Re: How to tell if cat convertor clogged?

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Re: How to tell if cat convertor clogged?[1800/71] posted by Tom Irwin on
Monday, 23 August 1999, at 9:52 p.m.

Test the vacuum while the engine is running...run it up to ~3,000 RPM and let the throttle snap back closed. You should see the gauge pop up to ~25-26 mm hg. If it kinda meanders around...you could have a nasty cat.

Or, if you are intimately familiar with this car, you should be able to feel a lack of flow at the tail pipe, maybe a whistle or whooshing sound too.

Tom
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Tom Irwin '95 960 '94 940 Los Angeles, CA

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