Brake Booster Vacuum leak

[tuzzio]

I'm stumped.
So, I noticed as of recently my car idles super rich at idle. I thought it was weird when I adjusted the warm up enrichment table on my aem v2 my wideband read no effects.

I then noticed that anytime I depress the brake pedal, it gets leaner towards a happy 14ish range for idle.

I further noticed pumping the brakes makes it even more betterer.

So the other night I got home, pulled the line off the brake booster, put a bolt in it and started the car. Boom, it was happyish. (could definitely use a little refining in the tune which im fine with)

Today I went and scooped a new to me, used booster. Painted it all nice and shiny black and installed it. Still, with the same results.

Is it possible that both boosters are bad? Sure.

What I thought was weird is how after the car is off if you pull the booster line off, you can hear it alleviate the air pressure out, (the old one did this as well) which to me tells me its not leaking.

I tried to reverse the check valve. All it did was make my pedal immensely stiff and didn't change my afr.

For what its worth, s13, non abs.

[jedi03]

sounds like tune...when you depress the pedal it uses the vacuum to assist the pressure put on the brakes to make the pedal effort easier...

[zombiewolf513]

Check the vacuum line and the check valve for cracks. Had this same problem a while back