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rear knock 

 

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 Post subject: rear knock
Posted: Sun Aug 13, 2006 8:48 pm 
Oompa Loompa
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i have noticed recently when i take my foot of the accelerator i get a knock sound somewhere in the a** end. I have a 95 ef i6 sedan. any one have any ideas?
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Posted: Sun Aug 13, 2006 8:52 pm 
Getting Side Ways
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is it in the driveline? or shockies area

 

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Posted: Sun Aug 13, 2006 8:56 pm 
Tyre Shredder
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Location: Werribee
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I also have the same problem, been giving my car too much of a hiding !

Everytime I slow down (de-accelerate - NOT apply the brakes at all) it will knock consistant... but lightly... and it knocks consistent when braking.. i'm hearing it most of the times, but there are times i can't hear it.... - knocking sounds are coming from the BACK OF THE CAR (might be both sides, but because i'm in the driver seat i probably can only hear it from the rear right??).

Some people have said, maybe it's suspension bolts.... but it shouldn't come lose cause the suspension has been in the car over 4 years ?? it has superlows.

I checked all my wheel weights... on 3 of them, they have like 4 weights... on the rear right rim... there is like 8 or something weights.. anyone know what's with that? they are EL-GT copies, my old man has buckled a set of copies (EL GT & BA Rims) ... so maybe my rims are buckled as well ?

I'm going to pull the rear wheels off tomorrow and fiddle around, hope it's nothing serious... like axels or something cause i had been doin standy's on grass... but shouldn't affect anything :|

I have a '94 ED Fairmont

any ideas?
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Posted: Sun Aug 13, 2006 9:04 pm 
Getting Side Ways
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kyro_02 wrote:
I checked all my wheel weights... on 3 of them, they have like 4 weights... on the rear right rim... there is like 8 or something weights.. anyone know what's with that? they are EL-GT copies, my old man has buckled a set of copies (EL GT & BA Rims) ... so maybe my rims are buckled as well ?


Just means that rim needed more weight to balance dont worry about it

 

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Posted: Sun Aug 13, 2006 9:19 pm 
Oompa Loompa
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noisuf wrote:
is it in the driveline? or shockies area


just had all suspension,bushes and steering replaced. did it before that to.
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Posted: Sun Aug 13, 2006 9:25 pm 
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Have you had the Uni joints checked

 

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Posted: Sun Aug 13, 2006 9:29 pm 
Tyre Shredder
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cranborile, when or if you find out the problem, let me know... or if i find out the problem i'll let you know as well.. seem's like we could have simular problem :|
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Posted: Sun Aug 13, 2006 9:34 pm 
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Yeah I'd say uni's. Just dealing with this problem now on a mate's EA.

 

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Posted: Sun Aug 13, 2006 9:43 pm 
Oompa Loompa
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noisuf wrote:
Have you had the Uni joints checked


I thought it might be the uni joints but when i got under and tried to shake the tail shaft there was no movement at the joints. by hand anyway.
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Posted: Mon Aug 14, 2006 3:50 pm 
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When you checked the uni's was there much freeplay in the diff? Also did you check that the rear transmission mount was tight and did not move at all?
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Posted: Mon Aug 14, 2006 4:27 pm 
Tyre Shredder
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i got under my car & there was a bit of movement when pushing uni joints up .... hmm and when turning it by hand... it turns a bit then i can hear like gears engage...

hmm and my rear bush's are screwed... dried and cracked :(
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Posted: Mon Aug 14, 2006 6:01 pm 
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I'd get someone experienced to have a quick look. Maybe get a mechanic or two to quote you on the problem. Its a bit hard to diagnose without seeing how much freeplay you actually have.
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Posted: Tue Aug 15, 2006 11:34 am 
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It will not be the UJ's as if it was there will be a drivline hum over approx 80km/h. I would put my money on the upper and lower trailing arm bushes. More likely to be the upper ones. Does the shifter (if auto) move back and forth whilst under load and going over bumps, if so its definately the trailing arm bushes.
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Posted: Tue Aug 15, 2006 9:06 pm 
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if it's constant when backing off, it's probably more like diff wheel bearings or main bearing or crown wheel or whatever its called.
my old ef did it, but only when you backed off the gas, or braked.

 

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Posted: Thu Aug 17, 2006 12:11 pm 
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i ahd same prob and worked out it was shagged lower control arm bushes and the tailshaft was hitting the floor....replace with noltec arms and after 2 weeks started happening again and found the new bushes were shagged and got another set from noltec (free) and the car has been fine ever since
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