What's this "clacking" noise?

DIGItonium · 11-20-2012, 01:54 PM

Under hard acceleration and under boost, I hear a brief ratcheting or clacking noise in the engine or drivetrain when I abruptly take my foot off the pedal. I can easily reproduce this when I accelerate hard to about 4-5k RPM and quickly take my foot off the pedal.

It is similar to the brief clacking noise heard on some of the VQ37s on an engine start, which I also hear sometimes.

SouthArk370Z · 11-20-2012, 02:17 PM

Quote:

Originally Posted by DIGItonium

Under hard acceleration and under boost, I hear a brief ratcheting or clacking noise in the engine or drivetrain when I abruptly take my foot off the pedal. I can easily reproduce this when I accelerate hard to about 4-5k RPM and quickly take my foot off the pedal.

It is similar to the brief clacking noise heard on some of the VQ37s on an engine start, which I also hear sometimes.

Since you have boost, I assume you have tweaked the fuel injection. My first guess is that you are not stopping fuel flow fast enough, you're getting unburnt fuel into the exhaust system, and you are hearing muffled explosions. But that's just a guess.

DIGItonium · 11-20-2012, 02:18 PM

I've heard exhaust popping noises, but it sounds like valvetrain noise.

elperuano · 11-20-2012, 02:21 PM

Backfire and what OP is claiming is 2 totally different noises.
Sure is funny to hear that under hard acceleration. Can't really guess the problem other than sumthin moving while under load. If its happening around 4-5k rpm I'm sure that's where ur torque peaks at and that's not good to hear that noise at that moment. Good luck getting it figured out!

DIGItonium · 11-20-2012, 02:23 PM

Thanks, I don't hear it under moderate acceleration or when I ease up on the pedal.

Oh, what's also interesting is when I'm in the higher gears when pushing the motor and abruptly taking my foot off the pedal at low revs like < 4k RPM. I can hear this noise, so it doesn't have to be in the lower gears.

[EDIT] I remember now. I was testing for clutch slippage by briefly flooring it in high gear 3-4k RPM around 40 mph.

fuct · 11-20-2012, 05:33 PM

could be your rear axles clicking. mine are doing it during acceleration and deceleration.

ANMVQ · 11-20-2012, 07:55 PM

Do you have a vid of the noise.?

DIGItonium · 11-21-2012, 01:57 AM

Do you hear the metallic clacking sound on startup? Some G owners reported this as well. It's a similar sound. Just push it a little hard in the high gears and abruptly let off the throttle.

Illmatic370z · 11-21-2012, 02:05 AM

Hey fuct I also hear my rear axels clicking upon acceleration and deceleration show i be worried and take it in for service? Or are these noises common for the Z?

Lug · 11-21-2012, 08:21 AM

wait........you don't transport chickens in your car, do you?

DIGItonium · 11-21-2012, 09:04 AM

Quote:

Originally Posted by Lug

wait........you don't transport chickens in your car, do you?

clacking != clucking

Alstann · 11-21-2012, 11:59 AM

Quote:

Originally Posted by Illmatic370z

Hey fuct I also hear my rear axels clicking upon acceleration and deceleration show i be worried and take it in for service? Or are these noises common for the Z?

I had the same noise - took it into the dealer, and the service manger says it's a very common problem. The rear axles need to be removed, regreased, then retorqued. You should have no issues if you have a warranty with the car or anything. They took my car no questions asked, and I was done in an hour or so.

DIGItonium · 11-21-2012, 12:29 PM

I'm hearing the clunking noise, which is referenced in my other thread. I have to get it checked on my next oil change.

Illmatic370z · 11-21-2012, 01:16 PM

Cool thanks for the info! I do have warranty on my car so on my next
Oil change I'll ask them to check it out.

EVOHUNTER · 11-22-2012, 03:17 PM

u joints, flexplate/flywheel loose or diff bushing, would be my guess.
I had this issue, only in first gear.. ended up to be my u joint in the rear.

11-20-2012, 01:54 PM	#1 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	What's this "clacking" noise? Under hard acceleration and under boost, I hear a brief ratcheting or clacking noise in the engine or drivetrain when I abruptly take my foot off the pedal. I can easily reproduce this when I accelerate hard to about 4-5k RPM and quickly take my foot off the pedal. It is similar to the brief clacking noise heard on some of the VQ37s on an engine start, which I also hear sometimes. __________________

11-20-2012, 02:18 PM	#3 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	I've heard exhaust popping noises, but it sounds like valvetrain noise. __________________

11-20-2012, 02:23 PM	#5 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Thanks, I don't hear it under moderate acceleration or when I ease up on the pedal. Oh, what's also interesting is when I'm in the higher gears when pushing the motor and abruptly taking my foot off the pedal at low revs like < 4k RPM. I can hear this noise, so it doesn't have to be in the lower gears. [EDIT] I remember now. I was testing for clutch slippage by briefly flooring it in high gear 3-4k RPM around 40 mph. __________________ Last edited by DIGItonium; 11-20-2012 at 02:31 PM.

11-20-2012, 07:55 PM	#7 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 19	Do you have a vid of the noise.? __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

11-21-2012, 01:57 AM	#8 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Do you hear the metallic clacking sound on startup? Some G owners reported this as well. It's a similar sound. Just push it a little hard in the high gears and abruptly let off the throttle. __________________

11-20-2012, 02:21 PM	#4 (permalink)
elperuano A True Z Fanatic Join Date: Oct 2011 Location: Southwest FL Posts: 1,374 Drives: G37S Rep Power: 29	Backfire and what OP is claiming is 2 totally different noises. Sure is funny to hear that under hard acceleration. Can't really guess the problem other than sumthin moving while under load. If its happening around 4-5k rpm I'm sure that's where ur torque peaks at and that's not good to hear that noise at that moment. Good luck getting it figured out!

11-20-2012, 05:33 PM	#6 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 24	could be your rear axles clicking. mine are doing it during acceleration and deceleration.

11-21-2012, 02:05 AM	#9 (permalink)
Illmatic370z Enthusiast Member Join Date: Mar 2012 Location: Mcallen Tx. Posts: 316 Drives: 09 370z Rep Power: 13	Hey fuct I also hear my rear axels clicking upon acceleration and deceleration show i be worried and take it in for service? Or are these noises common for the Z?

11-21-2012, 08:21 AM	#10 (permalink)
Lug A True Z Fanatic Join Date: Dec 2008 Location: Texas Posts: 1,926 Drives: 2006 350Z Rep Power: 19	wait........you don't transport chickens in your car, do you? DEpointfive0 likes this. __________________ keep Chubbs in your pocket - Chubbs

11-21-2012, 12:29 PM	#13 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	I'm hearing the clunking noise, which is referenced in my other thread. I have to get it checked on my next oil change. __________________

11-21-2012, 01:16 PM	#14 (permalink)
Illmatic370z Enthusiast Member Join Date: Mar 2012 Location: Mcallen Tx. Posts: 316 Drives: 09 370z Rep Power: 13	Cool thanks for the info! I do have warranty on my car so on my next Oil change I'll ask them to check it out.

11-22-2012, 03:17 PM	#15 (permalink)
EVOHUNTER Track Member Join Date: Jul 2011 Location: Edmonton, Canada Posts: 681 Drives: BOOSTED3-7-0 Rep Power: 15	u joints, flexplate/flywheel loose or diff bushing, would be my guess. I had this issue, only in first gear.. ended up to be my u joint in the rear. __________________ Last edited by EVOHUNTER; 11-22-2012 at 03:50 PM.

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