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Old 01-22-2003, 08:41 AM
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Does anyone know how to check cataylic converters for full or partial blockage what would be the symtoms . I have a 1994 S-10 with 4.3 engine

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Old 01-22-2003, 10:39 AM
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There are a couple of ways to check right in the driveway. first after you've been driving it leave it on and look underneath it. If she's plugged it'll be glo'in like a cherry. Otherwise first startup in the morning go out after she's been running for about fifteen minutes and grab the exhaust. Ok maybe not a good idea for some people - After the fifteen minutes Put your hand by the exhaust. If it feels extremely hot or she feels like it startin to burn after just a couple of seconds it's partially plugged. otherwise if its gettin crappy gas mileage or the truck doesn't have any balls and you can tell there's hesitation and slight jerk to it change it. Also change the O2 sensor for sure if you think the cat is plugged-sometimes that will act the same way. Either way change the sensor - you'll end up doing it no matter what.

Junior
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Old 01-22-2003, 10:59 AM
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I would change the O2 sensor if it hasn't been done recently. I have heard that they are only good for about 50,000 miles or less. They will definitely affect the cat and if not operating properly will cause the cat to get plugged up early. I have a cat on my truck that has nearly 250,000 miles on it and it is fine, but I do change the 02 sensor once in a while.
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Old 01-22-2003, 01:13 PM
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Sometimes they come apart internally, and rattle kinda sounds like a heat shield rattling. You can also use a vacuum guage to check for an exhaust restriction.
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