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I'm not sure what could be causing your boost issue, but my first guess is a boost leak. The stock
gauge can get stuck in one position (mine has), and you're correct it would be in the middle (0) if
the vacuum hose was disconnected. Do you have access to a boost leak tester?
197 ohms is definitely a bad injector. It's not uncommon for a failing injector to fire, but not all the
time or for the correct duration. They need to be between 10 and 14 ohms to work properly. I'm
guessing you have a lumpy idle and maybe some hesitation at WOT? If so, those are probably
caused by this injector.
Are you using Nissan Datascan to read your sensors via the ECU? If so, it sounds like you're
looking at the A/F BASE, which is the ECU's "target" A/F ratio, not what it's actually reading.
Since our cars have narrow-band sensors, they can't actually read the A/F ratio, but they can
determine if it's running too lean or rich. If you're using NDS, configure it to display the O2 Sensor
and O2 Sensor Right, so you can read what your O2s are indicating.
I could be wrong, but I BELIEVE the O2 sensors should show rich under acceleration, lean under
deceleration, and should bounce back and forth (at least 5 times within 10 seconds) while
cruising.Your timing seems normal, the ECU constantly adjusts it depending on load and RPM. If you're
checking out NDS, it should display 15* at idle, as should be indicated by a timing light at the
same time.
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