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I have a torn diaphragm on my hooter valve..... Posted by MI-Roger [Email] ![]() ![]() |
My wife laughed out loud when I emerged from the garage with that declaration.
A big thanks to JMS for mentioning loss of vacuum as a possible cause for suddenly reduced fuel mileage. That, and a recent perceived reduction in performance, led me to examine the valve as a likely candidate for both problems.
I removed the valve, connected it to my MityVac, peered into the side port, and pumped the MityVac twice. The valve opened half way, then drifted closed. Pumping the MityVac four times opened the valve fully and it stayed open. My conclusion was: there is a vacuum leak, it isn't in the hand pump or tubing, and that apparently the diaphragm hole/tear is blanked off when the valve is fully stroked.
I will soon be the proud owner of a Forge #FMDVRA by-pass valve. I went with Forge's diaphragm style rather than piston because it operates faster, doesn't require annual greasing or service, is repairable if the diaphragm tears, and this one can be modified with other spring rates if I "chip" my car.
I hope it arrives soon.
posted by 68.40.14...
_______________________________________ Saabs owned: 2008 9-5 Aero Sedan, sold at 227K miles 2006 9-3SC 2.0T - Wife's daily driver 2000 Viggen Convertible - Sold May, 2022 1964 Quantum IV Formula Car - Retirement project 2000 9-5lpt Sedan, sold at 318K miles
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