With the OVP removed, your car will have no power to the FI computer and certain other control circuits. That means it will run open circuit, fail-safe mode. Emissions will likely be high, and driveability will suffer. If you are noticing no difference, your mechanical adjustment is probably slightly rich, and you will fail any smog testing. Cold weather problems will occur too.

OTOH, you should check if a PO has already jumpered around the OVP.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7