It may be old oxygen sensors. Here is an excellent article on the
issue. The converter is usually the victim and not the villain. So one
must also make sure the engine is properly tuned up and oxygen
sensors, if over 100K miles, considered replaced. If you can use Bosch
Planar type (such as #15738 but requires splicing old connector)
that's more resistant to contamination, use them. I'd stay away from
older thimbles or other makes like Denso.
On Jun 17, 5:22 pm, davetremblett <davetremblett.3tz...@no-
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