bigsyke Posted March 1, 2010 Share Posted March 1, 2010 Has anybody with a VG30i completely disconnected their primary o2 sensor? I know some people have done this to stabilize FI with a fouled o2 sensor on an LS1. I have no PCV valve, running VTA so its running rich with the lack of the unmetered leak it seems. IIRC a cruise control vac line was unhooked when I got about 21 mpg, now with it connected its 8mpg. Link to comment Share on other sites More sharing options...
silverton Posted March 1, 2010 Share Posted March 1, 2010 the VG30i should only run one O2 sensor, and as far as I know, is needed for the computer to properly administer the proper fuel mixture. if you're only getting 8mpg, you have other big issues that should be fixed and not covered with a band-aid. Link to comment Share on other sites More sharing options...
Precise1 Posted March 2, 2010 Share Posted March 2, 2010 It could be the O2 sensor failing but the first thing I would do is check the ECU codes for fault codes. B Link to comment Share on other sites More sharing options...
BowTied Posted March 2, 2010 Share Posted March 2, 2010 Have you added a turbo? Why are you are VTA instead of using a PCV? Link to comment Share on other sites More sharing options...
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