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  #1  
Old 09-11-2013, 01:30 PM
64stacey 64stacey is offline
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Default Instant converter failure?

Ok been having issues with truck, anyway installed new converter didnt even make it 7 miles truck started to bogg down. Made it home, ended up taking off brand new cat and it was in pieces and the outside was bluish from super heating I guess. What could cause this to fail right away like this ?
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Old 09-11-2013, 07:29 PM
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Gantman Gantman is offline
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A catalytic converter can fail because of bad exhaust valves in the engine or fouled plugs causing unburned fuel to overheat the converter. ­Sometimes you can tell that a converter is clogged because you don't go any faster when you push the gas pedal. Also, there usually is a noticeable drop in fuel mileage associated with a clogged catalytic converter. A partially clogged converter often acts like an engine governor, limiting the actual RPMs to a fast idle. A totally clogged converter, which is what you probably had, even if brand new, causes the engine to quit after a few minutes because of all the increased exhaust back pressure. I hope some of this food for your thoughts helps a little bit in figuring out what caused your brand new catalytic converter to blue and fail.
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Old 09-11-2013, 10:30 PM
64stacey 64stacey is offline
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Thank you for your input. Trying to narrow down why the fuel is being dumped into the exhaust is where I am at now. I did not realize a brand new cat could clog up like that without even really driving the vehicle.
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Old 09-11-2013, 10:49 PM
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That definitely sounds like an exhaust valve not sealing/closing properly, whether bent or heavy carbon deposits on the valve itself, thus preventing a good combustion process. But on the other hand, if your plugs are fouled, that can also prevent a strong spark from occuring and not allowing for a complete charge burn. Hence, the dumping of unburned fuel out into your exhaust and filling up your cats. Well, great luck with your baby and let us know what ya find for a fix.
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Old 09-12-2013, 02:56 AM
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Bad O2 and/or MAP sensor. Had a MAP fail on a Jeep once and the thing just wouldn't start til I replaced it. Had a MAP fail on an Aries and it dumped fuel so heavily it literally blew flames out the tailpipe. THAT kind of failure will quickly fry a cat converter. Running rich by O2 sensor failure can also cause it.
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Old 09-12-2013, 03:15 AM
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cats are made to work with certain vehicles
some mechanics sometimes put a cheap 6 cylinder Ford on a high performance vehicle

magnaflow has a Universal Cat that is suppose to work on all vehicles, But does it ??

you can't usually cheap out on CATS & sometimes it sucks when you do
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Old 09-12-2013, 08:56 AM
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I've seen clogged/poor fuel systems (filter clogged, bad pump) burn up cats.

Too much air, not enough fuel make things run real hot.

Just another something to think about.
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Old 09-12-2013, 09:02 PM
64stacey 64stacey is offline
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Hey thanks yall for all the input. Im going to try to get started this weekend troubleshooting.Really hoping it isnt burnt valves. That would be a little out of my league to repair I think.
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Old 09-13-2013, 04:45 AM
jabba974 jabba974 is offline
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You would have to have one serious issue with an over-rich or oil to plug a converter within 7 miles...with the converter coming apart like that leads me to believe that the cat was damged internally before or during installation...Most of the "guts" of a converter are made up of ceramic material( among other's), which can be easily damaged...I would take the converter back and get a replacement...Did you pull any codes before you did the repair? You may also want to check if the O2 sensors are functioning properly...
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Old 09-13-2013, 11:45 AM
64stacey 64stacey is offline
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I am also wondering if the cat was damaged before I installed it. And I tested the 02 sensors with a torch and they appeared bad. That is the other thing that has me worried is the truck hasn't put out any codes I am hoping the ecm hasn't gone bad.
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