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Thread: 4ac weber issues

  1. #21
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    From what you describe its definitely a fuel issue & first things first the solenoid needs fixing in some way or another, if power is applied to the solonoid it should make a knocking type noise / feel as the pin is retracted back inside the housing & bottoms out .. I have come across cars in the past that have blown the fuse to the solenoid or the solenoid is playing up & once warmed up behaves exactly the same way you are describing .. You say the pin appears to be sliced ?? or cut .. When wiring up the solonoid the power wire for the solenoid comes from the same power source of the choke .. As I mentioned shit in the idle circuit will also have a similar effect, but you need to fix the solenoid first as both cases have the same result ..

  2. #22
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    Yeah solenoid has been cut. And when applying 12v there's nothing so it's definitely broken
    I'm not even sure which wire is for the old choke since I never had a stock 4ac carb. Ill google it

  3. #23
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    If the solenoid appears to be cut, ( so there is no point left now ?? ) If its cut it sounds like you might have some dirt in the carby causing the fault, you can cheat a bit by taking out the idle air mixture screw & blowing compressed air back into the carby, don't use to high a pressure though as you don't want to blow off any blanking plugs within the carby & re fit & try that, saves pulling the carby apart .. Also sometimes what works is to get the car running & have a rag in your hand & bring the revs up pretty high & then cover the top air horn of the carby completely & the vacuum created can sometimes draw through any muck, it will obviously bog down quickly & try to stall so take off the rag before it stalls & do it again, also when the rag is on i sometimes let the throttle off so the vacuum is directed through the transition / idle fuel ports ..
    Last edited by Lexsmaz; 25th July 2013 at 09:23 PM.

  4. #24
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  5. #25
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    I know the physics of the solenoid (from school lol) but have no idea what I'm really looking at

  6. #26
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    Thats the second type of Solonoid I mentioned, it has the needle internally within that unit in your hand, so its not cut that's how they look, the small bit on the end is actually a idle fuel jet, I cant remember but you might / should be able to pull the Jet off , ( the bit on the tip down to the thread ) if you can get the jet off there should be a needle inside as I mentioned before & just cut 5 - 10 mm or so off the tip of the needle & re-assemble if you cant get it to come off it might be time to get a New solenoid, ( needs to be the same type though ) .. I haven't come across this type for years so cant remember wether it can be fixed / modified or not ?? .. Before you try pulling it apart & playing with it check its actual operation, while its in your hand, earth the body & apply 12 volts to the terminal & if its working you should feel it thump / Click, also try blowing into the hole at the end with your mouth & with no power applied nothing should happen, no air going any where & then apply 12 volts as mentioned & you should feel your breath come out through the little hole on the side ( the hole near the start of the thread ) thats if its working well ..
    Last edited by Lexsmaz; 26th July 2013 at 02:02 AM.

  7. #27
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    Pretty sure it isn't operational but I got the jet off with pliers and it looks like it has been cut (with scissors or something). But is the idea to cut it so it doesn't impact the jet? I'm slightly confused

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  8. #28
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    Certainly looks cut .. Yes the idea is to cut it so that even if the solenoid dies & doesn't withdraw the pin as its cut it wont interrupt the fuel flow .. Maybe file it flat on the end wont hurt, also see if you can jam the cut plunger into the housing with a bit of thin metal or such saves it flopping about as you corner etc ... But sounds like you probably have a blockage issue in the idle jet of your carby, whilst you have the solenoid off & the jet off the end, blow out the jet with compressed air & also take out the solenoid plunger & clean inside that to incase there is some loose stuff in there too .. And then you can blow lightly with compressed air through the hole where the solenoid screws into & also as mentioned take out the idle screw & blow through there too with compressed air, but not to heavy handed on the air pressure, refit it all & see how it goes from there ..

  9. #29
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    Hey Terry, sorry to bother you again but think you could send me some pics of what you've done with your throttle cable mount? I've hacked the old one to pieces and I'm mounting it off the brake booster bolt. I'm just using it as a template before I make a decent looking mount out of some steel but I can't seem to get it right :/

  10. #30
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    TOFUTERRY

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