Rossyboy Posted August 7, 2008 Share Posted August 7, 2008 Took the supra in for an MOT yesterday and it failed the emissions test. CO reading was 6.3 instead of 0.3 limit, anyone got any ideas on how to reduce this? I've had a search around and seems the most common route is to find a friendly tester so obviously I am open to PMs if anyone knows any within a few miles of Eastbourne! The car has the front cat in and a kakimoto exhaust, I always thought it'd go through ok with one cat still there! Spec is FMIC, filter, colder plugs, 1 bar boost. Any help would be greatly appreciated of course! Oh and the car will be for sale as soon as it goes through if anyone's interested Thanks in advance Ross Quote Link to comment Share on other sites More sharing options...
Missile Posted August 7, 2008 Share Posted August 7, 2008 Some times putting a standard filter back on if aftermarket helps. But thats alot over what it needs to be. I've also been told in the past, Exhaust sensors get old and can tell the ecu too fuel more which can increase the emmisions.... Quote Link to comment Share on other sites More sharing options...
ADL Mark Posted August 7, 2008 Share Posted August 7, 2008 Sounds like your O2 sensor is past it's best. Mine gets through MOT's ok with one cat back in. Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted August 7, 2008 Share Posted August 7, 2008 (edited) Sounds like your O2 sensor is past it's best. Mine gets through MOT's ok with one cat back in. As above, it sounds suspiciously like to O2 sensor needs changing / cleaning. You might get away with cleaning it (search O2 lemon juice) to get through the MOT but it will need changing soon if it's the culprit. Mike Edited August 7, 2008 by Pixelfill added link to thread (see edit history) Quote Link to comment Share on other sites More sharing options...
Missile Posted August 7, 2008 Share Posted August 7, 2008 http://www.mkivsupra.net/vbb/showthread.php?t=152779&highlight=lemon+juice Think i might have to have a go at this... Quote Link to comment Share on other sites More sharing options...
mr lover Posted August 7, 2008 Share Posted August 7, 2008 could the cat be knackered ? Quote Link to comment Share on other sites More sharing options...
supraGZaerotop Posted August 7, 2008 Share Posted August 7, 2008 asked toyota few months ago, brand new sensor is around £120 or £140, something like that, i carnt remember now, mine needs doing as mine only just got thru. a good few miles drive and a blast up the motorway/carrageway before putting it on the machine i would think would help things along, the cats work best when red hot, so im told. Quote Link to comment Share on other sites More sharing options...
AndyT Posted August 7, 2008 Share Posted August 7, 2008 Think you should take the first cat out first. Keep the second one in. 0.3 seems awefully low compared to your 6.3 too. Quote Link to comment Share on other sites More sharing options...
Rossyboy Posted August 8, 2008 Author Share Posted August 8, 2008 I have only got one cat on it as the exhaust has replaced the other one (Before I bought it). I guess I'll have to try changing the o2 sensor then... I'll post up how i get on After reading up on this a bit it seems that I might be able to get the MOT center to test it as non cat depending on what the chassis number comes up as... Thanks for the replies, still open to suggestions Quote Link to comment Share on other sites More sharing options...
steb9780 Posted August 8, 2008 Share Posted August 8, 2008 After reading up on this a bit it seems that I might be able to get the MOT center to test it as non cat depending on what the chassis number comes up as... Thanks for the replies, still open to suggestions That's how mine passes with no CATS Quote Link to comment Share on other sites More sharing options...
MrRalphMan Posted August 8, 2008 Share Posted August 8, 2008 93 should be ok for a non cat test, I know my 93 UK goes through just fine.... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.