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post #1 of (permalink) Old 01-18-2000, 12:15 AM
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stock carb vacumn

I had a 78 vette with a hp 350 the vettes are controlled primarily by vacumn I always had problems with lights ,ac/heater anything to do with vacumn.I was told after I sold the car by putting a larger cam I lost most of the vacumn.Now for the main question if the stock carb secondary works off vacumn what all could possibly cause it not to open when needed or open but not completely?I've done some work to the stock 1.3(5 way ported the heads,headers 2 1/2 exhaust blinded the egr valve,ported out the intake and spacer not to have any problems with fuel flow.But for the most part still stock.What else can cause me problems?

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post #2 of (permalink) Old 01-18-2000, 03:53 PM
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Re: stock carb vacumn

What I'd do is hook up a hand vacuum pump, measure how much vacuum it takes to get the secondary fully open, and keep the vacuum on it to see if it leaks down... When you have measured the amount of vacuum that it takes to fully open the secondary, hook up a vacuum guage on the engine, and drive the vehicle, and see if you are getting enough vacuum to properly operate the vacuum secondary... The problem might be the vacuum mechanism on the carb itself? A vacuum leak anywhere in there could cause you to lose enough vacuum so that it won't work right... Assuming that there's a rubber vacuum line that goes to it make sure to check it for cracks or wear that could cause it not to hold vacuum.. hope that helps...


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