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samfieldhouse
Firing on two.
Joined: February 11th, 2009, 12:32 am
Posts: 3324
Location: Chichester, West Sussex
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 Re: Misfiring & backfiring 160psi per side when last I tested, there's plenty of umph... wen it's working!
On the other hand I know the rings on IT are worn...
Where did you get your M4 rings Dave?
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| April 10th, 2013, 8:53 pm |
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J-dub
Aircooled Idiot
Joined: April 24th, 2010, 10:01 am
Posts: 5733
Location: Location Location
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Re: Misfiring & backfiring Russell wrote: IT, not HER FFS. Sorry sam. But +1
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1988 2cv 652cc
1993 Toyota Hilux Surf 3000cc runs on Bio Diesel
2004 Toyota Landcruiser Amazon 4200cc runs on Bio Diesel
1998 Daihatsu Hijet 1300cc
2005 Susuki Bandit 650cc
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| April 10th, 2013, 9:00 pm |
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Nelsthebass
Firing on two.
Joined: October 5th, 2009, 8:22 pm
Posts: 1415
Location: Stone, Staffs
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Re: Misfiring & backfiring If its only dribbling doesn't sound right - needs to be a nice atomised spray so suspect something is either blocking the flow to the jet or has the accelerator pump diaphragm split?
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1987 2CV Special
2014 Suzuki Swift Sport
2015 Lexus NX300h
1966 Ami Break
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| April 10th, 2013, 9:18 pm |
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dave 411
Firing on two.
Joined: August 19th, 2010, 10:44 pm
Posts: 1815
Location: Cardiff
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Re: Misfiring & backfiring Sam,they came with the pistons i bought from Ecas.
The reason I suggested a compression test was to check that an inlet valve wasnt on its way out.Worn rings wouldnt make it fluff through the carb.If you do have a semi blocked jet,it will run lean and backfire/fluff/fart/what ever through the carb.But,it could also be the coil or condenser.If you are going to fit a new condenser,mount it near the coil and extend the wire.Makes it easy to change next time.
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[img]http://i1207.photobucket.com/albums/bb480/alastairsmith999/dave411-5.png[/im
g]Horizontally Opposed
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| April 10th, 2013, 9:41 pm |
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ayjay
Firing on two.
Joined: April 27th, 2012, 6:48 pm
Posts: 709
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Re: Misfiring & backfiring Nelsthebass wrote: If its only dribbling doesn't sound right - needs to be a nice atomised spray so suspect something is either blocking the flow to the jet or has the accelerator pump diaphragm split? exactly i bet the diaphram is split if the accelerator pumps knackered/ nozzel blocked they don,t run properly and spit back thro the carb
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| April 10th, 2013, 9:53 pm |
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Russell
Firing on two.
Joined: November 29th, 2008, 10:05 pm
Posts: 9259
Location: West Sussex, U.K.
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Re: Misfiring & backfiring Accelerator pump diaphragm wouldn't cause it to pop and bang and limp along, it'd just take bastard ages to get to top speed where it'd run fine, wouldn't it? That's how split accelerator pump diaphragms have made my cars behave. I think this is more down to points, condensor or coil. I don't understand how a blocked jet or split accelerator pump will make it backfire through the carb.
But I don't know anything really, could be a jellyfish in the exhaust for all my knowledge is worth.
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samfieldhouse wrote: What I like about I2F is that there is no pretence of democracy.
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| April 10th, 2013, 10:01 pm |
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Macabry
Firing on two.
Joined: April 18th, 2010, 11:48 pm
Posts: 205
Location: Newent, Glos.
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Re: Misfiring & backfiring Nah...if it was a jellyfish there'd be more backfire, popping suggests its a mackerel problem... 
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'87 2CV Special,'78 AMI 8,'52 Anglia, '71 Capri 3000E, '67 Ford Fairlane 500 V8, '69 Ford Torino V8,'99 Xsara,'28 Ford Model A Tudor, '82 G Wagon, '68 LWB SII Landy and some manky renault Meganes.....also Ukranian KMZ MB750, Suzuki TS100,Mobylette.
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| April 10th, 2013, 10:30 pm |
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ayjay
Firing on two.
Joined: April 27th, 2012, 6:48 pm
Posts: 709
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Re: Misfiring & backfiring check it anyway, that was the same as brothers prob, operate the throttle arm whilst looking down the carb
there should be a fine squirt of fuel emmitting from the tip of little brass tube that hangs above the butterfly
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| April 10th, 2013, 11:17 pm |
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ayjay
Firing on two.
Joined: April 27th, 2012, 6:48 pm
Posts: 709
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Re: Misfiring & backfiring Russell wrote: Accelerator pump diaphragm wouldn't cause it to pop and bang and limp along, it'd just take bastard ages to get to top speed where it'd run fine, wouldn't it? That's how split accelerator pump diaphragms have made my cars behave. I think this is more down to points, condensor or coil. I don't understand how a blocked jet or split accelerator pump will make it backfire through the carb.
But I don't know anything really, could be a jellyfish in the exhaust for all my knowledge is worth. def did on brothers ak
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| April 10th, 2013, 11:18 pm |
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J-dub
Aircooled Idiot
Joined: April 24th, 2010, 10:01 am
Posts: 5733
Location: Location Location
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Re: Misfiring & backfiring Basicslly check / clean everything 
_________________
1988 2cv 652cc
1993 Toyota Hilux Surf 3000cc runs on Bio Diesel
2004 Toyota Landcruiser Amazon 4200cc runs on Bio Diesel
1998 Daihatsu Hijet 1300cc
2005 Susuki Bandit 650cc
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| April 11th, 2013, 12:21 am |
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