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ChevyTech · 06-28-2009, 11:25 AM

Yes they can plug up, or just restrict flow.

Catalytic converter test:
You can put a vacuum gauge on the engine, check the vacuum at idle, then hold the engine revved up at a steady speed and see if the vacuum drops off.

06-28-2009, 11:25 AM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: k1500 5.7l can catalytic convtr be plugged? Yes they can plug up, or just restrict flow. Catalytic converter test: You can put a vacuum gauge on the engine, check the vacuum at idle, then hold the engine revved up at a steady speed and see if the vacuum drops off.