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Old 08-10-2019, 10:47 AM
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smj999smj smj999smj is offline
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2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
 
Join Date: Jun 2012
Location: Prospect, VA
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A gutted upstream converter won't cause the bogging, but it will cause the ECM to trigger catalyst efficiency unless it is tricked by CEl eliminators or spacers on the rear O2 sensors. If there is a downstream converter, there is a possibility that the rear converter is clogged or restricted. An exhaust back-pressure test would show if that's an issue. There should be catalyst substrate in the upstream converter/manifold between the front and rear O2 sensors. That could be the issue, but it could be something else. If it is gutted, one would have to ask why that was done? Maybe the engine is running rich...or even burning oil? Is the fuel pressure too high? You many need to do more diagnostics and some testing may require a scan tool that can read live engine data. At the very least, you should contact the selling dealer if the converter has indeed been gutted, as they can get into legal trouble for that, which is considered "tampering with a federally controlled emission device."
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