While driving losing power on upgrade + lose of air from front a/c outlet vents
need suggestions and complete vaccum diagram
please help
ron

 

Don't know what kind of equip you have to work with, but if you have a vacuum gauge hooked up to an intake manifold fitting you can start pinching off different vacuum lines until you find the leak. Something to check, there have been problems with the plastic vacuum reservoir cracking and that could be the problem.When pinching off the different lines/hoses you will notice a difference in idle speed when you hit the line closest to the source of the leak.

 

Yup. Just went through this. Got a vacuum tester from Harbor Freight Tools. After testing, my issue was vacuum canister leaking (common on E series vans). If it turns out to be your issue (symptoms are the same) do the following (You can't get to the canister to replace it). go to your salvage yard and get a canister out of an older Lincoln or something (soup can style). Grab some extra vacuum line while you are there. Order you a good vacuum check valve from rockauto.com based one your make, year and model. Mount the replacement canister under the hood, just under where the wiper arms are (top, center). On your vacuum line coming from the engine, unplug it at your vacuum check valve (top of engine compartment on batt side). plug in your new vacuum check valve. Run one output of valve to new canister and the other output down through your passenger side firewall (where the original vacuum line comes in at). cut your old line down by the passenger feet area and connect your replacement line up to "work" your dash controls. Done. You can use something to fish your way from inside the passenger compartment, up to and around your blower fan inside your engine compartment.