Catalytic Converters
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Senior User
Joined: Apr 2002
Posts: 431
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From: Winnipeg Canada
Catalytic Converters
How do I know if the cats are clogged? Im going to do a tune up right awa y but the truck just seems to have a lack of power. It may be that im just not used to the automatic transmission but my brother's 02 4.6 seems to have quite a bit more power throughout the powerband than my 04. I dont nesessarily stomp on the pedal. to tell you the truth i kinda drive like a granny, but off stop lights i have to go almost 3/4 throttle or more just to accellerate to 60 km/h and even then the cars beside me are still passing me. my old 4.2 seemed to have more power than this thing. :S it doesn't stumble hesitate or miss at all and the fuel mileage seems okay (about 12.5 mpg canadian in the city) but there just seems like there is no "umph" to this thing
**edit** i should add that we do not have emissions testing here and i have no MIL. even during KOER tests there are no codes. Im trying to think of tests i can perform without having to either replace parts and seat of the pants test or hollow out the catalytic converters. I should also add that the truck has about 327,000 km (i think thats around 204,375 miles) on an 04.
**edit** i should add that we do not have emissions testing here and i have no MIL. even during KOER tests there are no codes. Im trying to think of tests i can perform without having to either replace parts and seat of the pants test or hollow out the catalytic converters. I should also add that the truck has about 327,000 km (i think thats around 204,375 miles) on an 04.
Post Fiend
Joined: Aug 2006
Posts: 20,099
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From: Yorkton Sask
i'm not sure if the '04-up 4.6's have the drive-by-wire system that the 5.4's do, but if so, that will make it feel a little less responsive. with that kind of mileage i wouldn't doubt that the converters are getting a little on the full/plugged side. i don't know of any tests other than removing them and doing without, or just replace them with 2 high-flow converters. if you're doing that, go true duals with an X or H pipe.... much better than the Y pipe system on there now...
New User
Joined: Feb 2009
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From: I live in Minnesota
Posting Guru
Joined: Jan 2008
Posts: 1,048
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From: altoona
well i know of two good ways to test the cat's one start the truck and see how much exhaust is come out, if it seem to come out very slow or almost not at all its pluged, or drive around a good bit and get under the truck and see if they are glowing red hot which is another sign of plug cats
Post Fiend
Joined: Aug 2006
Posts: 20,099
Likes: 7
From: Yorkton Sask
just out of curiosity, i wonder if they're the same temp as the rest of the exhaust system if they're operating normally, and as you said, red hot if they're plugged. say they didn't get red hot, but just more hot, would a infared thermometer be able to pick up the difference??
Former Vendor
Joined: Jan 2006
Posts: 3,849
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From: Seattle
You can remove the o2 sensors from the exhaust pipes and see if the vehicle runs better. Taking the sensors out relieves the back pressure caused by clogged cats. PS, catsalways are hotter than the rest of the system. The catalytic process generates heat at over 1000 degrees F. Dan.
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