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| V6 Exhausts & CO Levels http://www.club323f.com/forum/viewtopic.php?f=18&t=4065 |
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| Author: | Marky Mark [ Sat Jun 18, 2005 10:18 am ] |
| Post subject: | V6 Exhausts & CO Levels |
I know some of you guys have V6 engines with non-standard exhausts. What sort of CO levels are you getting during the emissions check that's part of your MOT test? The test station should give you a print-out. Also, has anyone had to replace a catalytic converter, and used a non-Mazda unit? Some places can supply a "sports cat", which is supposed to keep the CO level down but allow better air flow. I've just had one fitted and I have serious reservations about it, the car only just squeezed through the emission check. The reading was 0.19% CO, but the local Mazda dealer says a ZXi should be more like 0.02%, which is a big difference. |
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| Author: | AndyH [ Sat Jun 18, 2005 1:15 pm ] |
| Post subject: | |
I have a high flow sports cat. In theory, it should keep emissions down to the level of the standard cat, but I haven't had it tested yet (MOT due in Oct). Are you sure it's down to the cat? Did you have your figures checked immediately pprior to fitting the new cat? |
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| Author: | GOGOBROOM [ Sat Jun 18, 2005 7:54 pm ] |
| Post subject: | |
not had mine checked yet with exhaust on so I dont know, will see if I still have CO2 reading from original tho |
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| Author: | Marky Mark [ Sun Jun 19, 2005 12:06 am ] |
| Post subject: | |
The car failed the MOT miserably with a CO at fast idle (2700 rpm - now part of the test) of over 0.6%. Replacing the cat brought this just within the limit for a pass (0.2%), but Mazda man reckons this is still too high for the car. by the way note it's CO not CO2 they measure now.... |
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| Author: | Dragon Rob [ Sun Jun 19, 2005 11:58 am ] |
| Post subject: | |
Ok, just passed my MoT on Fri, here are my results from the V6 (type R) CO % vol 1.018 HC ppm vol 335 CO2 % vol 14.59 O2 % vol 0.75 Lambda 0.988 But as an import I get better limits anyway - CO % <3.500 and HC ppm <1200 p.s. these results are WITHOUT A CAT! :twisted::twisted::twisted: |
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| Author: | Marky Mark [ Sun Jun 19, 2005 8:33 pm ] |
| Post subject: | |
Rob your limits are WAY higher - the UK spec has lambda at 0.970 to 1.03 (mine 1.009) and HC at 200ppm (mine 59ppm). |
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| Author: | Dragon Rob [ Mon Jun 20, 2005 11:08 pm ] |
| Post subject: | |
Yep, the bonus of a rare import! :twisted: |
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| Author: | Marky Mark [ Tue Jun 21, 2005 9:05 am ] |
| Post subject: | |
Have been thinking that if the CO level is still high with a new cat then maybe one of the lambda sensors is failing. I think I read somewhere on this Forum that they can become inefficient due to carbon build-up, so that's something fairly easy (and cheap) to check. Also you can measure the electrical resistance of the sensor, which if it's above a set limit means the thing is faulty. |
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