Clogged Exhaust/Catalytic Converter? - Kia Forum

 
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Old 08-04-2010, 05:47 PM Thread Starter
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Exclamation Help!Clogged Exhaust/Catalytic Converter?

How do I know if my cat or exhaust are clogged?
With the car being tuned up, all I can think of is exhaust issues. Is there a way to check? Also, would adding a new fan clutch cause sluggish performance? It happens with or w/o the AC on.

I recently replaced my exhaust manifold and upper Oxygen Sensor (use Bosch, don't try the universal Replacement brand). I also replaced the fan clutch. I'm now experiencing some sluggish performance on acceleration and some occasional, slightly high idling.

I'm wondering how to check if I have a partially clogged exhaust or lower cat (upper cat was replaced last fall as it had completely burnt out leading me to believe the lower is partially clogged)?

A little maintenance history:
  • New plugs
  • Air Filter
  • Cleaned IAC and MAF the other day
  • New plug wires
  • New fuel filter last month
  • New fan clutch
  • New PCV valve last fall
  • New upper O2 sensor
  • New upper catalytic converter
  • Regular oil and manual trany oil changes
  • had a smoke test last fall to check for vacuum leaks (none)



Last edited by SLCSportage; 08-09-2010 at 09:30 PM. Reason: Edited content
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Old 02-09-2013, 05:10 PM
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i have the same Q, can anyone help.
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Old 02-09-2013, 05:43 PM
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Remove the B1S1, install a nipple and connect a low pressure gauge, (vacuum gauge will do), No more than 2.5psi @2500rpm...Philip
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Old 02-09-2013, 05:48 PM
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what about psi at the sensor under the pre cat?
wouldn't that be where i want to check for a clogged cat?
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Old 02-09-2013, 06:37 PM
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Quote:
Originally Posted by zkdawg View Post
what about psi at the sensor under the pre cat?
wouldn't that be where i want to check for a clogged cat?
The B1S1 is the O2 sensor directly after/on the exhaust manifold, upstream of ALL CATs... Philip
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Old 02-09-2013, 08:27 PM
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i know, thats why i said wouldnt u test the one AFTER the CAT to see how much is making it through?
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Old 02-09-2013, 10:45 PM
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Quote:
Originally Posted by zkdawg View Post
i know, thats why i said wouldnt u test the one AFTER the CAT to see how much is making it through?
My test is SOP, if you know better, why ask?..... Philip
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Old 03-21-2019, 11:00 AM
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the exhaust system post cat should not have any restrictions .. its a 2 inch pipe! useless test.
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Old 05-20-2019, 12:07 AM
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The cat on my 2001 sportage is about the size of peanut butter jar. There's an upstream, a downstream, and then a muffler nothing else. It's the Federal one that cost the most. Downstream would signify "after"
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Old 05-20-2019, 12:20 AM
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I know what he meant. Test the pressure on both. If the downstream has less pressure than the upstream it has a clog.
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