Mike M Posted December 9, 2007 Share Posted December 9, 2007 Driving on the motorway I hit a shed load of surface water as I slowed down for the sliproad, this made the whole car vibrate under my seat and the exhaust sound like it had fell off. The engine still revved ok and smooth. What I cant fathom out is that the exhaust seems perfect, no cracks or joints leaking to the 1st cat and all is secure. The undertray is also secure with no boost hose leaks. This happens everytime I hit water and is much worse when I lift off the throttle. The system is stainless, centre decat is mild steel and the 1st cat is in but not sure what condition its in, is it also Stainless? All suggestions appreciated because I'm stumped and fed up looking under the car to find nothing wrong. Oh and this just seemed to happen after installing the centre decat. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted December 9, 2007 Share Posted December 9, 2007 What is the noise like? Quote Link to comment Share on other sites More sharing options...
Mike M Posted December 9, 2007 Author Share Posted December 9, 2007 Very loud growling like no exhaust was fitted with vibration under the car sounding like its from the exhaust. Really is concerning when it happens. Quote Link to comment Share on other sites More sharing options...
JustGav Posted December 9, 2007 Share Posted December 9, 2007 Have you checked around the joints of the exhaust, if you hit the water hard, you might have pushed a gasket in on the pipes, which would cause a leak. Quote Link to comment Share on other sites More sharing options...
Mike M Posted December 9, 2007 Author Share Posted December 9, 2007 I have mate yeah, theres no tell tale blackness around the joints with gaskets looking intact and I cant feel anything with the motor running. What I did notice was the centr decat is less than a fingers width from the floor at one point and there's a scuffed / burnt bit of underseal at this point. I really cant imagine this contact causing so much noise through the car but hey you never know. On top of that could the differing exhaust materials be contracting awkward with the sudden cooling forcing this decat to hit the floor? Quote Link to comment Share on other sites More sharing options...
JustGav Posted December 9, 2007 Share Posted December 9, 2007 The other thing to check is that it is hanging properly, if it got pushed up with the force of the water, it could have come off the hanger slightly and that would be putting strain on the joints. Quote Link to comment Share on other sites More sharing options...
Mike M Posted December 9, 2007 Author Share Posted December 9, 2007 The other thing to check is that it is hanging properly, if it got pushed up with the force of the water, it could have come off the hanger slightly and that would be putting strain on the joints. From what I seen under there tonight it looks fine and the two hangers, one middle one rear look fine. There isn't too much play either mean you can move it around slightly but is bounces back into position. Really is strange usually exhaust problems are obvious. Quote Link to comment Share on other sites More sharing options...
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