cd.thomson
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| posted on 31/8/10 at 10:39 AM |
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iva retest fail
need to have 0.2 COs, have 7.5. something tells me I can't quite lean it out that much..
Craig
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marcjagman
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| posted on 31/8/10 at 10:49 AM |
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It is a little high, hopefully it will be something simple to fix. Good luck.
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marcjagman
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| posted on 31/8/10 at 10:49 AM |
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It is a little high, hopefully it will be something simple to fix. Good luck.
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blakep82
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| posted on 31/8/10 at 10:53 AM |
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eek, not good.
what was it like on the first test?
leaky manifold somewhere? Cat in good working order and working properly?
________________________
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cd.thomson
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| posted on 31/8/10 at 01:18 PM |
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not sure what it was on the first test, I aborted both tests so far because the readings have just been so high.
I can't understand it, I took the car to the garage the other week (pre-cat) and I was running a bit lean under the 3.5% CO non-cat limit.
I then turned the mixture screws out about a quarter of a turn each to stop it being lean and fitted a cat. The next emissions test I've shot up
to 7.5%..
Craig
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Werner Van Loock
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| posted on 31/8/10 at 01:42 PM |
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you're running a CAT with carbs? Thought the 0.2% limit is for injection engines with closed loop lambda and catalyst
Don't think catalysts work with carbed engines.
(turning mixture screws sounds as carbs to me)
http://www.clubstylus.be
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cd.thomson
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| posted on 31/8/10 at 01:49 PM |
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im trying to run a cat with carbs yes.
as far as I understood it a cat is a fairly robust method of further reacting exhaust CO with oxygen to form CO2 by passing it over a platinum
catalyst at high temps.
I'm sure a cat should work regardless of fueling methods, but that the overfueling issues inherent with carbs can cause damage to a cat by
polluting it with fuel.
Only just fitted it though so hope that isnt the case.
Craig
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watsonpj
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| posted on 31/8/10 at 02:22 PM |
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Cat will work fine with Carbs as many people have already passed like this including me (Fireblade). I did however have a closed loop cat fitted so
there was active feedback in the system. I know however that many people have passed without a closed loop cat also.
Hope you get it sorted soon
Pete
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jollygreengiant
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| posted on 31/8/10 at 03:32 PM |
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I see from previous posts that you are running an XE engine, if that is the case then an intial mixture reading of 3.5% is NOT lean, in fact a carbed
engine SHOULD be able to run quite happily with an intial mixture reading of about 1.0% and an HC reading of about 50ppm IF the carbs and engine are
OK. SO screwing the mixture needles out from your original setting is probably the worst thing that you could have done. To produce good horse power
from a set up it doesn't need to be rich it just needs to be 'right'.
Hope you get it sorted.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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cd.thomson
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| posted on 31/8/10 at 03:46 PM |
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thanks for that info JGG, will investigate that further.
See if I can keep the engine alive after dialing the mixtures screws right down.
ATM its looking like my car will be going into my dads hands and he'll probably fit a pinto/zetec over the next 6 months or so. If thats the
case its unlikely I'll be posting here as regularly.
Thanks go to everyone who makes this site such an amazing resource 
Craig
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adithorp
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| posted on 31/8/10 at 04:30 PM |
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3.5% is the max limit not the correct mixture and is rich. To get through the cat test you'll need a pre-cat CO of around 0.5-1.0%. The cat will
bring it down from that. You'll get nowhere unless you can get it on a gas meter and set it.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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