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11-25-2018, 08:49 PM | #1 |
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Join Date: Jan 2012
Location: Tyler Texas
Posts: 223
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Tearing up cat converters
98 5.7L 2wd suburban. O2 sensors brand new. Fuel test: pressure holds long after key turns off. Sub runs fine no misfire codes. I’ve replaced the cats twice and now this will be the third time. Muffler shop says there is no exhaust leaks. I’m at a loss. Plugs are not wet.
Is there a test to determine what is going on? Thanks guys Posted via Mobile Device |
11-25-2018, 09:31 PM | #2 |
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Join Date: Sep 2018
Location: Montoursville, PA
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Re: Tearing up cat converters
Mileage on them?
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11-25-2018, 09:39 PM | #3 |
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Location: Tyler Texas
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11-26-2018, 09:13 AM | #4 |
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Re: Tearing up cat converters
What is the reason for replacing them? Are they clogged? Or are you getting codes(P0420/P0430)
If they are clogged, you have another issue that is causing that. 150K is the average lifespan of an OEM converter. Aftermarket converters are typically shorter. |
11-26-2018, 08:10 PM | #5 |
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Join Date: Sep 2018
Location: Montoursville, PA
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Re: Tearing up cat converters
Some of the cheaper ones only have a 25000 mile life span. Most all aftermarket ones will not live anywhere near what the OEM ones do.
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11-26-2018, 08:32 PM | #6 |
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Join Date: Jan 2012
Location: Tyler Texas
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Re: Tearing up cat converters
Yes persistent code PO430/PO420. My mechanic just told me I don't have any misfires and not leaking any coolant. He's saying if head gasket busted then I would have misfire codes.
He's telling me ONLY OEM cats will work long term on my suburban. I have heard this before. What say you guys? I don't want to make a bad decision. Just looking for input. I appreciate your time. |
11-26-2018, 09:40 PM | #7 |
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Join Date: Oct 2009
Location: .
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Re: Tearing up cat converters
I’ve had good luck with the walker direct fit converters for these trucks. They are salty.
https://www.amazon.com/Walker-50410-...59891590&psc=1 |
11-27-2018, 07:30 PM | #8 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,687
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Re: Tearing up cat converters
Sounds fishy to me. Even aftermarket cats should last 100k or more, they are all made from the same stuff. How much stuff is in them and resulting amount of actual conversion that is going on inside them is the big difference.
My oem cats are almost to 200,000 miles.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
11-29-2018, 09:41 AM | #9 |
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Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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You could be chasing your tail
Cat efficiency codes could be from many things. Not just the cats.
If you're replacing cats that many times just for a code, you should get rid of the monitoring function (along with the CEL and code) for the cat efficiency and be done with the problem. I had used O2 sims for years to do just that but they would intermittently give a code. I eventually had PCM Forless program out the function. Not knowing how your inspection is done there, this may not work. Here in SEVA, they do not do a tail pipe sniffer test. The cat shells are there but they been gutted. |
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