Where is the vacuum port on 3.0L???

[Bilgamesh]

I recently purchased a '98 Regal with the GM 3.0L engine. The engine has about 8 hours on it, and is idling a little high. When I do the first oil change I plan to set the idle mixture with a vacuum gauge. I understand there is a vacuum port on the intake I can use to do this, but it is not obvious to me where it is. Can anyone give me a description of where to find it? - Thanks

 

[Bt Doctur]

Re: Where is the vacuum port on 3.0L???

There is no vac port shown in the manuals. Why not the idle drop method.
close gently untill it stumbles, open slowly untill it runs smooth, add a 1/2 turn richer(out)

 

[Bilgamesh]

Re: Where is the vacuum port on 3.0L???

There is no vac port shown in the manuals. Why not the idle drop method.
close gently untill it stumbles, open slowly untill it runs smooth, add a 1/2 turn richer(out)

That sounds like my only option. I was hoping for something more objective like a precise needle indication rather than my untrained eyes and ears. Can I assume this is done in neutral, warm and at 700 RPM? Thank You!

 

[Bilgamesh]

Re: Where is the vacuum port on 3.0L???

That sounds like my only option. I was hoping for something more objective like a precise needle indication rather than my untrained eyes and ears. Can I assume this is done in neutral, warm and at 700 RPM? Thank You!

I currently have it set about 1.5 turns out. Isn't this normally close? - Thanks

 

[Bondo]

Re: Where is the vacuum port on 3.0L???

I currently have it set about 1.5 turns out. Isn't this normally close?

Yes...