Quote:
Originally Posted by ike84
Sorry but I really can't comment on the specifics about the durametric readouts. My knowledge of afrs is limited to use of wide band o2 sensors and afr or lambda readouts, and narrow band sensors like ours can be very finicky. With that being said though my experience in working on cars has been two things 1 - it's really easy to overthink these types of problems 2 - you can spend forever looking up detailed specs, reference values, etc when that time may have been spent turning wrenches. I'm not knocking your approach at all, but rather criticizing all the time I have spent doing that exact thing when all I really needed to do was start physically working through things on the vehicle. The theory behind ICEs is really quite simple, and all things revolve around a few basic principles that will lead you to a diagnosis in nearly all circumstances. (I'm sure you've heard it before but don't lose the forest through the trees lol) I'm totally with you that the "eh let's replace this part and see what happens" approach is fool hearted at best but i trust the processes of reason and elimination more than anything when it comes to complex problem solving. Not to mention that Amazon's return policies are great, so try a new part and if it doesn't fix the problem clean it up and send it back and then let someone else buy it at a great discount lol.
Anyway, I'm happy to help if I can. Good luck and keep us posted!
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Hey, thanks for the quick response. I've got to admit, I am beginning to be tempted toward just replacing a few things (especially the low-dollar stuff) and see what happens.
I think if I can't get specifics on where the O2 output signals should be or what the STFT PID is in Durametric, this limits my ability to continue troubleshooting with any reliable effectiveness. But I cannot find any confirmation that maintaining a full-sweep sine wave of 0.04mV to 0.85 mV is even a failure mode for narrow-band O2 sensors, meaning logically, they're working and it's something else. That said, after I test the cats with a back-pressure gauge, replace the spark plug tubes, test crankcase vacuum with my manometer again and smoke the intake once more, my next step may be replacing the O2 sensors. Fortunately, I enjoy working on the car and learning more about it, so I'm just going to keep at it.
Thanks for the time and the help!