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Author Topic: vacume question  (Read 2322 times)

Offline achevy1978

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vacume question
« on: October 14, 2013, 09:46:33 pm »
hi
my vac advance off the dist goes to the left front of quadrajet. i pulled it off to check timing
after changing intake gaskets and there seems to be no vacume, engine does not increase in rpm when i take it off... i sprayed carb cleaner around manifold  and no rpm change.
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Offline Boone83K10

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Re: vacume question
« Reply #1 on: October 15, 2013, 07:44:23 am »
vacuum advance is usually on a ported vacuum source, on at least 95% of street engines. Ported vacuum is closed off at idle. That is why RPM didn't change.
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Offline Irish_Alley

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Re: vacume question
« Reply #2 on: October 16, 2013, 12:24:18 am »
what boon said. also most people on here say to to move it to another port if you can. the ported advance is more for emissions
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