Weird Knocking Noise 81 rx7

Kush47 · 03-11-2013, 02:01 AM

I got a 81 rx7 It making a weird knocking noise towards the back of the car, i don't kno if it the differential or drive shaft, etc.. I hav no idea wat it is, there is no visible problems. If anybody can help on some suggestions on wat the problem is it would be appreciated.

GySgtFrank · 03-11-2013, 11:17 AM

Check your exhaust. Sometimes the hangers break and the pipe will knock against the bottom of the car when moving.

mazpower · 03-11-2013, 04:25 PM

Could also be a rear wheel bearing, it would be a cyclical noise.

ran83 · 04-11-2013, 01:50 PM

I had the same issue with my drive shaft hopefully that isnt the issue because the univesal joints are not changeable on the first gen. i had to buy a new drive shaft all together. good luck!!!

Rotary Evolution · 04-11-2013, 01:57 PM

jack up the rear end and run the car, it will be much simpler to locate where the knock is coming from. just be sure the car is secure on the stands. a car lift would be better but sometimes noises only appear when the suspension is loaded(ie exhaust rattling on the diff).

03-11-2013, 02:01 AM	#1
Kush47 The Newbie Join Date: Apr 2011 Posts: 11 Rep Power: 0	Weird Knocking Noise 81 rx7 I got a 81 rx7 It making a weird knocking noise towards the back of the car, i don't kno if it the differential or drive shaft, etc.. I hav no idea wat it is, there is no visible problems. If anybody can help on some suggestions on wat the problem is it would be appreciated.

03-11-2013, 11:17 AM	#2
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. Posts: 1,011 Rep Power: 16	Check your exhaust. Sometimes the hangers break and the pipe will knock against the bottom of the car when moving. __________________ 1988 N/A SE 2+2, dead stock and staying that way. 1979 SA22C stock? Not so much. http://rotarycarclub.com/rotary_foru...ad.php?t=15585

03-11-2013, 04:25 PM	#3
mazpower Rawr Bearclaw Join Date: Feb 2008 Location: The Souf Posts: 197 Rep Power: 18	Could also be a rear wheel bearing, it would be a cyclical noise. __________________ Illicit Performance Rotary building, porting, tuning, chassis dyno services www.illicitperformance.com

04-11-2013, 01:57 PM	#5
Rotary Evolution rotaryevolution.net Join Date: Feb 2011 Location: Las Vegas, NV Posts: 248 Rep Power: 15	jack up the rear end and run the car, it will be much simpler to locate where the knock is coming from. just be sure the car is secure on the stands. a car lift would be better but sometimes noises only appear when the suspension is loaded(ie exhaust rattling on the diff). __________________ http://rotaryevolution.net

04-11-2013, 01:50 PM	#4
ran83 Rotary Fan in Training Join Date: Apr 2013 Posts: 72 Rep Power: 13	I had the same issue with my drive shaft hopefully that isnt the issue because the univesal joints are not changeable on the first gen. i had to buy a new drive shaft all together. good luck!!!