Finally found that vacuum leak
#1
Racer
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Join Date: Mar 2009
Location: Tucson, AZ
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Finally found that vacuum leak
After two years of slowly searching, pressure testing while spraying Snoop leak detector or soapy water, pinching off lines with a guage attached in different spots and generally praying to the Prosche Gods I found it. I was getting ready to install my new Laust vac manifold when I pulled out the recirc valve and blew into the pressure side. Not the first time I've done this but why not? It leaked a little. In went the forge knock off that has been sitting on a shelf for a year now. I decided it would be best to only change one thing at a time and make sure it was going to work. 18-20 inHg was showing at idle this morning during a really nice drive into work. Happy day! Now onto that manifold.
#5
Racer
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Power was good. Boost seemed to max out at about 10 psi though. I am curious to see how the plugs look after a week of driving it. They always looked too dark and oily to me.
#7
Nordschleife Master
You can use your mouth to do this ... just don't spit up into the valve... hah.
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#10
Racer
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Yeah, the round guy, with the vac hose coming off the top, plugged into the Jboot.
Just the low vac readings and boost loss. I suspect the diaphragm leaked and I never knew it. Iirc I never pinched off just the line to the valve. Because I could push air through the valve on the pressure side with my mouth (about 1 or 2 psi) I know it had to be bleading boost.
Just the low vac readings and boost loss. I suspect the diaphragm leaked and I never knew it. Iirc I never pinched off just the line to the valve. Because I could push air through the valve on the pressure side with my mouth (about 1 or 2 psi) I know it had to be bleading boost.