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If there is a resistor, best bet is checking around that area of the harness. You don't necessarily need to ground using one in the harness, so if you find some random ground wire that doesn't belong, you may want to chase it down. But if there is a resistor wired in, unless it shit the bed it wouldn't be running rich.
Since it's throwing a code 55, you may want to look other places. How rich are you running, do you have a wideband to give an exact number? Either way, fix the knock sensor issue before you move forward, that way you know you've got that issue resolved, and if you continue to have issues of running too rich, you know it's somewhere else in the system.
..how much of the original emissions system is still in use on the engine?
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