Hi, I wanted to get some opinions from you guys on this code. This code popped up yesterday on my fiance's son's 97 GMC K1500 with the 5.7L. I hooked up my scanner and this is the code that was in it. This truck only has about 29,500 original miles on it. A couple of months ago, the distributor cap developed a crack and cylinders 2 & 8 were misfiring. The truck currently has a new distributor cap, rotor, plugs, wires, and a fuel filter.
Since the truck had been run quite a bit while misfiring trying to diagnose what the problem was and then ultimately driving it to a repair shop who discovered what the problem was, my opinion is that the excess fuel that was dumped into the exhaust from the misfiring has finally taken out the catalytic converter.
This code says this: P0430: Catalyst System Efficiency Below Threshold (Bank 2) The research I've done for this code suggests it could be several things that sets this code. One is a bad O2 sensor though there are no O2 sensor codes stored in the computer. Another is a leak in the exhaust system which I have looked and listened for that and don't see any signs of a leak, and lastly that the catalytic converter is bad.
While observing the live after cat O2 sensor readings on my scanner, the readings are switching back and forth pretty rapidly, just like the pre-cat O2 sensor readings which supposedly is another indication of a bad cat.
So for anyone here who has had this code come up on their vehicle, do you think a bad cat is causing this code? Are there any other tests that I can do before taking it somewhere for a cat replacement? Thanks for any ideas or info.
Wayne
Since the truck had been run quite a bit while misfiring trying to diagnose what the problem was and then ultimately driving it to a repair shop who discovered what the problem was, my opinion is that the excess fuel that was dumped into the exhaust from the misfiring has finally taken out the catalytic converter.
This code says this: P0430: Catalyst System Efficiency Below Threshold (Bank 2) The research I've done for this code suggests it could be several things that sets this code. One is a bad O2 sensor though there are no O2 sensor codes stored in the computer. Another is a leak in the exhaust system which I have looked and listened for that and don't see any signs of a leak, and lastly that the catalytic converter is bad.
While observing the live after cat O2 sensor readings on my scanner, the readings are switching back and forth pretty rapidly, just like the pre-cat O2 sensor readings which supposedly is another indication of a bad cat.
So for anyone here who has had this code come up on their vehicle, do you think a bad cat is causing this code? Are there any other tests that I can do before taking it somewhere for a cat replacement? Thanks for any ideas or info.
Wayne