Rattle/Knocking from Catback

adamski89 · Mar 12, 2014

Hi Guys,

Been noticing the noise for the past few weeks intermittently for long periods. Its coming from underneath the driver's seat and I'm pretty sure it's the catback as I placed some steel wool between the catback and the floor of the car whilst it was rattling(at idle)and it stopped.

It only seems to occur on lower quality roads and at lower speeds. Whilst on the motorway at 70 I dont notice it, but idling around a carpark is terrible, especially when turning left(backs up the floor knocking suggestion).

It is now occurring more often and I think I need to take it to the mechanic. Has this happened anyone before or has anyone ideas what I might be in for?

N.B catback is a Blueflame.

Cheers
Adam

Gavin2.6 · Mar 12, 2014

Jack it up and give the exhaust a wobble about and see where its hitting. Usually they just need undoing a touch and realigning. Also check you have not lost a mount.

adamski89 · Mar 13, 2014

Thanks Man!

Jacked it up and it is hitting off the floor - when I applied the smallest amount of pressure from underneath to the front or back of the catback the noise stopped.

Not sure what to do about it as I dont want a garage inventing problems that aren't there!

Gavin2.6 · Mar 13, 2014

The only problem I see is the exhaust is not sitting correctly. Undo the bolts a touch and twist the pipes until they sit nice then lock up the bolts. Should get a few degrees movement in it enough to line it up nice. Also check the rubbers the other side as if they go the weight will lift that side up.

Alanok · Mar 13, 2014

You could always get extended exhaust hangers to give a bit more room away from the car floor. Obviously this will impact on your clearance height to the ground.

RevMonkey · Mar 13, 2014

Powerflex. Exhaust hangars should help

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HWarden · Mar 14, 2014

Powerflex hanger mounts on the tail pipes stopped my HKS from knocking. It sounded like something was going to fall off.

I had to drill out the holes and cut the powerflex mounts to fit.

http://www.ebay.co.uk/itm/Powerflex...93418270?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5afd1a561e#ht_217wt_1055

RevMonkey · Mar 14, 2014

They're the ones I have too

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Rattle/Knocking from Catback

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