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The testing I did through the pop off valve and the vacuum line off the distributor should be sufficient, no ?
I did the test around the airbox lid because I was just curious how tight of a seal it created. I know it is not supposed to be air-tight, but I wasn’t sure if my lid was warped or not.
My 74 doesn’t have a brake booster.
I’m new to Porsches, but everything I’ve read so far definitely recommends replacing injector O-rings if they are leaking or suspected. Even the how-to article for doing a smoke test on this site uses this as an example. I’ll be replacing them, quick and cheap reassurance.
I believe when I redo the test after replacing the o-rings I'm going to use the plug on the driver side of the airbox. That way I can also test the pop off valve o-ring and lid to make sure it is sealing. When testing through the POV itself there was no leaking around the epoxy at the base.
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1974 911 Targa
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