Reride Posted August 23, 2015 Report Share Posted August 23, 2015 Hi Guys, I'm having a problem with the 3.1 in my '92 CSC. It was running fine and all of a sudden it started running rough, sputtering, and blowing black smoke and then would die. After it sat for a while it would start and run fine for a bit and do it again. It threw a bunch of codes so I replaced the O2 sensor, plugs, wires, ICM, now it will start, idle great, then shut off. Now it throws a 23 & 43 codes. These codes are kind of vague. Can anyone here shed light on this for me. Quote Link to comment Share on other sites More sharing options...
Reride Posted August 23, 2015 Author Report Share Posted August 23, 2015 By the way it has 42 psi at the fuel rail. Quote Link to comment Share on other sites More sharing options...
Reride Posted August 30, 2015 Author Report Share Posted August 30, 2015 For those who might be interested, I took a temp gun and checked the temperature in front and back of the catalytic converter. The temp in front of the cat 142 & 117 behind, so I pulled the O2 sensor out and started it up and let it run for about 30 minutes. Though a bit loud it ran great. The temps were low because the motor was cold, but the temps in front of the cat should be lower than behind it due to the chemical reaction of the exhaust with the ceramics into the converter. I replaced the converter and life is now what it should be. Thanks everyone! GnatGoSplat and oldparts 2 Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted September 2, 2015 Report Share Posted September 2, 2015 Thanks for coming back and posting the solution! Honestly, I never would have guessed. I probably would have been chasing my tail looking at ECM and injectors. Quote Link to comment Share on other sites More sharing options...
vipmiller803 Posted September 2, 2015 Report Share Posted September 2, 2015 Plugged cats are always interesting diagnoses... Good job figuring it out yourself. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted September 4, 2015 Report Share Posted September 4, 2015 Temperature after the cat should be higher than lower. It appears you know that already, but transposed your words. As Gnat said, thanks for updating with the solution. Many people do not when posting problems. Those that do help others that later search for terms that land them here. Quote Link to comment Share on other sites More sharing options...
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