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  #1  
Old 08-18-2020, 09:18 PM
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Zyl 5-8 cat replaced. More power, is it possible?

My Catalytic converter on Cylinder 5-8 was throwing a code intermittently. All O2 sensors are fine. I was able to find a lightly used (67k mile) cat and had it installed today. When I drove it home from the shop, the car just felt quicker, and the transmission didn't downshift to make power where it previously had to before. Is it possible the old cat was clogged and I didn't even know it?
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Old 08-19-2020, 11:17 AM
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Probably. I've witnessed cat failures on a Saturn L300 and Jeep Liberty that did everything from limit top speed to 30mph to keeping the transmission from shifting out of first gear. If the grid starts to collapse, the back pressure buildup will cause lots of problems.


2002 X5 3.0 380,600 miles
2014 428i 69,600 miles


2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles


1970 Firebird Under restoration
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Old 08-19-2020, 11:44 AM
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Glad to hear you got your issue sorted Al. Did you end up trying the non-foulers? Just curious if that trick even works on our cars.
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Old 08-19-2020, 01:18 PM
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Originally Posted by srmmmm View Post
Probably. I've witnessed cat failures on a Saturn L300 and Jeep Liberty that did everything from limit top speed to 30mph to keeping the transmission from shifting out of first gear. If the grid starts to collapse, the back pressure buildup will cause lots of problems.
I believe that. I didn't notice on first inspection, but the grid had halved itself down the center, and there was soot in the pipe.
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Old 08-19-2020, 01:19 PM
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Glad to hear you got your issue sorted Al. Did you end up trying the non-foulers? Just curious if that trick even works on our cars.
Thanks! I didn't even bother and I'm glad I didn't as the cat was definitely bad and causing a power loss and I didn't even know it. Feels like a new car.
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Old 08-19-2020, 01:42 PM
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Clogged cats are happening more and more to our aging cars. A lot of E46 M54 engines now are suffering the same catalytic converter demise over on E46Fanatics.
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Old 08-19-2020, 04:46 PM
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i have 4.4 x5 03 can i put aftermarket cats on there or unviserial cats or do I have to get bmw spefic because of sensors etc?
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Old 08-19-2020, 10:27 PM
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Originally Posted by Overboost View Post
Clogged cats are happening more and more to our aging cars. A lot of E46 M54 engines now are suffering the same catalytic converter demise over on E46Fanatics.

From what I've noticed, the people running a lot of fuel additives seem to replace O2 sensors and cats more frequently. The two times I tried one I've always wondered if I was actually shortening the life of those components through an aggressive solvent or an operating temperature above normal operating range as deposits are "burned off". I think just sticking with Shell gasoline contributed to mine lasting 375,000 miles before triggering the CEL.


2004 X5 3.0 380,600 miles
2014 428i 69,600 miles


2004 325i Sold at 123,600 miles
2001 325i Sold at 66,000 miles


1970 Firebird Under Restoration
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Old 08-19-2020, 10:29 PM
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Originally Posted by tmat1977 View Post
i have 4.4 x5 03 can i put aftermarket cats on there or unviserial cats or do I have to get bmw spefic because of sensors etc?

I would think as long as the materials are of reasonable quality and the unit is rated for your engine displacement, it should work.


2002 X5 3.0 380,600 miles
2014 428i 69,600 miles


2004 325i Sold at 123,600 miles
2001 325i Sold at 66,000 miles


1970 Firebird Under restoration

Last edited by srmmmm; 08-20-2020 at 09:23 AM.
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Old 08-19-2020, 11:18 PM
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Quote:
Originally Posted by srmmmm View Post
From what I've noticed, the people running a lot of fuel additives seem to replace O2 sensors and cats more frequently. The two times I tried one I've always wondered if I was actually shortening the life of those components through an aggressive solvent or an operating temperature above normal operating range as deposits are "burned off". I think just sticking with Shell gasoline contributed to mine lasting 375,000 miles before triggering the CEL.


2004 X5 3.0 380,600 miles
2014 428i 69,600 miles


2004 325i Sold at 123,600 miles
2001 325i Sold at 66,000 miles


1970 Firebird Under Restoration
Same with the discussion over Shell Rotella T6 oils. The consensus is the additives in that oil seem to have an adverse affect on catalytic converters in gasoline engines.
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