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Barry Precious
Tinkerer
Moza
4.0GT V8

Posts: 50
Reg: 07-2007

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 Monday, March 23, 2009 - 04:31 pm, by:  Barry Precious (Barryp) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Please excuse me if this is a very basic question but I have not had a car with catalyst converters before...

I have read in another thread that the 'ticking' sound of catalysts after switching off the car could mean that the coils are on their way out. My catalysts tick away for quite some time after switching off the engine. Is this not normal?
Jeff Bedsor
DieHard
QLD
TT

Posts: 550
Reg: 10-2006

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 Monday, March 23, 2009 - 04:45 pm, by:  Jeff Bedsor (Jeff_bedsor) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I think the ticking is just hot metal cooling, not necessarily the cats.
Mark Ribbans
TryHard
SA
UZZ-031 V8, 1972 Mazda RX2 Coupe, TE Gemmy

Posts: 368
Reg: 07-2005

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 Monday, March 23, 2009 - 05:49 pm, by:  Mark Ribbans (V8gtsoarer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
The catalytic converter gets very hot to try burn off all those nasty pollutants, so it may be normal thermal heating and cooling (expansion/contraction) but it could also be indicative of a cat on it's way out which could in turn damage your mufflers.
You can try and feel the exhaust to see if little bits of crap are coming out on your hand, which could indicate time for a new cat.
Barry Precious
Tinkerer
Moza
4.0GT V8

Posts: 51
Reg: 07-2007

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 Monday, March 23, 2009 - 05:56 pm, by:  Barry Precious (Barryp) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Thanks gents...

Would it be possible to just do away with the cats altogether?

Any pro's and con's?
Adam Barry
DieHard
WA
UZZ31 Soarer, BF Falcon Work Ute

Posts: 671
Reg: 08-2005

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 Monday, March 23, 2009 - 07:59 pm, by:  Adam Barry (Acdchook) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Well, I don't know what the law is in Mozambique, but in a lot of places, such as here in Australia, it's illegal to run without cats.

But if it's legal there, then by all means, rip them out. They're just a restriction you don't need. Unless you're a tree-hugging hippie, of course.

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