Red hot catalytic converter?

Tiny
DWMAZURJR
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
The #2 bank catalytic converter is getting red hot.
Do you
have the same problem?
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No
Wednesday, September 15th, 2021 AT 1:29 PM

2 Replies

Tiny
SQM
  • EXPERT
Hello,

Typically you will have an overheated exhaust component if there is a restriction.
If the exhaust gases cannot escape properly it will build up pressure and heat inside the system.
Usually the restriction is just after the overheated component.
You can use a infrared heat gun to find the spot where there is a significant temperature change, as likely the restriction is right before that spot.

There is a good change you might have a clog/restriction right after that converter.
As you know the internals of the converters can come loose and restrict the air flow.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

You might have to take off that pipe to have a look.

Please let me know of any questions.
Thank you.
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Wednesday, September 15th, 2021 AT 2:16 PM
Tiny
JIS001
  • EXPERT
Hi, just to jump in, have you had a chance to scan the computer for codes. If you have not then here is a link on how to do it with a scan tool.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Now if you have a scan tool and you are able to read live data I would look at the intake temperature sensor data. While cruising around 40 MPH and no cars around you with a co pilot looking at the data. Hit the accelerator pedal down to the floor. If the intake air temperature sensor climbs up a few degrees then yes, investigate for a plug exhaust. If the temperature goes down a few degrees then there is no restriction. Sometimes the upper oxygen sensor can get stuck causing too much fuel or not enough fuel to pump. When an 02 sensor is stuck it should post a fault code, either a current or pending code.
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Thursday, September 16th, 2021 AT 9:09 PM

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