Vacuum advance, ported or manifold, age old question answered

noquarterMember

I found this chart on the web, two map sensors and a throttle position sensor clearly shows that except at idle, ported and manifold vacuum is the same. So when you need to decide whether to use ported or manifold vacuum, let your idle decide. If vacuum advance helps your idle and doesn't make it hard to start, go directly to manifold. If the additional advance makes starting hard, use ported vacuum instead.

Now all we need to sort out is the meaning of life...

Vacuum Chart

3/18/1212:07 AM

Original Post

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