My Service Engine light is on because I installed a high flow catalytic converter? What can I do about it?

Question

I had a high flow catalytic converter installed on my 2003 chevy S-10 and now my check engine light is on. Before installing the cat, I reprogrammed the computer with Hypertech Power Programming. About ten miles after having the cat installed the light came on. I checked with the installer and he said that the O2 sensor looked in need of replacing and AutoZone concured. I replaced the sensor and the light still came on. I then went back to the installer to have him patch a small leak in one of the welds and he said i should try removing the power Programming. I did so, the stupid light came on again!

Any ideas??? Anyone???

Will i just have to go back to running a stock cat?????

Answer 1

You should be able to get an O2 simulator. The high flow cat is making the rear O2 sensor freak out, so you will either need to have the rear O2 code deleted from your PCM or you will need an O2 simulator for the rear O2 sensor. They typically run $30-$50. Your only other option is to replace the new high flow cat with an OEM cat.

Answer 2

did you clear the code? If not the light will keep returning.
Also, the O2 sensor could be getting false readings (from stock) caused by the programmer and cat system. If you like the performance blow the light off.

Answer 3

Any Chevrolet dealer can clear and re-set the codes to permanently fix the problem. The new converter is not to blame for the problem.

As for the throttle bodies bolt up the 454 body if it fits and you find one at a super reasonable cost. I would think however you'd be better off with one off a 350.

Again, you'll need to start monkeying around clearing and re-programing the computer.

Answer 4

at the beginning....take the motor vehicle to a Mitsubishi broker that has a restoration shop. Aotuzone would perhaps be ideal yet get a 2nd opinion from a broker who centers what they sell. thus Mitsubishi. Catalytic convertors are very high priced to change. Emphasis on high priced. the place I stay in Canada you are able to rigidity without them. In different words it is not any longer mandated by employing government through pollutants rules. you assert you regarded below the motor vehicle and observed no obvious leaks. The test you had executed refers to engine oil leakage internally out of your engine and burning out your exhaust gadget. that could harm the convertor. you will no longer see an leak visually. it is being transported down your exhaust gadget and being burned off till now it hits your exhaust tip.

Answer 5

you have 3 to 4--- 02 sensors on this truck, also if there was welding done while installing the exhaust, the battery cable should have been disconnected, as this will harm the computer

Answer 6

It really sounds like a back pressure problem. The open exhaust is not allowing a certain amount of back pressure on the system. That's my first thought.