Jay M1988 Posted January 8, 2014 Share Posted January 8, 2014 Hey all Right I've owned the 350 for over 6 weeks now and there's something wrong which seemed hidden when I'd test driven it. Basically there is a rattle from under the the gearbox area. The rattle goes away once accelerator is fully down but upon being on and off the throttle the rattle appears. Once warmed up it rattles a little as it sits in neutral. But generally on and off the throttle. Also to note there is a vibration under heavy throttle and upon allowing the car to slow while the revs are decreasing again not all of the time but randomly. The rattle wasn't apparent upon the test drove at all but car wasn't driven too hard. The rattle is definitely getting more and more apparent and has went from every now and then on and off throttle to every day now. I thought a loose exhaust as it has a aftermarket scorpion exhaust but this seems right down the centre from gear stick to just behind the seats. I'm going to jack the car up at the weekend and have a good look not too sure what I'm checking tbh but ill see what moves and doesn't haha. In truth I'm worrying like mad as this was a big purchase for me and due to not hearing it at all on the test drive to it occurring every day now is distressing. The gear changes are a little sloppy but I've noticed the gearbox is made this way I've not had any issues selecting the gears as yet though. Any help or guidance is appreciated. Quote Link to comment Share on other sites More sharing options...
nowhereboy Posted January 8, 2014 Share Posted January 8, 2014 did you buy it from a trader or a private sale? I'd just take it straight back to the garage if it was a trader and get it checked out. Mechanically I can't help you I'm afraid but I'm sure someone will pop up with possible causes soon. Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 Thanks mate it was private, just want advice on it as soon as to clear my mind. Quote Link to comment Share on other sites More sharing options...
peteman35 Posted January 8, 2014 Share Posted January 8, 2014 I had the heat sheilds of my cats rattle.. They rot away in the end Quote Link to comment Share on other sites More sharing options...
ZEUS Posted January 8, 2014 Share Posted January 8, 2014 Sure it's not just the heat shields? I've just had to rebolt mine on as they made an awful noise Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 It doesn't seem to happen when cold and only when cars started to warm up a tad. Ill be sure to check heat shields this weekend. I've dipped the clutch and pressed the accelerator a little as I've stated it's off and on the throttle and it occurs with clutch engaged or not. Quote Link to comment Share on other sites More sharing options...
peteman35 Posted January 8, 2014 Share Posted January 8, 2014 Most likely Cats mine used to rattle some days and not rattle others... Quote Link to comment Share on other sites More sharing options...
R35LEE Posted January 8, 2014 Share Posted January 8, 2014 Could be the heat shields, the selector bolt under the car could be lose or it could be the nylon socket for the stick (cals one on here was worn and did this before I swapped it out). Drive the car and hold the knob with some force to see if it stops Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 Sounds silly but location wise it seems under the car but in the gearstick area. Quote Link to comment Share on other sites More sharing options...
ATTAK Z Posted January 8, 2014 Share Posted January 8, 2014 Heat shield above the back box can rattle a bit before it falls off ... check that one too Quote Link to comment Share on other sites More sharing options...
Neilp Posted January 8, 2014 Share Posted January 8, 2014 Sounds silly but location wise it seems under the car but in the gearstick area. Thats where the cats are Quote Link to comment Share on other sites More sharing options...
ZEUS Posted January 8, 2014 Share Posted January 8, 2014 Heat shield above the back box can rattle a bit before it falls off ... check that one too Mine was like this Quote Link to comment Share on other sites More sharing options...
davey_83 Posted January 8, 2014 Share Posted January 8, 2014 Also to note there is a vibration under heavy throttle and upon allowing the car to slow while the revs are decreasing again not all of the time but randomly. The gear changes are a little sloppy but I've noticed the gearbox is made this way I've not had any issues selecting the gears as yet though. sounds to me like worn engine/gearbox mounts Quote Link to comment Share on other sites More sharing options...
KyleR Posted January 8, 2014 Share Posted January 8, 2014 Noisey clutch? Just a though as it's quite common for new owners to come on here panicking about it. Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 No I've found that noisy clutch noise and I'm ignoring that. This is more pronounced actuall rattle. Only on and off throttle or when idling and stopping and pulling away. Quote Link to comment Share on other sites More sharing options...
R35LEE Posted January 8, 2014 Share Posted January 8, 2014 Have a mechanic or handy friend look at the heat shields Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 Will do lee would it be heat shields when it doesn't rattle from first start up only from roughly 10mins into the journey. I wish there was a local garage in northeast area that knows there 350z's Quote Link to comment Share on other sites More sharing options...
Stutopia Posted January 8, 2014 Share Posted January 8, 2014 (edited) The y pipe on my exhaust was rattling against the w-brace and made a racket inline with what you're describing, might just be something as simple as them being quite close to each other and touching at certain temp/rev combos, defo worth a look when you get it up and easy/cheap to sort. Hope it's nothing serious. Edited January 8, 2014 by SuperStu Quote Link to comment Share on other sites More sharing options...
Jay-350z Posted January 8, 2014 Share Posted January 8, 2014 Will do lee would it be heat shields when it doesn't rattle from first start up only from roughly 10mins into the journey. I wish there was a local garage in northeast area that knows there 350z's Could be as it's a different sound vibrations when in the higher revs. Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 8, 2014 Author Share Posted January 8, 2014 All your help is much appreciated guys, this weekend is going to be fun. Quote Link to comment Share on other sites More sharing options...
a2orry Posted January 8, 2014 Share Posted January 8, 2014 If the vibration gets worse my thoughts are duel mass flywheel. Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 12, 2014 Author Share Posted January 12, 2014 Well guys thank you for your help, I'm relieved to update this after weekend spent underneath the car. These scorpion exhausts are a lil out on fitment, issue was one of the brackets weren't in the exhaust hanger. Problemo solved nice and easy haha Quote Link to comment Share on other sites More sharing options...
ZEUS Posted January 12, 2014 Share Posted January 12, 2014 That's good news Quote Link to comment Share on other sites More sharing options...
HARMLU Posted January 12, 2014 Share Posted January 12, 2014 I would give it a full service, including gearbox and diff oil along with a tube of moly slip. This would be a good thing to do anyway so you wouldn't lose anything from doing it and see if the problem persists. Is it consistently all the time it happens? Ie can you guarantee that when you let off the revs you'll get the vibration? And does that vibration come through the gear stick? Quote Link to comment Share on other sites More sharing options...
Jay M1988 Posted January 12, 2014 Author Share Posted January 12, 2014 It was the exhaust hanging off the hanger mate these scorpion exhausts don't sit too well, because of this the exhaust was sitting against the rear transmission shield No it's back on the hanger no more vibration Quote Link to comment Share on other sites More sharing options...
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