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post #1 of (permalink) Old 03-15-2000, 05:23 PM Thread Starter
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Mysterious vac hose on 83 Bronco 302 carb

I'm trying to get my son's $400 83 Bronco to pass emissions inspection.......among the variety of vacuum hoses that were either broken or disconnected all together I found one at the back of the carb (high on the carb) that has what looks like a "wing bolt"(as opposed to a wing nut) in it. I see no reference to it on the under hood diagram nor in the Hanynes manual (although I'm sure that I could have missed something in the Haynes). Does anyone have any idea where this goes? Although the "wing bolt" is the exact size of the hose (most who plug this sort of thing rarely get an exact fit and use "whatever works") I can't imagine this to be the OEM setup.

Any ideas?
Thanks in advance!
GeeAea

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post #2 of (permalink) Old 03-20-2000, 06:15 PM
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Re: Mysterious vac hose on 83 Bronco 302 carb

Well, high up on the carb could be "ported" vacuum, that's a vacuum takeoff point ABOVE the throttle plate. Ported vacuum is very low or none at idle, and increases with throttle opening. This is the opposite of regular intake manifold vacuum. Could it have gone to EGR, or part of the spark advance vacuum for the distributor?

post #3 of (permalink) Old 03-20-2000, 07:31 PM Thread Starter
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Re: Mysterious vac hose on 83 Bronco 302 carb

Thanks for the reply.....the hose seems to be attached to the carb where the fuel bowl is.......that is, I think that it would be the long way to the ported vacuum source..but you never know. Everything else appears to be where it belongs. Again this is a $400 beater in better shape than one would expect. For all I know the carb isn't the one that truly belongs on it. I'll check things out again....which isn't just going outside and looking at it since my son works and has a girlfriend .....both of which make "quality time" a rare and fleating thing[img]/wwwthreads_images/icons/smile.gif[/img]. I'll be rebuilding the carb anyway (cheap "Jiffy" kit) since the thing runs rather rich at idle and fuel dilution in the oil is a little high. Perhaps then I can get a real grip on this vacuum thingie. I haven't had to climb into an engine compartment for almost 20 years and I've "grown" since then[img]/wwwthreads_images/icons/smile.gif[/img] so I depend on the boy to do most of that now. I guess knowledge is my tool of choice at this point.

Thanks again for the reply!
GeeAea

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post #4 of (permalink) Old 03-21-2000, 05:52 PM
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Re: Mysterious vac hose on 83 Bronco 302 carb

.....the hose seems to be attached to the carb where the fuel bowl is.......

Could it be a return line? Going to the canister or the return fuel line.

Did it go together nice and easy? You did something wrong.Will have to do it again.[img]/wwwthreads_images/icons/crazy.gif[/img]
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