If a vacuum leak causes a lean condition, would saying the opposite hold true?

Scott

 

It would make sense... if it was right but had a vacuum leak, then fixing it should make it run rich.

 

I don't get the question, but if you fix your vacuum leak you won't run lean anymore.

 

I guess I didn't word that right.

What I meant was, if you didn't have enough vacuum, would you run rich.

Vacuum leak usually means extra air in the system right, so would a blockage do the opposite?

 

A blockage would mean the system is functioning as it is supposed to.

All vacuum is is the draw of air (in this instance) from the high pressure area to the low pressure area.

A vacuum leak means that air is getting into the system via an unmetered source. If there are no leaks, then the only source of air is the metered, and as such, the system runs as it should.

In the perfect system, the intake lets in "x" amount of air. For that set amount, there is "y" amount of fuel. When there is a vacuum leak, "x + x1" air gets in, still, per "y" fuel. That added air creates the lean situation. If you ensure that all leaks are sealed and whatnot, that leaves it to the "x" to "y" ratio.

 

and dont forget the square root of q to the power of xz(3) because without that, you'll be in one heck of a mess.. j/k... very correctly stated, if your engine has a vac leak its drawing in more air than just the air from your aircleaner, so, it is messing up the air/fuel ratio...

 

Thanks.

The reason that popped into my head is because I recently had my brake hoses replaced because thay had collapsed internally.

Since we're on the subject...
How and where do you check engine vacuum?

 

Vacuum gauge plugged into a manifold source is what I do. Turn the engine on and watch the gauge.

Helps to know the cam so you can get a general idea of how much vacuum you should be pulling.

 

Thanks.

Stock but I do have 1:6 rockers