Hello guys, my car had a mis fire problem before, and i have fixed it since i replace all spark plugs. Unfortunately, other problems come out then.

1)
When i step on the accelerator, there is some rare sound from the engine which i never heard before i changed the spark plug, even during the misfire problem.

2)
Many white smoke comes out every time when I start the engine.

And here is the video of the weird sound.

YouTube - ‪350z strange sound‬‏

 

I'm no expert, but i spun a main bearing in the sentra once and it sound like this. Maybe double check if the spark plugs are tight.

 

sounds like something in the bottom end to me

 

White smoke usually means coolant in the combustion chamber. Check the compression.

 

agree…check the compression…Its hard to diagnose over a video and a few paragraphs but it sounds like you're gonna be pulling the block to fix both problems...