I think I may need some more help. To catch you up, the vacuum leak was
coming from the pcv valve boot on the side against the manifold. It
made the appearance that smoke was coming from the plenum gasket during
the smoke test, but I still would have had to remove the manifold anyway
to access it.
After several days of collecting the right tools (adjustable torque
wrench for example) and other things, I replaced the pcv valve, boot and
tube today along with the plenum gasket and reassembled the manifold.
Now, I don't know what to think. The scanner is now reading high long
term fuel trims, but negative short term. After a 10 min ride, the
short term trims ranged from about 0 to -5, long terms decreased
slightly from +25 to +10 to +15. When the car sits idle, it seems like
a cycle where it almost stalls every minute or so, then something clicks
and it's ok again. Didn't have this behavior before the change of
I tried clearing the data several times with the scanner, but never have
disconnected the battery.
These new short term fuel trims have me scratching my head once again,
having gone from +25 before the valve was replaced, then starting off at
-18 or so, then 0 to -5 after a 20 min ride with long terms deceasing to
about half of what they were.
Any ideas would be appreciated. Could it be as simple as having to
drive the car for a while to get the values back to normal? Wishful