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new wiring harness, new problems 200

Fuel pump and O2 sensor should not be related to the wiring harness. Check your vacuum lines for hidden cracks and failures -- might have gotten pinched when the harness was replaced. Check timing, mixture, idle air pump, etc -- everything covered in a major tuneup.

My '82 240 has 330K miles. It ran a whole lot better after I replaced all engine bay wires that had bad insulation and all vacuum lines and fittings. Perhaps that's what your '84 needs.
--
-- Bruce / '82 244 (323k miles!), '86 745, '87 760Ti, '94 854






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