davidimurray
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| posted on 11/3/14 at 09:04 PM |
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Grrrrr - bloody car
Finally got my reg just before Xmas. Been out for a few drives and decided to take the car to work for the first time. Went great' just ticked
over 300 miles and everyone loved the car and even a few test rides. Drove home and noticed a few pops and bangs at light throttle. Got home and
noticed lambda had gone from 13 at idle to 14.4. Car was misfiring at low throttle but OK at wider openings. Whipped the pilots out of the bike carbs
and cleaned them. Took out for a test drive and no better and still lean. So annoyed was really looking forward to taking her to work again tomo
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AdrianH
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| posted on 11/3/14 at 09:09 PM |
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Slight leak perhaps on inlet side or would it be the exhaust side never sure?
I believe you can get pops and bangs if on exhaust side on over run.
Can you test around the inlet manifold with a can of wd40 see if revs improve when going around the gasket area, or just check all is tight.
Adrian
Edit to add to thoughts, if leek on exhaust side it will lean off the lambda and add more fuel so that un-burnt fuel goes into the exhaust to cause
the pops and bangs!
only guesswork.
[Edited on 11-3-14 by AdrianH]
Why do I have to make the tools to finish the job? More time then money.
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davidimurray
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| posted on 11/3/14 at 09:14 PM |
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quote:
Originally posted by AdrianH
Slight leak perhaps on inlet side or would it be the exhaust side never sure?
I believe you can get pops and bangs if on exhaust side on over run.
Can you test around the inlet manifold with a can of wd40 see if revs improve when going around the gasket area, or just check all is tight.
Adrian
Have tried around the carb rubbers and balance hoses with no change. I think its a proper misfire as it sounds like it is popping under the bonnet and
also started hesitating. Wondering whether I could have a dead spark plug.
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adithorp
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| posted on 11/3/14 at 09:16 PM |
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Sounds like you've got an air leak. Prob' a vac pipe off, inlet gasket loose etc.
Spray a bit of carb cleaner around and if it goes near the leak you'll hear the engine note change. Alternative (and more accurate) is take the
burner nozzle off a blow lamp and replace with a length of hose on and then feed the gas around the inlet side. Revs will raise when you find the
leak. Only do in a well ventilated area though.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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mccsp
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| posted on 11/3/14 at 09:45 PM |
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Have you re-spaced the carbs? Could be the ballancing between the carbs. I have to reballance my throttle bodies periodically.
Why do it the easy way, when I can do things my way!
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davidimurray
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| posted on 11/3/14 at 10:03 PM |
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quote:
Originally posted by mccsp
Have you re-spaced the carbs? Could be the ballancing between the carbs. I have to reballance my throttle bodies periodically.
Carbs are respaced so will check the balance again tomo.
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davidimurray
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| posted on 12/3/14 at 06:48 PM |
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Update time.
Checked the balance and it was out. Rebalanced the carbs and it is a hell of a lot better, but still has a small misfire.sprayed all around the
manifold and no change in engine note. Lambda is still showing a bit leaner than it was.
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jacko
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| posted on 12/3/14 at 07:01 PM |
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Exhaust look for small cracks near the plate that bolts to the head not me but some one i know had this happen on there car
They have a MK manifold fitted
Jacko
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mccsp
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| posted on 12/3/14 at 07:48 PM |
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Have you had the plugs out and cleaned them since setting the, could be fouled? Might be worth then rechecking ballance again.
Why do it the easy way, when I can do things my way!
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davidimurray
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| posted on 12/3/14 at 08:29 PM |
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Put a new set of plugs in and rechecked balancing which is spot on. Have also soaked around the manifolds and carbs with wd with no change in revs.
At idle the miss is like a little burble, at 2000rpm it is barely there, above 3000 it is like a machine gun!
Wondering if I should whip exhaust and inlet off and re seal? Any reccomendations for exhaust/inlet sealant?
I've whipped the main and pilots out and popped them in carb cleaner to soak but I doubt they are the cause.
Gave also checked crank sensor is secure and not moving.
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Gallery 6 http://www.facebook.com/media/set/?set=a.10150550640070325.430417.601005324&type=3&l=fe779b358c
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mccsp
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| posted on 13/3/14 at 12:12 AM |
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Is yur crank sensor wiring a twisted pair? If not could be getting noise issues, not sure why it would have changed.
Why do it the easy way, when I can do things my way!
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