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Old 02-21-2003, 08:14 PM
ctaylor738 ctaylor738 is offline
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Join Date: Apr 2000
Location: Falls Church, VA
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Could a malfunctioning O2 sensor cause a 3x HC problem? Don't think it can swing it that far. This is more like a misfire and unburned fuel getting into the exhaust.

Given that the problem gets better as the RPM's come up, suggest vacuum leak caused by injector seal(s) causing a lean misfire at idle. Could also be plugs, wire, cap, etc.
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