Vacuum Leak/Hissing Sound

[hakanerdogan]

Well, nowadays I hear a hissing sound around throttle body. I tried to locate it by using old school methods but in vain. To be honest I am also not sure whether this sound is normal or a sign of vacuum leak.
I have a O2 SES light most probably due to lean condition.
And temporary power loss uphill climbs.

Any ideas welcomed. How do I detect it? Or ıts a normal sound?

https://youtu.be/K3UuttITAiI

[MisterH]

Couldn't really hear anything unusual from your video. Did you spray around the intake with starting fluid, or propane? What 02 sensor code are you getting? A failing upstream sensor will affect the running condition.

[hakanerdogan]

Yea I did spray a starter fluid, almost whole can which actually made me afraid may could catch fire, that much

If you say that vacuum sound is normal I will search the problem at O2 sensors. I am getting P0150 and P0130. I think P0130 is before cats, which is important as you said.

The performance problem I have is only uphill when the vehicle is under load. Not sure an O2 sensor cause that?

Thanks.

[MisterH]

I didn't say a vacuum sound is normal, I said I couldn't hear anything unusual in the audio portion of the video. If you have an upstream CAT error it will most definitely affect the performance under high load conditions, and going uphill is a good example of that.+