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vacuum leak?


Guest Anonymous

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Guest Anonymous

Hey everyone,

 

it's been a while since I have been on, but school and work have been kicking my butt. Anyway, just installed msd into my car, I LOVE IT. I was toying with a turbo eclipse, he never did get the hint that he was slow, until he almost rolled his car trying to turn at 70mph. Anyway, he realized it then. What i was wondering guys and gals, is I thought I remembered reading somewhere that one way you can tell you have a vacuum leak is by pulling the air cleaner and putting your hands over the carb inlet, if your car dies, then you don't have a leak, but if the car starts to run nicely, then you have one. Let me know if my thoughts are correct here. If they are, anyone have any advice on how to find my leak? I want to tune the carb and everything nicely since the msd has a vaccum advance that really works this time(HEI was broken). Also, if I set my inital timing with the dist unplugged at 10, and then when I plug it in it's at 25 does this mean the dist is 15 degrees advanced timing built in? If so, is this setting appropriate? My idle speed is at 650.

 

Sean

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Guest Anonymous

Thats correct. It'll run smoother when its cupped off and not allowed air. The air will still go in through the leak you would have causing the fuel mixture to be more normal and so it'll run smoothly.

 

To find the leak, get some berrymans chemtool (wd40 probably would work as well) and put the nozzle on the can. With the engine running, squirt it around the base of the carb and along the intake manifold while listening. When you hear the rpms come up you've found the leak, fix it accordingly. This method works real good and you'll find the leak assuming you can get the liquid squirted into where its at. Usuall the carb base or the manifold gasket though is suspect.

 

Kids don't try this at home, but I actually repaired a vega's intake leak one time by finding the leak, squirting some silicone in the hole, slowly cranking the engine over until the silicone was sucked into the hole, I think filled the hole again and let it dry. Worked fine and didn't have to pull the intake, although this will of course cause a bit of silicone to stick into the intake port runner if you get very exuberant with the stuff. :D

 

Regards,

 

Lone

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That's a new one I've not heard of....

 

How the heck does the engine run when you block off the carb air inlet?? So you have a vacuum leak somewhere else, how would the engine get fuel to keep running? I'm guessing it's air flow through the venturi that supplies the fuel - block the air, you stop the fuel?

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