seba Posted January 27, 2012 Share Posted January 27, 2012 Ok a mate just called me in panic. He was driving his supra at 50m/h (he is a very decent driver) when a hard knocking started from under the car at the rear. He described it as a hammer being hit from under the backseats or somewhere behind the frontseats with a bit of grinding. It is a constant noise and the harder he drives the louder it gets. Also releasing the gaspedal brings the noise. To get the noise a bit under control he kept a bit of presure on the gaspedal, so not giving too much gas but not letting it loos either, that's when there is the least banging noise. He drove the car home at 10 m/h this way 5miles further. Back home he went to ly down under the car and says the cardanshaft (or how do you call it in English) seems ok, or maybe he just can't see it. What could this be? He says the car is undrivable and the noise gets overwhelming. Could this be the differential? Has anyone had this same issue? I know him very well he drives like a grandma so it cant be he forced something. Any advice very welcome ! Quote Link to comment Share on other sites More sharing options...
seba Posted January 27, 2012 Author Share Posted January 27, 2012 Sound is only there when the car is actually moving ofcourse before someone asks Quote Link to comment Share on other sites More sharing options...
Supra Gaz Posted January 27, 2012 Share Posted January 27, 2012 Driveshafts? Prop damage? Diff? Could be a few things, sounds like driveshafts though. Mine went, twas a ball ache. Quote Link to comment Share on other sites More sharing options...
seba Posted January 27, 2012 Author Share Posted January 27, 2012 Driveshafts? Prop damage? Diff? Could be a few things, sounds like driveshafts though. Mine went, twas a ball ache. Is there a way to find out what it is? Visually it all seems ok when the car is standing still. Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted January 27, 2012 Share Posted January 27, 2012 Sounds silly but loose wheel nuts? Quote Link to comment Share on other sites More sharing options...
seba Posted January 27, 2012 Author Share Posted January 27, 2012 Sounds silly but loose wheel nuts? Silly indeed but worth asking him, he isn't stupid tough But he explicitly said the sound was comming from the middle of the car at the rear. Quote Link to comment Share on other sites More sharing options...
Supra Gaz Posted January 27, 2012 Share Posted January 27, 2012 If its the middle I would suspect the prop or diff. Could an exhaust bracket be loose and banging because of the motion when pressing on? He needs to get under the car and have a good nosey. Quote Link to comment Share on other sites More sharing options...
Dnk Posted January 28, 2012 Share Posted January 28, 2012 Propshaft centre support bearing possibly failing or the support bearing housing is loose or a propshaft universal joint is failing Quote Link to comment Share on other sites More sharing options...
Guest Roger NE Posted January 28, 2012 Share Posted January 28, 2012 When diffs start wearing out they normally GRADUALLY start making a whirring/grinding noise Does the banging sound as if someone is hitting the underside of the car? If so, I recently had a similar noise on my Mk3 - it was the propshaft centre bearing It's VERY expensive to replace, so cheapest/easiest option is to just replace the complete propshaft with a secondhand one from a breaker (seeing as they very rarely fail) Quote Link to comment Share on other sites More sharing options...
Graham1984 Posted January 28, 2012 Share Posted January 28, 2012 I had a sound like that when turning and it turned out to be the last rubber exhaust hanger by the back box had slipped off it's holder. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 28, 2012 Share Posted January 28, 2012 If it's that loud I very much doubt it's the exhaust just swinging around a bit - I had that on my mondeo and it was a slightly annoying 'donk' when I went over bumps. This sounds to me like the differential, I had a tooth strip off in a Granada once and it sounded like someone repeatedly hitting the underside of the car with a lump hammer. Quote Link to comment Share on other sites More sharing options...
seba Posted January 28, 2012 Author Share Posted January 28, 2012 No it can't be just the exhaust he checked it. If it's the propshaft centre support bearing is this something i can see without thaking the entire propshaft out of the car? Or what should i be looking for? I hope it's just the differential since i have one lying around for some time and could use that one. How much do propshafts go for? Not new just secondhand ofcourse. Quote Link to comment Share on other sites More sharing options...
Dnk Posted January 28, 2012 Share Posted January 28, 2012 (edited) Get the car up on stands or preferably on a ramp and it should be pretty obvious if its a problem with the prop. The center bearing is held to the bottom of the car with 2 bolts so see if thats loose, also see if the prop has any side to side or up and down movement in it, if the bearings gone then again it should be pretty obvious. Also check the u-j joints and where the prop bolts to the diff, if its none of those then driveshaft cv joints or diff are next on the list Edited January 28, 2012 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Supra Gaz Posted January 28, 2012 Share Posted January 28, 2012 Sorry to see this hasn't been resolved. On a lighter note, my misses saw the thread title and thought you were being rude! Quote Link to comment Share on other sites More sharing options...
seba Posted January 28, 2012 Author Share Posted January 28, 2012 Get the car up on stands or preferably on a ramp and it should be pretty obvious if its a problem with the prop. The center bearing is held to the bottom of the car with 2 bolts so see if thats loose, also see if the prop has any side to side or up and down movement in it, if the bearings gone then again it should be pretty obvious. Also check the u-j joints and where the prop bolts to the diff, if its none of those then driveshaft cv joints or diff are next on the list Ok thx very much for the help. The 2 bolts holding the center bearing are ok. He is going to try to get the car on stands now and start the car to see what he can hear/see. He did say now that when he left MOT yesterday and turned to the right he could hear something grinding, this happened twice and after that the knocking started. Sorry to see this hasn't been resolved. On a lighter note, my misses saw the thread title and thought you were being rude! Quote Link to comment Share on other sites More sharing options...
seba Posted January 28, 2012 Author Share Posted January 28, 2012 Ok update again he put the car on stands and the sound is coming from the passenger rearwheelside somewhere.? He couldn't get under the car as he doesn't have proper equipment to do this safe. Quote Link to comment Share on other sites More sharing options...
Dnk Posted January 28, 2012 Share Posted January 28, 2012 (edited) Driveshaft loose, cv joint failing/failed, wheel bearing, brake caliper, broken damper/spring, diff, loose subframe, wishbone ball joints, etc etc If he can get it on stands or a trolley jack then rotate the wheel, check wheel bearing, take the wheel off then you can see pretty much everything on that corner without getting under the car. As i said it would be much better on a ramp and safer Edited January 28, 2012 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
seba Posted February 8, 2012 Author Share Posted February 8, 2012 Ok i went to take a look at this supra today, the problem was really silly. He had new tyres fitted to his car and after i took the wheel and the brake + brakedisc of today from the side where the cluncking was coming from, and putting it all back together, the noise was gone. A lot of drama for nothing.... Just wanted to post the "solution" incase anyone in the future might start panicking about nothing, and a big thanks for all the advice and help given Quote Link to comment Share on other sites More sharing options...
Robzki Posted February 8, 2012 Share Posted February 8, 2012 So did you find out what it was? Quote Link to comment Share on other sites More sharing options...
seba Posted February 9, 2012 Author Share Posted February 9, 2012 Well i think it was just the wheel or brakedisc that were not fitted tightly enough... We did a long ride yesterday and the noise didn't come back so.... Quote Link to comment Share on other sites More sharing options...
Robzki Posted February 9, 2012 Share Posted February 9, 2012 glad you 'fixed' it. I hate problems like that, had one recently with my propshaft. Still don't really know what it was but 1000 miles later and all fine. Quote Link to comment Share on other sites More sharing options...
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