Rattling noise on deceleration - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

btj_S13 · 05-25-2019, 08:02 PM

I've been having a strange rattling/buzzing noise heard while decelerating after mild/hard acceleration. I don't hear it after light acceleration. Definitely sounds like it's coming from engine bay. I've double checked my downpipe/exhaust. The noise does not go away when the clutch is pressed. It seems to go away around ~2500-2800 RPM. This is a fairly recently rebuilt engine, completed around ~10k miles ago.

Does anyone have any ideas on where to begin looking to fix this noise? Almost every thread i've seen while searching is transmission or diff related noises on decel, which I don't think is the case for me.

Kingtal0n · 05-26-2019, 01:43 AM

are you talking about a noise in 4th gear only during decel between a range of rpm

doesnt sound like it, but just checking because there is one particular decel 4th gear noise I think I've heard all the time

btj_S13 · 05-26-2019, 05:21 AM

No, i'm sure I could hear it in all gears, but it's most the acceleration (1-2-3).

[240sx] · 05-26-2019, 08:23 AM

I got the same noise/ situation, during 3k+ RPM engine braking. Mine's coming from the heat shield on the Cat.(S14)

spitefulcheerio · 07-04-2019, 05:35 AM

What exhaust are you running and how big? My 3" straight pipe was rattling against my frame rail because of worn out hangers. Some Apexi hangers with hose clamps wrapped around them super tight did the trick

tuzzio · 07-05-2019, 07:43 AM

My car does something similar, and i'm pretty sure its cause my exhaust touches the floor. What do you run for mounts? I swapped out my solid avid trans mount for a poly ISR and its night and day better

spitefulcheerio · 07-05-2019, 10:44 AM

Quote:

Originally Posted by tuzzio

My car does something similar, and i'm pretty sure its cause my exhaust touches the floor. What do you run for mounts? I swapped out my solid avid trans mount for a poly ISR and its night and day better

Only problem with those ISR ones is they stretch out pretty fast. The apexi ones are definitely the move

05-25-2019, 08:02 PM	#1
btj_S13 Join Date: Apr 2019 Location: South Carolina Age: 26 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	Rattling noise on deceleration I've been having a strange rattling/buzzing noise heard while decelerating after mild/hard acceleration. I don't hear it after light acceleration. Definitely sounds like it's coming from engine bay. I've double checked my downpipe/exhaust. The noise does not go away when the clutch is pressed. It seems to go away around ~2500-2800 RPM. This is a fairly recently rebuilt engine, completed around ~10k miles ago. Does anyone have any ideas on where to begin looking to fix this noise? Almost every thread i've seen while searching is transmission or diff related noises on decel, which I don't think is the case for me.

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05-26-2019, 01:43 AM	#2
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,646 Trader Rating: (17) Feedback Score: 17 reviews	are you talking about a noise in 4th gear only during decel between a range of rpm doesnt sound like it, but just checking because there is one particular decel 4th gear noise I think I've heard all the time

05-26-2019, 05:21 AM	#3
btj_S13 Join Date: Apr 2019 Location: South Carolina Age: 26 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	No, i'm sure I could hear it in all gears, but it's most the acceleration (1-2-3).

05-26-2019, 08:23 AM	#4
[240sx] Zilvia Addict Join Date: Oct 2013 Location: Highdesert Posts: 849 Trader Rating: (1) Feedback Score: 1 reviews	I got the same noise/ situation, during 3k+ RPM engine braking. Mine's coming from the heat shield on the Cat.(S14)

07-04-2019, 05:35 AM	#5
spitefulcheerio Leaky Injector Join Date: Jul 2018 Location: Florida Posts: 73 Trader Rating: (2) Feedback Score: 2 reviews	What exhaust are you running and how big? My 3" straight pipe was rattling against my frame rail because of worn out hangers. Some Apexi hangers with hose clamps wrapped around them super tight did the trick

07-05-2019, 07:43 AM	#6
tuzzio Nissanaholic! Join Date: Oct 2013 Location: Western Mass. Posts: 2,254 Trader Rating: (3) Feedback Score: 3 reviews	My car does something similar, and i'm pretty sure its cause my exhaust touches the floor. What do you run for mounts? I swapped out my solid avid trans mount for a poly ISR and its night and day better