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Old 05-15-2018, 02:15 AM   #1
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Join Date: Jun 2015
Location: Buffalo, NY
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Vacuum Reading at Canister

I think I located my vacuum leak!

I found the diaphragm that controls the coolant changeover at the transmission was not holding.

After capping the valve, the vacuum readings went from -8 to -19 at 800 rpm idle.
Is -19 a good value?

Hoping this fixes my codes once and for all!

Also - Will it take time for the PCM to relearn Fuel Trim, etc after the battery was reconnected?


2002 Porsche Boxster Carrara White - 103,000 miles
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Old 05-16-2018, 04:17 PM   #2
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-19 should be fine. I fixed lots of leaks and had a leaking reservoir as well. I got around-19 when done and all the codes went away and the OBD2 monitors reset.

1973 Carreras RS tribute
2000 Saab Aero wagon stick
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