Possible vacuum leak? (Running lean and high fuel trims)
 

Hi guys. So to preface, I was at a drifting event last weekend when this issue first appeared. After I spun out once the car had trouble starting again (this is kinda normal, so I wasn't worried about it). However, after I exited the track and was looking at some stats like AFR and fuel trims, they went crazy.

Now, almost a week later, the issue has still not resolved itself. My AFR is consistently between ~18 and 20:1 and my fuel trims are +35%. I flashed the stock tune back and the car won't even run right. It will start and then die almost immediately unless I give it gas to keep the RPM's up.

I took it to the dealership today but they told me they couldn't do anything until tomorrow morning. So I figured I would ask you guys before actually taking it to them to see if I can figure it out myself.

Notes:
The car is NOT boosted
Using an edited OFT tune
MAF is scaled properly

Check the Evap line under the intake manifold. I know your not boosted. but my car acted the exact same way when the line popped off.(I am boosted) the line is on very loose from the factory.

https://gyazo.com/986d0413da2403d426a16f100f31a672.png

One of these lines?

Noo reach your hand under the intake manifold behind the ac compressor and feel around

Sent from my SPH-L720T using Tapatalk

That's exactly what it was. Right underneath the manifold there was a line that came off :)

Thanks!

Sweet glad I can help...Look out NA guys! everyone needs to clamp them now..I still need to put hose clamps on mine. they come off often.

I apologize for reviving this post but where are each of the locations a vacuum leak can occur? I am going to check the hose behind the AC compressor later today to see if it is my issue. I hear the noise but can't locate where its coming from over the sound of the engine.

My setup has the Edelbrock Supercharger.