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Dodge Repair/dodge catalystic gets hot turn red

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Question
hi
have a dodge truck after taken the truck  to transmission place and replace the transmission after driving for like hour the catalystic converter got so hot it turn red like  catch on fire why?

thank you

Answer
Hi Edgardo,
There are two causes to consider:
First would be if the engine were 'missing' such that unburned fuel reaches the catalytic converter "honeycomb" it can burn up there and overheat the converter. So see if you have any engine fault codes by using the ignition key. Turn it "on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. If this is a later than '96 model watch the odometer window to see it the mileage is replaced by any 4-digit numbers preceded by P. Let me know.
If this is pre-97 and nothing show up in the odometer window, then do it again and notice whether the check engine light, which remains "on", begins to flash, pause, flash, etc.  Count the number of flashes before each pause. Then repeat to be sure of an accurate set of flash counts and then tell me what they were. You can also get a fault code readout using a plug-in code reader, sometimes for free, at a nationwide auto parts store, e.g. Autozone.
Second would be that the honeycomp inside the converter has been jarred loose and is no longer allowing the exhaust gas to flow freely through it and may be rattling, or the exhaust system may be pinched somewhere along its pipe which would do the same thing, so inspect the length of the system for that.
Please read the PS (below) and respond to it.
Thanks,
Roland

Dodge Repair

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question or asleep overnight so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top expert" from 2010-2015 here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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