JeffHs
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| posted on 16/4/10 at 03:05 PM |
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Strange misfire
Any ideas?
Pinto DGAV with K&N in the airflow, FR32 cam, Aldon dizzy. Has just developed a dreadful misfire. Seems to be ok with engine cold but as soon as
it warms up (5 miles or so) it won't rev past 3k with an open throttle. It misfires badly like a harsh rev limiter effect and can be switched on
and off by opening and closing the throttle. Doesn't get any better after distance - I've just done about 50 miles and it's still
the same. Tried driving in 2nd gear and with very light throttle could get revs up to 6k but any further throttle opening, at any point in the rev
range, leads to a dead cut that recovers as soon as the throtle is closed but if the throttle is left open it just winds down and won't pick
up.
I thought it could be carb icing but left it running and reproduced misfire when stationary - the throttle venturi is warmish on it's heated
manifold so seems unlikely.
The car seems happy to go all day as long as you don't floor it - might be good for economy and speed limits but no fun at all!
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IanBrace
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| posted on 16/4/10 at 03:45 PM |
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Blocked main jet or accelerator pump diaphram split?
www.aerialphotography.org.uk
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turbodisplay
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| posted on 16/4/10 at 03:57 PM |
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Assuming fuel is flowing ok i bet it is an ignition fault. Whenthe throttle is open the VE is high, so the spark cannot jump the gap.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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britishtrident
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| posted on 16/4/10 at 04:08 PM |
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Classic fuel problem symptoms.
Start by removing and clearing the main jets,
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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adithorp
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| posted on 16/4/10 at 05:58 PM |
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Also check your valve clearences. Too tight and you'd get those sort of symptoms.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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jacko
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| posted on 16/4/10 at 09:01 PM |
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quote:
Originally posted by adithorp
Also check your valve clearences. Too tight and you'd get those sort of symptoms.
adrian
Im with this Adrian on this one
Jacko
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