altima 2.5L 4 cylinder. This will also be practically identical for the 2013-2018 5th Gen. Altima as well. Torque Specs included.
Link for my spark plug replacement video:
• 2013-2018 Nissan Altim...
*DISCLAIMER: I am NOT a Master Tech, just a long time wrencher.
Car in video is a 2012 Nissan Altima Coupe 2.5L.

[@Vmartin70EZ]

I did the swapping of coils replaced #4 and the other 3 Coils as well as the spark plugs, replaced the O2 upstream sensor also it runs good now ... Check Engine light turned on again and now it has a multiple misfire , the O2 bank 1 sensor 1, and the misfire on coil 4. Yet it's running normal no hiccups?

[@cherrywilliams1967]

Hello, what does misfire mean? My Nissan 2017 started does a jerk type thing when driving or accelerating on yesterday ? Thank you

[@TheOriginalBeeCee]

Engine misfires happen when one of the cylinders does not produce sufficient spark or compression and/or lack of fuel. It can be caused by a faulty spark plug, fuel injector, ignition coil and or worn cylinder. Typically, especially with these cars you will usually get a check engine light when the car is misfiring. Misfires can occur both upon engine startup and even in the middle of engine idling. When a misfire happens, your engine might momentarily stumble, and it may even lose speed (RPMs).

[@lillyjimenez6641]

65😅7😅​@@TheOriginalBeeCee😮😊

[@justperry5473]

I just replaced a coil on a 2012 altima for the SAME CODES. I swapped 2&3 and the misfire followed the coil. I replaced #3 only, car ran great for one whole day. Misfire returned the next day, this time on #2, #3 has been fine since the coil swap. I thought Oh, it has 170k miles so I am sure they are all on there way out. After swapping #2 and #3 again, this time the misfire did not follow the coil.
WTF.... What are the chances it blows a coil one day and an injector/burnt valve/blown HG the next? There are NO other codes. The misfire is also somewhat intermittent and not constant, only really happens under decent load. Compression test tomorrow and then I guess I will pull the injectors and swap them if comp test is good.

[@TheOriginalBeeCee]

Wow definitely weird! Did you try swapping another coil just to be a thousand percent? Like swap 1 & 2? Let me know what you find though! Definitely curious about this one. Good luck, hopefully nothing serious 🤞

[@Anthony-de9nf]

My 2008 is doing same here but I can swap coils and pull and clean spark plugs and it'll run fine for a few minutes then misfire comes back

[@eriksony6398]

Launch CRP123 is a good DIY scanner, We have a better Launch scanner, Do you want to test it?

[@TheOriginalBeeCee]

Most definitely!

[@eriksony6398]

@@TheOriginalBeeCee How to MG you?

[@TheOriginalBeeCee]

You can email me @ [e-mail]. I appreciate it!! 🙏👍

[@eriksony6398]

@@TheOriginalBeeCeeJust sent, Thank you