1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

A stock 12A should have a idle vacuum of...

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Old 09-09-07, 02:01 AM
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A stock 12A should have a idle vacuum of...

what? I got around 10 in Hg with a five degree deflection. both ways. Should the vacuum be steady?

thank you
Old 09-09-07, 08:20 AM
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That's pretty low.
Old 09-09-07, 11:46 AM
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it may make a difference where you put the vacuum line. i did some testing, with the vacuum guage teed into the distributor vacuum lines.

i was seeing 15ish, steady.
Old 09-09-07, 01:02 PM
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so is off the dizzy vac lines an accepted place? and what does low vacuum mean. other than a leak.
Old 09-09-07, 01:21 PM
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It could mean weak springs or worn seals. Maybe chrome flaking.
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