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  1. W

    91 3fe o2 sensor locations

    I appreciate the help but there are no cats. It comes from both manifolds then Y'd into 1 pipe, 1 muffler and turned down directly in front of the axle. Thanks
  2. W

    91 3fe o2 sensor locations

    In an effort to get my 91 running as good as it can I want to install new o2 sensors. The problem is the PO had a "custom" exhaust made and removed the o2 sensors in the process. I have located one of the plugs, but am having a hard time finding the other. I have new sensors and weld in...
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