Patrick Bateman Posted January 5, 2017 Report Share Posted January 5, 2017 Don't expect any joy here as it's a rather vague description! Just started doing it this morning so will see if anything changes. Best way to describe it would be a very light sounding clunk/knock, seemingly completely random and coming from the left/rear-ish of the car as far as I can tell. Only seems to happen at around a constant ~30-40mph (not 100% sure on this though, just might not be able to hear it at higher speeds), no difference whether I'm accelerating, braking or going over bumps in the road, have only really noticed it on completely smooth road. The sound is something I'd associate with the suspension but I'd expect a rough road to expose that, this feels totally random then might not happen again for a while. Link to comment Share on other sites More sharing options...
edc Posted January 5, 2017 Report Share Posted January 5, 2017 Is it upon gear change or when you lift off the gas? It could be engine mount if you have some high miles on the car. Link to comment Share on other sites More sharing options...
Boxstercol Posted January 5, 2017 Report Share Posted January 5, 2017 Not something loose in boot / storage box on rear shelf / under seat? Read a few forum posts on various forums where the above has been the culprit of an unusual clunking. Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 5, 2017 Author Report Share Posted January 5, 2017 1 hour ago, edc said: Is it upon gear change or when you lift off the gas? It could be engine mount if you have some high miles on the car. Nope, constant speed going along in a 30 etc. 33 minutes ago, Boxstercol said: Not something loose in boot / storage box on rear shelf / under seat? Read a few forum posts on various forums where the above has been the culprit of an unusual clunking. I'll need to check under the seat, otherwise no. Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 6, 2017 Author Report Share Posted January 6, 2017 Definitely nothing loose in any of the cubby holes or behind the seats. This morning it did it at 3 roundabouts on the bounce as I was braking and changing gear approaching them. If it's an engine mount why would that happen at such low speed and relative smoothness yet caning the thing on the back roads home, cornering hard, braking hard and going on/off the throttle multiple times in second gear doesn't do it. Link to comment Share on other sites More sharing options...
Lonewolfgjp Posted January 6, 2017 Report Share Posted January 6, 2017 I had a phantom noise/light knock that annoyed the hell out of me on my 986. I did all the usual and had it inspected multiple times and found nothing out of the ordinary although it is difficult to tell visually as it gets quite crusty underneath! But after changing coffin arms,droplinks,track rod and the front control arms and also being £500 lighter the car drove fantastic but there was still that annoying noise albeit a bit quieter. In the end I changed the front and rear anti roll bar bushes myself and surprise surprise the noise had gone completely! I would start with those bushes first, about £50 for both sets and fit them yourself as it's very easy. I wished I had done them first as I think that was probably the noise all along ? Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 10, 2017 Author Report Share Posted January 10, 2017 It's definitely at around head height behind me I'd say, trouble is it didn't do it once approaching any roundabouts in the same way today, seems completely random. Would exposing the engine reveal anything that might give a better idea? Link to comment Share on other sites More sharing options...
Araf Posted January 10, 2017 Report Share Posted January 10, 2017 Passenger seat belt buckle on the seat or door trim? Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 10, 2017 Author Report Share Posted January 10, 2017 I shall check but it doesn't sound like it'd be that, I do get the impression it's coming from behind the cabin itself. I'll try and record it on the way to work today. Link to comment Share on other sites More sharing options...
edc Posted January 10, 2017 Report Share Posted January 10, 2017 If it's nothing obvious inside the car then you will have to start inspecting the suspension. The usual culprit for a knocking noise is the rear diagonal arm. This is often more of a snooker balls type noise rather than a very occasional clunk or knock as you describe. You'd hear it over a bumpy B road or cobbled street and sometimes even over speed bumps or dropped kerbs. Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 10, 2017 Author Report Share Posted January 10, 2017 Should have said, the sound itself seems to be around head height. Opening the windows doesn't help for hearing it like it might with a suspension clunk. Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 10, 2017 Author Report Share Posted January 10, 2017 11 hours ago, Araf said: Passenger seat belt buckle on the seat or door trim? That's a journey to work and back with the passenger belt fastened and no noise. Don't want to risk jinxing myself but it appears to be the buckle against the hard plastic edge at the door, seems odd to have never done it before though given it always rests there. Link to comment Share on other sites More sharing options...
Araf Posted January 11, 2017 Report Share Posted January 11, 2017 Fingers crossed, but I think it's a bit early to call it yet. Link to comment Share on other sites More sharing options...
Leonard Posted January 11, 2017 Report Share Posted January 11, 2017 I was about to suggest same. I had same clunk in my 981 and was passenger seat belt buckle.. Link to comment Share on other sites More sharing options...
Mr96er Posted January 11, 2017 Report Share Posted January 11, 2017 Previous seller put a marble in the air box because you haggled him down too much and he needed to have the last laugh... Of course, I would never do that , M'Lord. Link to comment Share on other sites More sharing options...
Greenman Posted January 11, 2017 Report Share Posted January 11, 2017 16 hours ago, Patrick Bateman said: That's a journey to work and back with the passenger belt fastened and no noise. Don't want to risk jinxing myself but it appears to be the buckle against the hard plastic edge at the door, seems odd to have never done it before though given it always rests there. This is possible as mine started rattling for the first time this last week, because the sliding plastic clip that keeps it in position had moved, allowing it more movement options and hence a clunk. However I would have thought it would be pretty obvious if this was the noise, I knew straight away what was causing the problem. Link to comment Share on other sites More sharing options...
Mr96er Posted January 13, 2017 Report Share Posted January 13, 2017 So was it the Seat Belt? Link to comment Share on other sites More sharing options...
Batesy66 Posted January 13, 2017 Report Share Posted January 13, 2017 I've got an occasional knock which I don't believe is the suspension as I don't get it going over uneven road surfaces. It seems to be coming from under the front of the car. I could be on a nice even stretch of road and hear it and was thinking it could be the protective plastic plates on the underside rattling. Haven't had time to check just yet. As I've not long had the car and not knowing the history I'm slightly paranoid I've bought a duffer ? Link to comment Share on other sites More sharing options...
Patrick Bateman Posted January 17, 2017 Author Report Share Posted January 17, 2017 On 1/13/2017 at 9:29 AM, Loz987 said: So was it the Seat Belt? Seems to be! Sound has not been heard since I fastened it. Link to comment Share on other sites More sharing options...
Mr96er Posted January 17, 2017 Report Share Posted January 17, 2017 On 13/01/2017 at 10:51 PM, Batesy66 said: I've got an occasional knock which I don't believe is the suspension as I don't get it going over uneven road surfaces. It seems to be coming from under the front of the car. I could be on a nice even stretch of road and hear it and was thinking it could be the protective plastic plates on the underside rattling. Haven't had time to check just yet. As I've not long had the car and not knowing the history I'm slightly paranoid I've bought a duffer ? When was the last time you saw the cat ??....? Link to comment Share on other sites More sharing options...
Batesy66 Posted January 17, 2017 Report Share Posted January 17, 2017 Good point Loz.......and the wife for that matter..........she just walked in ?. Guess I'll check the roll bar bushes instead!!!! Link to comment Share on other sites More sharing options...
Batesy66 Posted January 29, 2017 Report Share Posted January 29, 2017 Discovered the source of my clunk.........offside front drop link was buggered. I replaced it on Friday and what I thought was going to be 30 minute job turned into a 6 hour slog as the top bolt was seized but after much thumping with a hammer, half a can of WD40 and now arms like Garth, I no longer have a clunk. ? Link to comment Share on other sites More sharing options...
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