What’s your engine vacuum range for 3.4 motor?

Just wondering what engine vacuum most of you are pulling with the
3.4 motor?

I’m at 15in and deceleration at 18in max at 6000 feet.

Is that normal? Because I saw another member at 21in at idle at my same altitude

 

I don't think I've ever seen 21 at an idle, on any vehicle.

 

What numbers do you pull.

This was the other members numbers at idle and I thought it was to high that’s why I was curious

 

That's with in normal idle range (18-22) there are many things that can affect idle vac. readings. I would only be concerned with lower than normal vacuum readings.

 

Yea but want to know what people with 3.4 motors are actually are seeing

 

I see 20-21 at idle. If I sit there for a while it’ll drop to 19 sometimes. Decel goes to below that.

 

Ok I don't know what to tell you but what you are seeing is not important. Manifold pressure is affected by things like the AC kicking on, the truck being put in gear, the AC switching on, load on the electrical system etc. Start to worry when it really drops valve issues, timing sensors, leaking intake, dirty airfilers full of a mouse nest, plugged cats, etc. When a modern vehicle decals they dump air into the intake system to reduce emissions.