Does anyone have a vacuum diagram( or pics) for a 2005 Suburban? I have a sucking sound when stepping on the gas. The truck revs at idle at 750 rpms and doesn't seem to be idling rough. There is just a sucking sound when stepping on the gas and a nano second delay. I've checked the filter box and hoses to the throttle body and they seem ok. All clamps secure and no hole in tubes. I want to trace the vacuum lines to check . Thanks.

 

The best way to find a vacuum leak is to move all the hoses, look for brittle/cracked hoses and listen for the sucking sound while moving the hoses.

 

I don't understand why a vacuum gauge is not used as they used to be before OBD became a thing. A vacuum gauge is still quite a good item to have on hand, IMO.
I have heard some people claim there isn't a good hookup point, but that's nonsense. You can always find a place to hook it up with an adapter if you need to.

 

Probably because it is cheaper to leave it off and most people don't understand how to use a vacuum gauge.

 

Damn, I am getting old!!!!

 

Me too!!!!!!!!