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Survey: How long does a Cat last? 200


So I've been tinkering with this issue of a metallic, pinging type sound on acceleration... No it's NOT ignition knock, or fuel knock/ping, I've certainly heard that before... My car is in great running shape, and I can't seem to figure this out. It's only when the car is moving (i.e. not just revving) and usually happens between 2500-3200 RPM.
So here is the question: Could it be my catalytic converter (my best idea...) and also, how long do Cats typically last under fairly normal driving conditions (no racing (ha), no serious fuel/engine problems etc.)


Any help is greatly appreciated!

Best,
--
Spencer 1992 244 190K : Bosch LH 2.4 Jetronic FI






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