914 smog testing, Whats required in your area? |
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914 smog testing, Whats required in your area? |
JeffBowlsby |
May 26 2016, 09:44 PM
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#1
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914 Wiring Harnesses Group: Members Posts: 8,513 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
I had to smog my DD today and noticed this sign in the waiting room, which would be applicable to the 1976 914s. Tech says they pinch off the evap system (tubing and charcoal filter between the fuel tank and air filter box) and insert some kind of gas under low pressure to test the evap system, for leaks.
What other testing is required in your area, if any? Attached thumbnail(s) |
jcd914 |
May 26 2016, 10:17 PM
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#2
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
I'm in Sacramento CA and I had to deal with this Evap system testing on my 93 Audi S4, 78 VW Bus and a 77 Motor home.
Both the Motor home and the bus failed and I had to trace down and repair the leaks. In both cases it was small holes in the fuel fill hose/fitting between gas cap and tank. Bus was a $75 special order elbow from VW, motor home was $10 worth of Gates 1 1/4" fuel hose from Riley's. One of the frustrations I had was there are no published specifications (that I could find) for the leak test. The tester seems to be the only thing that knows how much pressure loss is allowable. They started pressure testing fuel caps before they started pressure testing the whole system and I had 2 caps that failed. They test the cap and/or evap system last, after the whole dyno run and then if it fails you have to come back and go thru the whole dyno run again before you find out if your fix worked. Jim |
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