knocking coming from under my s13 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

OProyal · 04-10-2010, 10:01 AM

whenever i go over a bump in the road or turn, something under my car is making a knocking sound. like when i drive, i can feel it under my feet. i figured one of the hangers on my exhaust came loose, but there all good.

anyone else have this problem? do you know what it is?

fullthrottle · 04-10-2010, 10:12 AM

Is your driveshaft securely in its spinning bearing hangar or whatever it is? it might flex up and knock the underbody. Come to think of it my car doesnt have the top half of the loop on it anyways haha.

DataXUnknown · 04-10-2010, 10:21 AM

Do you have an aftermarket exhaust?

When we put the Apexi N1 catback exhaust on my buddies coupe, it's 3" it was hitting the seatbelt bolt. We ended up cutting the bolt shorter and bam fixed problem.

mazersx · 04-10-2010, 10:24 AM

loose old rusty down pipe?

**mrmephistopheles** · 04-10-2010, 10:49 AM

This could be a bunch of different things. Best bet is to get it up on jackstands, get under it and start shaking things that move (ie. driveshaft, exhaust).

Make sure your transmission and engine mounts aren't shot and that everything which should be tight is.

04-10-2010, 10:01 AM	#1
OProyal Join Date: Oct 2009 Location: North Carolina Age: 31 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	knocking coming from under my s13 whenever i go over a bump in the road or turn, something under my car is making a knocking sound. like when i drive, i can feel it under my feet. i figured one of the hangers on my exhaust came loose, but there all good. anyone else have this problem? do you know what it is?

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04-10-2010, 10:12 AM	#2
fullthrottle Zilvia Addict Join Date: Apr 2009 Location: Saint Louis, MO Age: 34 Posts: 661 Trader Rating: (13) Feedback Score: 13 reviews	Is your driveshaft securely in its spinning bearing hangar or whatever it is? it might flex up and knock the underbody. Come to think of it my car doesnt have the top half of the loop on it anyways haha.

04-10-2010, 10:21 AM	#3
DataXUnknown Post Whore! Join Date: Sep 2006 Location: Mission Viejo, CA Age: 31 Posts: 2,934 Trader Rating: (30) Rides Gallery: DataXUnknown Feedback Score: 30 reviews	Do you have an aftermarket exhaust? When we put the Apexi N1 catback exhaust on my buddies coupe, it's 3" it was hitting the seatbelt bolt. We ended up cutting the bolt shorter and bam fixed problem.

04-10-2010, 10:24 AM	#4
mazersx Banned from the Marketplace Join Date: Oct 2008 Location: SoCAL 818/626/714 Posts: 1,904 Trader Rating: (32) Feedback Score: 32 reviews	loose old rusty down pipe?