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I know that some of you are going to do headers with high flow cats on your SRT8s very soon. Unfortunately, high flow cats have a tendency to set PO420 and/or PO430 Cat Ineffeciency codes on our OBD-II controlled vehicles. These codes do not mean, in most cases, that the cat is not working and you cannot pass emissions(such as a tail pipe sniff), but it will cause to to fail such a test even if the tailpipe sniff is clean since CELs are not allowed to be set during the check.
History: I have had these two codes set on a variety of GM vehicles I have played with over the last several years. Always after I installed headers with high flow cats. On a GM it is a simple issue. There are O2 simulators and there are tuning programs that can shut down the PO420/PO430 scan routines completely. On our DCX vehicles, not such device or tuning is available. Our Dodge Hemi Ram has set PO430 since my installation of Dynatech SuperMaxx headers with High flow cats and I don't like that CEL looking at me while driving
It seems that our friends in the Import world have found a clever little way to eliminate these two codes without computer tricks, cutting wires or eliminating the O2s. It takes a $4.00 or less part from your local auto parts store, a 1/2" drill bit and drill, jack and jack stands, tie-wraps, and a wrench. It will take less than 30 minutes start to finish.
Disclaimer: I am currently assuming that the O2s on the SRT8s share the same 18mm thread as the Dodge trucks. From a quick view under my MSRT8, they appear to be similar O2s and size.
You need to purchase 'spark plug non-foulers' from your local auto parts help section. Most places carry them. I got the longer of 2 items that matched the 18mm thread requirment to try and use only one fitting per O2. You will notice that your O2 does not fit into this fitting, but you have to drill out the fitting to a 1/2" diameter. Once completed, clean the fitting of metal shavings and burs, then insert your O2 sensor and tighten. You will notice the O2 sensor now barely clears the walls of the fitting. Install the fitting/O2 sensor into the O2 bung, tighten, route the O2 wires and tie wrap where necessary. In the case of the LX platform, you will have to reset the computer unless you have access to something that can clear the DTCs(Superchips can do this on the Hemi trucks, which I did on our truck when testing this).
The code has not returned in our truck on the regular basis it did, so this had 'changed' something in the system. I don't drive the truck a lot, but I wanted to get the info to you guys now. I will certainly repost if the code returns, but the import guys this comes from have thousands of miles on their vehicles with no repeat of the codes.
Now, who has some header results to share with us? I know some Kooks headers are out there for install. Anyone install them and willing to post results?
Pictures to help you decipher my poor english :wave:
History: I have had these two codes set on a variety of GM vehicles I have played with over the last several years. Always after I installed headers with high flow cats. On a GM it is a simple issue. There are O2 simulators and there are tuning programs that can shut down the PO420/PO430 scan routines completely. On our DCX vehicles, not such device or tuning is available. Our Dodge Hemi Ram has set PO430 since my installation of Dynatech SuperMaxx headers with High flow cats and I don't like that CEL looking at me while driving
It seems that our friends in the Import world have found a clever little way to eliminate these two codes without computer tricks, cutting wires or eliminating the O2s. It takes a $4.00 or less part from your local auto parts store, a 1/2" drill bit and drill, jack and jack stands, tie-wraps, and a wrench. It will take less than 30 minutes start to finish.
Disclaimer: I am currently assuming that the O2s on the SRT8s share the same 18mm thread as the Dodge trucks. From a quick view under my MSRT8, they appear to be similar O2s and size.
You need to purchase 'spark plug non-foulers' from your local auto parts help section. Most places carry them. I got the longer of 2 items that matched the 18mm thread requirment to try and use only one fitting per O2. You will notice that your O2 does not fit into this fitting, but you have to drill out the fitting to a 1/2" diameter. Once completed, clean the fitting of metal shavings and burs, then insert your O2 sensor and tighten. You will notice the O2 sensor now barely clears the walls of the fitting. Install the fitting/O2 sensor into the O2 bung, tighten, route the O2 wires and tie wrap where necessary. In the case of the LX platform, you will have to reset the computer unless you have access to something that can clear the DTCs(Superchips can do this on the Hemi trucks, which I did on our truck when testing this).
The code has not returned in our truck on the regular basis it did, so this had 'changed' something in the system. I don't drive the truck a lot, but I wanted to get the info to you guys now. I will certainly repost if the code returns, but the import guys this comes from have thousands of miles on their vehicles with no repeat of the codes.
Now, who has some header results to share with us? I know some Kooks headers are out there for install. Anyone install them and willing to post results?
Pictures to help you decipher my poor english
:wave:
