ellis Posted November 16, 2012 Share Posted November 16, 2012 Evening - had the car in for MoT and new starter motor today and took in my 1st (nearest the engine) decat to be done after the MoT!! They didn't do it today because they thought it looked like a big job (harder than doing the 2nd one I know) but my question is about the O2 sensor. Is this removed or should it be placed in the decat pipe? I've got both pipes from Whifbitz but there's not O2 sensor hole in pipe 1. So what happens? Or is the O2 sensor in the section before the 1st decat? As I only look in the engine bay if there's a fire or screaming (and it's now dark out there) my knowledge is limited. Cheers - E Link to comment Share on other sites More sharing options...
David P Posted November 16, 2012 Share Posted November 16, 2012 I think you'll find it's a cat overheat sensor. Leave it plugged into the loom and tie it up out of the way, mine lives behind the radio. Link to comment Share on other sites More sharing options...
listy Posted November 16, 2012 Share Posted November 16, 2012 I think you'll find it's a cat overheat sensor. Leave it plugged into the loom and tie it up out of the way, mine lives behind the radio. This. To change the cat out and replace with the decat is maybe a half hour job. It's only the 3 nuts that attach to the down pipe, and the 2 that attach to the rest of the exhaust. The 3 at the top can be a pita to get to mind. Link to comment Share on other sites More sharing options...
safcdixon Posted November 16, 2012 Share Posted November 16, 2012 Big job? I did mine in about 30mins on my drive eith axle stands, so a garage should be able to do it alot quicker, as said the cat sensor is just tied up out the way, make sure they dont chop it off The three upper bolt can be had with a couple of universal joints. Link to comment Share on other sites More sharing options...
ellis Posted November 16, 2012 Author Share Posted November 16, 2012 But surely its the O2 sensor? That's what's in there anyway - a Denso O2 sensor. I was under the impression that NAs have 2 O2 sensors and TTs just the one. If it's not at the top near the manifold end then where is it? Link to comment Share on other sites More sharing options...
safcdixon Posted November 16, 2012 Share Posted November 16, 2012 Theres one on the tt its in the manifold just above where the 1st decat joins on, the one in the cat itself is a cat temp sensor Link to comment Share on other sites More sharing options...
ellis Posted November 16, 2012 Author Share Posted November 16, 2012 Ah, so it is above the decat then! Thought (hoped so)! Will lift bonnet this weekend then and see what's in there. Link to comment Share on other sites More sharing options...
Josh Posted November 17, 2012 Share Posted November 17, 2012 Ah, so it is above the decat then! Thought (hoped so)! Will lift bonnet this weekend then and see what's in there. Hopefully an engine attached to the exhaust system Link to comment Share on other sites More sharing options...
ellis Posted November 17, 2012 Author Share Posted November 17, 2012 Hopefully an engine attached to the exhaust system Could be anything in there mate! As long as its not an NA engine I'll be happy!! Link to comment Share on other sites More sharing options...
Littler Posted November 17, 2012 Share Posted November 17, 2012 Yeah as others have said, the sensor that is in the 1st cat itself is the cat temp sensor, which you can put in the new decat if it has the flange on or you can tie it out the way. The O2 sensor is above the cat and this can be seen from looking in from engine bay Be careful of the 3 bolts though as the can be seized and then snap the thread. Link to comment Share on other sites More sharing options...
Graham1984 Posted November 17, 2012 Share Posted November 17, 2012 Could be anything in there mate! As long as its not an NA engine I'll be happy!! You have no idea how painful it is to open a bonnet of a NA. Link to comment Share on other sites More sharing options...
ellis Posted November 17, 2012 Author Share Posted November 17, 2012 You have no idea how painful it is to open a bonnet of a NA. I do actually - my first Supra was an NA - I still have nightmares! Link to comment Share on other sites More sharing options...
DuaneT.Turbo Posted November 17, 2012 Share Posted November 17, 2012 Pref soak ya bolts for a couple hours in wd40, help to not snap the threads off, worked for me last week Link to comment Share on other sites More sharing options...
Graham1984 Posted November 17, 2012 Share Posted November 17, 2012 I do actually - my first Supra was an NA - I still have nightmares! It's hideous. Link to comment Share on other sites More sharing options...
ellis Posted November 17, 2012 Author Share Posted November 17, 2012 It's hideous. http://www.google.co.uk/url?source=imglanding&ct=img&q=http://us1.webpublications.com.au/static/images/articles/i12/1219_2lo.jpg&sa=X&ei=aGqnUKv_IsrB0gWahIHYCQ&ved=0CAwQ8wc&usg=AFQjCNE9eyai5COhQfGWuGt-lfLIH-zP4g My eyes, my eyes, my beautiful eyes!! Link to comment Share on other sites More sharing options...
Graham1984 Posted November 17, 2012 Share Posted November 17, 2012 Link to comment Share on other sites More sharing options...
JasonR24 Posted November 18, 2012 Share Posted November 18, 2012 It's hideous. http://www.google.co.uk/url?source=imglanding&ct=img&q=http://us1.webpublications.com.au/static/images/articles/i12/1219_2lo.jpg&sa=X&ei=aGqnUKv_IsrB0gWahIHYCQ&ved=0CAwQ8wc&usg=AFQjCNE9eyai5COhQfGWuGt-lfLIH-zP4g That is one clean looking NA engine bay Link to comment Share on other sites More sharing options...
ellis Posted November 20, 2012 Author Share Posted November 20, 2012 1st cat is coming off tomorrow! Link to comment Share on other sites More sharing options...
Littler Posted November 20, 2012 Share Posted November 20, 2012 Link to comment Share on other sites More sharing options...
ellis Posted November 21, 2012 Author Share Posted November 21, 2012 It's off - 1st decat on!! Link to comment Share on other sites More sharing options...
Graham1984 Posted November 21, 2012 Share Posted November 21, 2012 That is one clean looking NA engine bay Yes...... Sadly a NA engine bay. Link to comment Share on other sites More sharing options...
Kaan W Posted November 21, 2012 Share Posted November 21, 2012 Sorry to hijack but can you bolt both cats up to an aftermarket 3" down pipe? Link to comment Share on other sites More sharing options...
Littler Posted November 21, 2012 Share Posted November 21, 2012 Sorry to hijack but can you bolt both cats up to an aftermarket 3" down pipe? Your down pipe should be the '1st decat' technically but the 2nd cat could possibly Link to comment Share on other sites More sharing options...
Kaan W Posted November 21, 2012 Share Posted November 21, 2012 Your down pipe should be the '1st decat' technically but the 2nd cat could possibly Ah right I see, well the second cat is a 2.5" so doubt it will then. Link to comment Share on other sites More sharing options...
safcdixon Posted November 21, 2012 Share Posted November 21, 2012 Ah right I see, well the second cat is a 2.5" so doubt it will then. It should bolt up, i have a 3" 1st decat and 2.5" 2nd decat, then the 3" sideexit system after that and it bolts up fine no leaks etc Link to comment Share on other sites More sharing options...
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