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Art,
Sorry for dropping the conversation. My eyes and brain glazed over with TMI.
Re your Q to me - More accurately, I didn't reset the OBD codes, I erased the held faults by holding down the button for 5+ seconds two times. It seemed the blinking was not as Bentley described it should be to erase, so I did it again. Later I pulled out the 25 amp fuse on the fender wall, then reinstalled it.
Plus you are correct about the Cat not fixing the 113 nor the high NOx. The inspector insisted that my existing Cat was bad, so I bought and installed a new one & new gasket. Now, both exhaust header pipe and Cat are new with new gaskets. O2 sensor threads in to the front end of Cat. Retested, CO was down to 0, but NOx was slightly higher than prev test.
So now I will more diligently test for vacuum leaks, incl hoses, intake manifold gasket, throttle sw & body for clean & proper action. I'll look at Duane's list again- I had already checked and cleaned the accordian hose from the AMM. Duane, your explanation of the lean mix causing running hot was good for me to understand the creation (source) of the NOx. (Now I understand better why my Stihl chainsaw manuals caution not to adjust the carbs too lean under load.) A different mechanic had told me high NOx was caused by antifreeze leaking into combustion thru a bad head gasket.
I'm worried about busting nuts or studs if I find a leak and have to change the intake manifold gasket.
I'll have more to report by midweek. Any more advice will be appreciated by me and maybe some others reading this thread.
Steve
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