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Anon Deleted Posts : Location : Status : Offline |
Webber ich 34 carb emissions problems I've fitted a new webber 34ich carb, it runs sweet but the hydro carbons and emission tests are 3 times what they would be, any suggestions?---------------------- |
 Mon 10 Dec 2012 @ 09:43
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bluebedouin Global Moderator Posts : 2444 Location : Northampton,England. Status : Offline 
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Switch back to the old one? 
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Mon 10 Dec 2012 @ 15:22
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Anon Deleted Posts : Location : Status : Offline |
If I could I would but it was totally knackered couldn't even adjust the needle so had to sit with foot on revs when stopping at junctions. :-) now it runs like a dream destroying the environment as image goes. Got until April till mot is due to sort it! ---------------------- |
Mon 10 Dec 2012 @ 18:12
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Anon Deleted Posts : Location : Status : Offline |
Well if hydrocarbons and CO are too high then you either have too much fuel or not enough air. Have you checked the air filter is clean? The next checks will be the float height (5.5-6.5 mm with carb top held vertically) and of course the mixture screw adjustment. Also, be sure your choke isn't somehow sticking. Do have any idea if it is running rick at all speeds or just at tick over? |
Mon 10 Dec 2012 @ 18:35
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Anon Deleted Posts : Location : Status : Offline |
carb probs Have you checked the jet sizes?These are important for clean running.Cheers+Beers Jim.---------------------- |
Mon 10 Dec 2012 @ 21:30
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Anon Deleted Posts : Location : Status : Offline |
jimfixit wrote: Have you checked the jet sizes?These are important for clean running.Cheers+Beers Jim. Oh yeah, good point. I had just assumed it was set up for a 2.3 slant, but if it just a generic purchase then it may well need re-jetting. another thing to check is that the carb is the 29mm venturi, not the 25 as for the 1.8L engine. |
Mon 10 Dec 2012 @ 22:14
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Anon Deleted Posts : Location : Status : Offline |
What size should the jet be? Have new plugs, leads and air filter fitted, when I take the screw out completely the c/o sits at 6.5. Idle speed hydro carbons are at 3200 c/o is 8.9 when at about 2000 revs they drop to 2600 which is still way to high. Thanks again Roy ---------------------- |
Fri 14 Dec 2012 @ 09:25
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Anon Deleted Posts : Location : Status : Offline |
What size should the jet be? Have new plugs, leads and air filter fitted, when I take the screw out completely the c/o sits at 6.5. Idle speed hydro carbons are at 3200 c/o is 8.9 when at about 2000 revs they drop to 2600 which is still way to high. Thanks again Roy ---------------------- |
Fri 14 Dec 2012 @ 11:08
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Anon Deleted Posts : Location : Status : Offline |
Co Hc. Hi kosovokid,It is getting way too much fuel through that carb and this will have coked up the backs of the inlet valves and the exhaust ports, try putting a cleaning agent into the tank and give it a good run at about 60mph for about ten miles. I use a fuel cleaning additive before going for MOT and it does reduce the readings, last test readings were CO 4.50/3.10%, HC 1200/54PPM. dOUG. ---------------------- |
Fri 14 Dec 2012 @ 20:28
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Anon Deleted Posts : Location : Status : Offline |
ended up getting a 2nd hand Carb hey presto, it works.  Stay away from this new expensive stuff. It may look shiny but thats about all it has going for it 
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Tue 30 Apr 2013 @ 18:57
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