The Trouser Posted July 23, 2013 Share Posted July 23, 2013 The other day in a private car park I hit one of those speed bumps made entirely of tarmac and shaped like a Cabury's Chocolate Finger - not a lot of travel-width compared to the height. I hit it quite hard with the front wheels and it gave the whole car quite a jolt. Since then my Zed has developed a new noise. When I first heard it I thought I was being followed by a motorbike - not a moped straining to keep up, but more like a big bike cruising at low revs. After playing around for a while I've found that the sound has the following characteristics: Its the same regardless of the quality of road surface Its not related to the engine revs (I dropped the clutch at 60 mph and its still there) - so its produced by the forward motion of the car. Its only noticeable over 40 mph and the frequency never changes I can't tell exactly where the sound is coming from - sounds like the whole car. Just wondering if anyone has experienced anything similar and should I be worried? Thanks for any thoughts. TT (Zed is 04 plate, 94K miles and mine from new) Quote Link to comment Share on other sites More sharing options...
Dblock Posted July 23, 2013 Share Posted July 23, 2013 Probably Undertray flapping? Quote Link to comment Share on other sites More sharing options...
Neilp Posted July 23, 2013 Share Posted July 23, 2013 Go look underneath it and say what u see Quote Link to comment Share on other sites More sharing options...
OsakaBen Posted July 23, 2013 Share Posted July 23, 2013 Go look underneath it and say what u see If you see it, say it! Quote Link to comment Share on other sites More sharing options...
The Trouser Posted July 25, 2013 Author Share Posted July 25, 2013 Thanks all! Took a look underneath today - there doesn't seem to be anything hanging down that shouldn't be. Had a feel of the undertray (that's the under-engine shielding immediately behind the front bumper, right?) and found it had some give when I pushed it up - is that right? Also, I recall that some other underside shielding (between to the front wheels) was re-affixed recently as I'd hit something in the road - perhaps that's it? Anyways, I'll get them all checked in the next service which is in a few months. Thanks for your thoughts, TT Quote Link to comment Share on other sites More sharing options...
leonk Posted July 25, 2013 Share Posted July 25, 2013 (edited) "When I first heard it I thought I was being followed by a motorbike - not a moped straining to keep up, but more like a big bike cruising at low revs." Could it be that the jolt has fractured or loosened a joint on the exhaust system, possible the one to the back box? Only a thought. Edited July 25, 2013 by leonk Quote Link to comment Share on other sites More sharing options...
The Trouser Posted July 25, 2013 Author Share Posted July 25, 2013 Thanks leonk - I'll get that checked too. TT Quote Link to comment Share on other sites More sharing options...
veilside z Posted July 26, 2013 Share Posted July 26, 2013 god, I hate those bumps... certainly not modified friendly Quote Link to comment Share on other sites More sharing options...
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