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09-07-2017, 03:00 PM | #1 |
Registered User
Join Date: Jan 2012
Location: Tyler Texas
Posts: 223
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Catalytic Converter Issues on 98 5.7L 2wd Suburban
The cat on bank 1 is rattling bad - the honeycomb is for sure broke apart but I am not getting a code P0420.
I am getting a code P0430 for bank 2. That cat is not rattling. I am confused. If the cat on bank 1 is rattling, wouldn't I get a code or am I not getting the code because the honeycomb is busted and it can breath? Is there anything else that could be causing P0430 on bank 2 besides the Cat? Both cats were replaced about 2 yrs ago. I could never beat the codes from coming back so I put in the defoulers. Someone said the defoulers can cause issues with running rich though. I am just not sure what to do and I am tired of throwing money at it. |
09-13-2017, 05:39 PM | #2 |
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Join Date: Sep 2017
Location: warner springs
Posts: 13
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Re: Catalytic Converter Issues on 98 5.7L 2wd Suburban
If BOTH cats were replaced 2 years ago, and , you know in your mind the honey comb in one is bad, unless you clunked it on a rock and did not tell us, I am going to assume you have a fuel issue. Running rich can definitely destroy a cat. I'm going to suggest you track down the rich run issue before throwing money at the cats again.
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09-14-2017, 11:24 AM | #3 |
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Join Date: Jan 2012
Location: Tyler Texas
Posts: 223
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Re: Catalytic Converter Issues on 98 5.7L 2wd Suburban
were do I start? I am getting 60PSI at the port. Turn key off and I have constant pressure for 30 min or more. So I know the regulator is good. The Fuel pump is 2 yrs old. The fuel filter I changed in March of this year. Do you have some suggestions on how I can check the spider? I am reading conflicting reports on google.
Could this be an internal engine issue? I'm not a mechanic by any stretch, but I have replaced just about every electrical sensor on this truck since 2012 when I bought it. Thanks for your help. I greatly appreciate it. |
09-14-2017, 06:44 PM | #4 | |
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Join Date: Sep 2017
Location: warner springs
Posts: 13
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Re: Catalytic Converter Issues on 98 5.7L 2wd Suburban
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09-14-2017, 11:30 PM | #5 |
Registered User
Join Date: Jan 2012
Location: Tyler Texas
Posts: 223
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Re: Catalytic Converter Issues on 98 5.7L 2wd Suburban
The one on bank one has now been replaced today. This was the one with the broken honeycomb. No more PO420. Bank 2 cat is good according to shop. Problem is I still have PO430.
I hate tearing apart plenum to get to spider if that not my problem. I guess the shop could be wrong but he said its good. I am not sure how in the world I could tell the engine is dumping raw fuel or antifreeze into the Cat. A little water or something is coming from the exhaust put I was told it's just condensation. It does not smoke at all. If I have a vacuum leak somewhere I got zero smoke popping out anywhere when I shot my fog machine through the brake booster hose and there is no hissing sound. I am down for whatever test is necessary. I just need someone to tell me what to do next and how. I will say my brand new ICM is "standard" brand not AC Delco. I also may have used teflon tape on the threads to my new ECT sensor. I learned today that is a no no, so tomorrow I will tape the tape off and reinstall. Surely the tape is not cause the truck the run rich and threw raw fuel into the cat. Not sure how I will prove it without replacing the Cat and the code not coming back. I can post live data if needed. I have no other codes at all. Thanks a million for your help so far. Last edited by shultzee13; 09-14-2017 at 11:34 PM. Reason: Forgot one thing |
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