I have an auto 08 G37 coupe when I rev between 1700-1900 RPMs at around 5-20 MPH this strange noise comes from the exhaust.

Any higher RPMs or faster than 20mph the exhaust sounds perfectly normal.
Also sound only comes in during DRIVE, not in neutral/park.

I am just wondering if this is normal noise for low speed low RPMs ??

*EDIT*
Sorry for bad first video! I have redone it with my phone taped to my license plate lol... so if you hear clanking it's the license plate shaking with my phone.
Recorded at night in automatic drive happens in 1st, 2nd, 3rd gear... 4th gear I am going too fast and the sound doesn't seem to exist. Can't replicate sound in Park/Neutral ! Only in DRIVE !

Car drives normal... no MPG problem, no shifting problems.... but I did have the ECU changed out last year for the high pitch frequency noise if you know what I'm talking about. It was a high pitch noise only a few people can hear (unfortunately me) when you go past 1,000 RPM. And I don't remember if I had this exhaust sound before/after the ECU change. I actually didn't really pay attention to this sound until my friend brought it up to me.

http://www.youtube.com/watch?v=4BycG6oqr_E

 

wei wei! def need a longer video, i don't know what i'm trying to listen to at all.

 

Maybe the noise is from the transmission since it does not happen in neutral and it happens at speeds less then 20 mph, 1st or 2nd gear?

 

Maybe it's the heat shield or the cross bar. Is it the stock exhaust?

 

Everything is stock. How does the heat shield or the cross bar interfere with the exhaust sound? I am not too familiar honestly.

 

it can likely be the infamous exhaust rattle, if you're still under warranty i'd say have your dealer check it out.

 

Sounds like something is resonating. As above, likely a loose exhaust shield somewhere. Jack up the car, then crawl under and touch all exhaust pieces.

 

I tried googling G37 Rattle and I can't find similar results in sound with mine.
It's really weird because it happens ONLY while driving. It's almost like there's different combustion timing at exactly 1800 RPMs because of resistance in motion.

Yes I am still under warranty but hoping to see if anyone on community has had the same sound so when I visit dealership I can tell them exactly what it is if they try to tell me it's normal.

 

You might be on the money...

Quote from another site:
------------------------
Ford Focus 1.8 Ghia '99 V
A little while ago a large section of the aluminium heat shield above my exhaust came loose. Being in a situation where I needed to keep going and without tools, I crawled under and ripped the whole thing off. Now (a few months later) there is a suspiciously aluminium like rattle coming from under the car at low rev ranges, which I suspect to be the remaining heat shield around the bolts which have probably worked a bit loose.
My question: is it safe to remove all the heat shield bolts, or do they serve to hold anything important on?
------------------------

Since he mentions "low rev" it makes me think maybe you're right ?

 

Looks like I am not the only one... this Acura sounds just like mine during low RPM revs.

yeah I will definitely mention loose heat shield at dealership

2002 Acura RSX Rattle at ~3500 RPM - YouTube

 

weiboy helping out weirdwei, wei to go bro! lol. anewei, it sounds like a rattle to me too.

 

Yeah, that's a freqency resonance rattling some piece of sheet metal. If it's an internal baffle in the exhaust, you may have a warranty, but a new exhaust would be in your future.

If it's somewhere else, finding the source will be the challenge. I'd put it in drive, BRAKE ON, and bring up the rpm. See if a buddy can hear it. You can't get too much RPM with the safety ECU limit, unless you disconnect the brake switch or fuse.

Of course, you would have to be careful. Don't drive it into the kitchen. LOL!

Good luck.
Coop

 

Yes I get the sound while braking and revving to 1800rpm not moving

 

Infiniti replaced my muffler and it's all good now

 

what should i do if i have the same problem without warranty :/