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Pontiac Forum: Catalytic converter
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  #1  
Old June 14th, 2018, 07:02 AM
greasemonkeyjmj greasemonkeyjmj is offline
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Catalytic converter

So this morning on the interstate during my daily commute, I notice my fuel hand dropping a lot quicker than normal. When I exited the interstate and got on the side street, my SES light came on. I pulled the code and got a P0420. I have noticed a rattle from beneath the car when I am sitting still and throttle up and down. so I am thinking that the cat has died on me. Can anyone give me an idea on what replacement they have used that has worked well for them. This is my commuter car, so nothing hi performance is required. Thanks
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Old June 14th, 2018, 10:17 AM
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melsg5 melsg5 is offline
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The P0420 can be the converter or O2 sensor or other things so make sure you have all possibilities checked before throwing a new converter in. I have also come across threads where people have had issues with aftermarket cats still throwing the P0420 code. Try to go with a brand name converter, don't go for the cheapest in this case.

https://www.obd-codes.com/p0420
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Old June 14th, 2018, 10:39 AM
greasemonkeyjmj greasemonkeyjmj is offline
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Hi, some pf the reasons I am thinking converter, besides the obvious rattle in it, is that I bought the car going on 2 weeks ago, it had a blown upper intake gasket, which was making it have to bump the fuel way up to match the extra air it was sucking in., I have no idea how long the drove it like that before I bought it. When I pulled the supercharger, I let quite a bit of coolant get into the lower intake and the EGR valve tube, I tried to get as much out as possible, but it still managed to get enough in it that it steamed out the exhaust for a couple of minutes after I started the engine for the first time. I have been putt putting around with it, so I got in the throttle a few times yesterday to kinda clean the cobwebs out, I guess when I did, I finished the cat off. I did notice this morning when I started it, that the exhaust did not smell like it normally did, the car has 140k on it and it looks like toe original cat on it.
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Old June 14th, 2018, 11:24 AM
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melsg5 melsg5 is offline
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I agree that the conditions you state would have caused the cat to go. If you are going to do the work yourself seriously consider a factory part to avoid problems with aftermarket units.
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Old June 14th, 2018, 11:30 AM
greasemonkeyjmj greasemonkeyjmj is offline
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I have been seeing where people has had good luck with the Magnaflow 99306Hm on the Bonnevilles, They have not been stating any SES lights coming on while using them, so I am kind of looking at going that route, but I am waiting on additional feedback, Thanks
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