qexter

Add me to the list - 2009 G37 Sedan. I hear it when leaving work after about 10 minutes of driving, after I come to a stop, then accelerate off the line (not a hard acceleration). Rattles for a little less than 1 second then it's gone abruptly. Just started about a week ago, but it has been very consistent, happening once or twice per drive home. Sounds a lot like engine knock to me.

I'm going to hook my ODBII sensor + Torque app and see what I see, will report back.

The weather has recently changed here (in Atlanta) getting colder. I'm also due for an oil change.

I'm a stock '09 G37 S, 70K miles, Full synthetic, Premium gas, every time.

Nxf0

did you purchased the car new and ALWAYS used "Full synthetic, Premium gas" since day 1?

just trying to figure out if using only Full synthetic, Premium gas helped reduce the noise in my car at all ? I got my car second handed and I am pretty much sure previous owner never care about it at all. as it was 3 years leased car

qexter

I bought the car in 2015, and have used premium / synthetic since then. However, I believe if there had been any damage from previous owners due to regular gas or non-synthetic oil / infrequent oil change, it would have shown up long before now.

Kris9884

iTrader: (3)

I've put about 20k on it myself and have always used premium/synthetic and have a giant binder of service records showing the previous owner used the same oil since it was new. I hope I'm wrong but I'm leaning more towards a bearing issue.

R2-D2

you said rattle but if by any chance that noise also happens to sound like a whine/air pressure its normal. I have it to and googled and lots of people here it. Its just the engine. Kind of sounds like a miny turbo/supercharger you can slightly hear when its quiete 😂

Kris9884

iTrader: (3)

Nope, it's identical to the sound in the video in the OP. Any hiss or vacuum noise is pretty standard, especially with aftermarket intake and exhaust.

waitwhat

iTrader: (1)

Same exact sound as OP here. Full Tanabe exhaust and Takeda intake so I ruled out those already. I keep thinking it's the throttle bodies since the sound they make after shut off kinda sounds like the rattling sound but who knows??

Kris9884

iTrader: (3)

Interesting, I'll check the throttle bodies.

icapture

2011 G37S - 85k mi sedan owner here. After reading through this thread and seeing that no one really understands what this noise is, I have my local Infiniti stealership a call thinking they might be able to shed light on this. Perhaps Nissan had given them a briefing on it. Nope, they had no idea what I was talking about.

I put 0W-40 in during my last oil change, which seemed to remedy the issue for a while, but now it's back. I live in a region that is very hot (southern california) but recently it has gotten colder and the noise has gotten louder.

I will be selling the car soon and I would love to eliminate this noise before hand. It's a "luxury car" that knocks. Not good.

Victory

While it sounds like knock, it's very unlikely that it is engine knock. Cant recreate it in any gear under any load. Nothing on the scantool

Kris9884

iTrader: (3)

Same here, its literally ONLY from a stop and taking off. Is everyone with this sound driving an automatic? AWD or RWD? I'm auto and RWD and hear it.

antirice

iTrader: (2)

RWD 7AT here and been hearing this noise for a while now.

Victory

Mine is a 7at AWD

Weilun Sun

does anyone have solution!?

Victory

this has baffled the community for years.