Thumping sound from back BRAND NEW Z

Triggy · 07-02-2018, 02:00 AM

Hey guys, got myself a 2019 sport about 2 weeks ago and 600miles into driving it, a thumping knocking noise started coming from the back everytime I started accelerating from a stop, second gear or reverse. Just one knock as soon as I shift. Sounds like an axle moving or maybe a strut?

I'll try to get it checked out at the dealership tomorrow but I wanted some input from you guys before I went in and looked stupid. If anyone has had this happen to them LMK.

RonRizz · 07-02-2018, 05:41 AM

hopefully its not what happened to my nephews girlfriend... see the tech notes from the dealer......

jchammond · 07-02-2018, 07:14 AM

Kinda early for the oil-filled diff bushing to be leaked out/ but they do have movement in them...I’d definitely re-torque the lug nuts.
Lift carpet & cover up in rear and inspect spare tire & subwoofer mounting to ensure tightness.

Spooler · 07-02-2018, 07:42 AM

More than likely it is you. You will become smoother with your shifts/acceleration with some practice. Nothing is wrong with the car.
You're not the first person to have this issue.

Nick370 · 07-02-2018, 08:12 AM

1st and 2nd gear are pretty notorious, sometimes Im perfect and sometimes it feels like my first day...

But also could be the diff bushings... hard to believe it would happen so soon tho...

Also, check for Ravioli cans under seat... LMAO

JARblue · 07-02-2018, 08:22 AM

I'm with JC in that it's probably unlikely to be the diff bushing, but it's pretty easy to check. Look under the rear of the car for signs of fluid leaking out of the bushing at the rear of the differential and/or streaks running down the subframe member in which it is embedded. It will be obvious - a lot of time it explodes and sprays fluid all over the diff housing as well.

Zingston · 07-02-2018, 08:23 AM

Quote:

Originally Posted by RonRizz

hopefully its not what happened to my nephews girlfriend... see the tech notes from the dealer......

The sad truth is, Chef Boyardee can be really hard on a car over time... especially our Zs.

Triggy · 07-02-2018, 03:19 PM

Guess Imma have to get that can of ravioli out from under my seat then...

nandosman · 07-02-2018, 03:32 PM

Quote:

Originally Posted by RonRizz

hopefully its not what happened to my nephews girlfriend... see the tech notes from the dealer......

My sides...

Arrvaxx · 07-02-2018, 05:26 PM

Whatever it is just remember that when its dead its not a call girl...it's a hooker.

MZ DAIZY · 07-02-2018, 07:00 PM

How much does a dealer charge for a chef-boy-r-dee extraction, anyway?

MZ DAIZY · 07-02-2018, 07:04 PM

At least they didn’t charge for the reciprocating muffle bearing, the henway and the pie cost...

Spooler · 07-02-2018, 07:33 PM

Here is exactly what is happening. You have 3 mounting points for the diff. 2 in the front and one gel filled one in the back. When your shifts aren't smooth enough, the front of the diff will move up and contact the rubber bushings in between the diff and the subframe. That is where the thump is coming from. You will figure out how to deal with this over time with the clutch and throttle input. It is really nasty when those bushings go out or are not put back in after a diff change.

B&W_Evader · 07-03-2018, 09:21 AM

Check passenger seat belt. It can bump on the plastic if it's not in it's normal position. Had this happen a couple of times so far after having a passenger in the car. It was "WTF is that?" until I noticed where it came from.

Rusty · 07-04-2018, 12:13 PM

Back in the day when I was working as a mechanic. We had a LTD come in. The owner said that the local Ford dealership couldn't find the thumbing noise when he made a right turn. Took us 3 days to find it. One guy drove the car, and another sat in different places. What we found was a wrench hanging behind the rear seat, off to the left side. It was hung with mechanic's wire. With a note attached to it. The note said "I see you finally found your noise."

Or the guy who couldn't find where the smell was coming from.

Pulled up the carpet and found a half eaten lunch from the factory guy.

I would check the rear diff bushing. If you have done any hole shots. And banging the gears. That's where I would look first.

07-02-2018, 02:00 AM	#1 (permalink)
Triggy Base Member Join Date: May 2018 Location: Quebec, Canada Posts: 22 Drives: 2019 370Z M6 Sport Rep Power: 7	Thumping sound from back BRAND NEW Z Hey guys, got myself a 2019 sport about 2 weeks ago and 600miles into driving it, a thumping knocking noise started coming from the back everytime I started accelerating from a stop, second gear or reverse. Just one knock as soon as I shift. Sounds like an axle moving or maybe a strut? I'll try to get it checked out at the dealership tomorrow but I wanted some input from you guys before I went in and looked stupid. If anyone has had this happen to them LMK.

07-02-2018, 07:14 AM	#3 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Kinda early for the oil-filled diff bushing to be leaked out/ but they do have movement in them...I’d definitely re-torque the lug nuts. Lift carpet & cover up in rear and inspect spare tire & subwoofer mounting to ensure tightness. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

07-02-2018, 07:42 AM	#4 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,803 Drives: 2013 Nismo 370z Rep Power: 2684392	More than likely it is you. You will become smoother with your shifts/acceleration with some practice. Nothing is wrong with the car. You're not the first person to have this issue. envisous and Nick370 like this.

07-02-2018, 08:22 AM	#6 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	I'm with JC in that it's probably unlikely to be the diff bushing, but it's pretty easy to check. Look under the rear of the car for signs of fluid leaking out of the bushing at the rear of the differential and/or streaks running down the subframe member in which it is embedded. It will be obvious - a lot of time it explodes and sprays fluid all over the diff housing as well. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

07-02-2018, 05:26 PM	#10 (permalink)
Arrvaxx A True Z Fanatic Join Date: Jul 2013 Location: Whore Island, MN Posts: 1,243 Drives: 40th F.I. Twin Turbo Rep Power: 18	Whatever it is just remember that when its dead its not a call girl...it's a hooker. __________________ 2010 370Z 40th Anniversary (#480 born 1/19/2010) Fast Intentions Twin Turbo \| Varis Arising II \| Limited Edition Recaro Sportster \| Tuned by Specialty Z \| 604hp 525 torque @14lbs boost on 100 octane

07-02-2018, 08:12 AM	#5 (permalink)
Nick370 Base Member Join Date: Apr 2018 Location: New Jersey Posts: 54 Drives: 2010 Nissan 370z Rep Power: 7	1st and 2nd gear are pretty notorious, sometimes Im perfect and sometimes it feels like my first day... But also could be the diff bushings... hard to believe it would happen so soon tho... Also, check for Ravioli cans under seat... LMAO

07-02-2018, 03:19 PM	#8 (permalink)
Triggy Base Member Join Date: May 2018 Location: Quebec, Canada Posts: 22 Drives: 2019 370Z M6 Sport Rep Power: 7	Guess Imma have to get that can of ravioli out from under my seat then...

07-02-2018, 07:00 PM	#11 (permalink)
MZ DAIZY A True Z Fanatic Join Date: Feb 2018 Location: Atlanta Posts: 1,851 Drives: Miss Daisy Rep Power: 613733	How much does a dealer charge for a chef-boy-r-dee extraction, anyway? Rusty and envisous like this.

07-02-2018, 07:04 PM	#12 (permalink)
MZ DAIZY A True Z Fanatic Join Date: Feb 2018 Location: Atlanta Posts: 1,851 Drives: Miss Daisy Rep Power: 613733	At least they didn’t charge for the reciprocating muffle bearing, the henway and the pie cost...

07-02-2018, 07:33 PM	#13 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,803 Drives: 2013 Nismo 370z Rep Power: 2684392	Here is exactly what is happening. You have 3 mounting points for the diff. 2 in the front and one gel filled one in the back. When your shifts aren't smooth enough, the front of the diff will move up and contact the rubber bushings in between the diff and the subframe. That is where the thump is coming from. You will figure out how to deal with this over time with the clutch and throttle input. It is really nasty when those bushings go out or are not put back in after a diff change. -ZS-Carpenter likes this.

07-03-2018, 09:21 AM	#14 (permalink)
B&W_Evader Track Member Join Date: Aug 2011 Location: CA Posts: 972 Drives: slower than before Rep Power: 387	Check passenger seat belt. It can bump on the plastic if it's not in it's normal position. Had this happen a couple of times so far after having a passenger in the car. It was "WTF is that?" until I noticed where it came from. __________________ \|RIP\|6spd-sport\|OSG-LSD\|XP8\|RBF600\|Eibach Sways\|RE-71R\|FI-34Row\|Gen3-CAI\|Yaw P.S.\|

07-04-2018, 12:13 PM	#15 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,190 Drives: 2011 Nismo GM 6M Rep Power: 2684437	Back in the day when I was working as a mechanic. We had a LTD come in. The owner said that the local Ford dealership couldn't find the thumbing noise when he made a right turn. Took us 3 days to find it. One guy drove the car, and another sat in different places. What we found was a wrench hanging behind the rear seat, off to the left side. It was hung with mechanic's wire. With a note attached to it. The note said "I see you finally found your noise." Or the guy who couldn't find where the smell was coming from. Pulled up the carpet and found a half eaten lunch from the factory guy. I would check the rear diff bushing. If you have done any hole shots. And banging the gears. That's where I would look first. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html Last edited by Rusty; 07-04-2018 at 12:16 PM.

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