Sucking Air

[noely1]

Hey guys ive recently noticed that right under where i sit in the drivers seat, whenever in gear (manual transmission) and in hi revs (i.e. 4000rpm +) my car has this really loud sucking noise.. or as if thers a massive hole in the exhaus system and air is jus gushing out of it...

it has lost top end power as well... i got a new cat fitted today - didnt fix the problem - i can still hear it occassionally... and the guys had it on the hoist and listened through a stethoscope (sp) on every joint, gasket and bit of exhaust and couldnt find any faults... before and after the cat being fitted..

just wondering what this could be?? im under the impression the stock extractors wouldnt have anything wrong with them.. they generally dont get holes in them do they?? that is one thing they couldnt check at the time because stuff was in the road so i just said dont worry about it...

anyway if anyone has a solution/suggestion would be much appreciated!

Cheers

[R34 -_-]

The exhaust runs underneath the passenger side of the car and for the record if you had an exhaust leak you should be able to smell it under the car, other thing is to check to see if your extractors are cracked etc. Try checking your air intake aswell.

[noely1]

okay illl get the stock extractors looked at... i checked the air box today aswell and cant see/hear anything out of the ordinary... so maybe it is my extractors.. cheers

[PSI-FED]

You sure the gasket on the flange of the cat is on and tightened properly ?? The sound you would get from a non present or loose gasket is very much liek the one youve described

[nrs89]

Hey man have you tried looking for actual holes i your cars floor. You never know.

[R34 -_-]

And isn't there a trick people play on each other where they put a cable tie around something (i.e drive shaft) so when it spins it makes that funny howling kinda noise?

Edited March 10, 2010 by R34 -_-

[noely1]

umm yeah well when i first took it to the exhaust shop to get it all looked at.. there was black residue all around the connection of the cat etc but it didnt seem to be making any noise from that section at all when he put the stethoscope to it...

but then i got a hi-flow cat in that same day so everything was taken off and tightened again so im pretty sure it isnt the flange or around the cat area... and it was done at a reputable exhaust shop with a high rep.

and nah i havent looked for holes in the floor.. but i will do never thought of that since i did get it converted to a manual a month or so ago and some modifications were done to fit my clutch pedal, i believe its only started doing it after all this work was done...

but anyway.. its going down this arvo to get looked at hopefully and i'll get all of these things checked out but yeah im still leanin toward my extractors now... i have been wanting a set from DKNE so maybe here's my excuse

cheers

Edited March 10, 2010 by noely1

[heapsgood]

in my VT i have a cracked exhaust manifold that made a sucking noise, on idle, but when the motor heated up it stopped :s. got it fixed for $60

[k24]

cool

[noely1]

cool? righto.. lol