Catalytic Converter testing
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Fleet Mechanic
Joined: Aug 2004
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From: NE Tennessee
Catalytic Converter testing
Is there a way to check if a CC is bad by using a IR (temp) gun on it and the muffler to see if there is too much back pressure? I checked the site but didn't see this info if its feasible. If its possible does anyone know what kind of numbers I should be looking for? Does it vary too much from different vehicles and CC's?
My wife's astro is a city vehicle with little highway miles (almost all city @ 160,000 miles) with a noisy CC and she thinks its bad. I can push with my hand on the CC and the rattling eases up so I figure a heat shield or something inside. But my '92 E-350 has a special oval hookup to the exhaust and will be a bit of a pain to by-pass to check Why they bottle necked these down to 2 1/4" after the CC is beyond me.
My wife's astro is a city vehicle with little highway miles (almost all city @ 160,000 miles) with a noisy CC and she thinks its bad. I can push with my hand on the CC and the rattling eases up so I figure a heat shield or something inside. But my '92 E-350 has a special oval hookup to the exhaust and will be a bit of a pain to by-pass to check Why they bottle necked these down to 2 1/4" after the CC is beyond me.
Senior User
Joined: Nov 2014
Posts: 329
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Yes - normally cat con outlet temps should be roughly0-50 F higher than inlet. If the cat con is plugged, the inlet will be higher then outlet. When I checked mine temps were like 350 in 360 out according to my fuzzy memory.
No clue if this woks for mufflers.
No clue if this woks for mufflers.
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FarmTruck93
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Feb 10, 2017 04:59 PM
