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if smog checks are required, you should install the o2. if not i wouldnt bother. the FV needs to be working though. i dont know how much of the wiring is missing, but if that valve is not buzzing the car wont run right.
if you want to get fancy, since youre already working on the o2 system, install a wideband o2 controller, then you could send the simulated narrow band signal to the ecu and have more precise control over mixture. cis runs lean
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Jason
81 SC
97 328is
87 Jeep Comanche (RIP)
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