Quote:
Originally Posted by Lethal1
Hey Guys,
Just an update. The rattle has remained and I have just been dealing with it for the past year. I have since moved and decided to mention it to my new Nissan Service dept. I sent them the audio clip and they think it is spark knock. From what I have read this seems to be pretty harmful to the engine. Anyone familiar with Spark Knock. Any suggestions on a fix. The new Nissan dealership said I should have them do a fule system cleaning to remove carbon buildup. I currently have 57k but remember my car has done this since 30k when I bought it.
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Post a video so we can hear what your grind sounds like.
From your description, its nothing like the sound of mine. The grind that came from my Z was almost as if a stick was stick under the car and dragging. I believe it was part of the heat shield on the cats or another piece under the car that the metal was bent slightly and vibrating at certain frequencies..
Go buy a bottle of seafoam from WALMART. Watch my DIY, and try that out.
Why did you 27k miles to do something about it?