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05-06-08, 08:22 PM
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| Hydro Carbon .. Emissions As you may have seen, I failed the SVA today on high hydro carbon from the near side bank of cylinders. As I understand it, this means that unburnt fuel is getting into the exhaust manifold. The reading was 3534 instead of 1200 max. So quite high then !! I am looking for any advice that you guys can give me regarding what is causing it. It is not mixture as it is only the left side. (the right is only 123) It is not the tappets as these were checked yesterday. I am hoping that you guys have some brilliant ideas before I start thinking of faulty valve(s) or valve seats etc. I nearly forgot the engine is a Cologne 2.8 V6 from a Ford. What do you think?? 
__________________ You do not stop playing because you become old; you become old because you stop playing.       |
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05-06-08, 08:26 PM
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| Misfire or air leak.
__________________ David SR Cobra, 350 Chevy, 120db sidepipes with flames on overrun!! 2nd baby due 23rd Jan. Listen to my 350 idling. http://uk.youtube.com/watch?v=IauqIQuOX0E |
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05-06-08, 08:31 PM
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| One cylinder not firing - oh he said that already...........
__________________ My opinion is worth exactly what you paid for it. CRENDON - go on, you know you want to! |
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05-06-08, 09:57 PM
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 Hi Dave sorry to here the news but its only one thing to sort.could it be the meatering unit .can you check the amount of fuel going to each cylinder .speck
__________________ Be bold and mighty powers will come to your aid |
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06-06-08, 09:11 AM
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| Hydro Carbon .. Emissions Thanks for your comments guys, looks like I have to get my big hammer out !!! Cheers Dave
__________________ You do not stop playing because you become old; you become old because you stop playing. |
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06-06-08, 08:05 PM
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| First thoughts would be to get it set up on a Gas Analiser. The Cologne with the Jetronic EFi was a bitch!!! 5' (20th of a degree) turn on the mixture screw can alter things by several % on the CO reading!!! And a low CO will send the HC skyward! As both banks share the same plenum, don't read it as a problem with only one bank.
__________________ Chris AK 427 351C T5wc Last edited by Purple AK; 06-06-08 at 08:10 PM. |
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07-06-08, 03:25 PM
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 Hi Dave, Bad luck on the sva. Could it be ignition related where the fuel is not burnt? Check the plugs to see if one is a lot darker than the others and check inside the dizzy cap for tracking between a couple of the studs. Does the engine still run well? Bob
__________________ Oh go on, darling. Just a few more ££££££`s and it`ll be finished!!! |
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09-06-08, 09:04 AM
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| plug gaps can effect how well the mixture burns - tight - handles high compression - limits revs - reduces effectiveness of burn wide - strains ht leads, rotor, coil - better emmisions leaky exhaust valve reduces compression - reduces effectiveness of burn - allows un burnt fuel directly into exhaust plenty of options with what's been given above as well - all the best hunting Maurice |
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