AMC Eagle

[MIPS]

Today the last part of the feedback system was replaced. The O2 sensor.


This has almost certainly not been changed in a long, long time. It was completely dead and basically welded into the exhaust manifold. It had to be cut in half before a socket could be put over it and a lot of swearing, pulling and work with an impact driver could get it out. While installing the new sensor the harness side connector also broke off. I didn't have a replacement on hand so for now I crimped on a spade connector and glued the two halves together with RTV. In the future I'll come back and redo it properly once I find the proper replacement one-wire harness plug. The new sensor was reinstalled with a stainless steel plate stamped with the odometer reading and date of installation. In future I need to track down the emissions service light timer form a Jeep and install that.



With the O2 sensor now working the engine warmed up and settled down to a SOLID idle. No more surging and sputtering and I was able to finally set the 500RPM curb as before I could not go below 600 before it would stall at stops.



New problem though: during the carb rebuild we reset a number of adjustments to spec and this in turn nullified the factory set idle jet screw positioning, so the engine runs too lean. The above multimeter should read between .6 and .4v with an oscillation and constant stepper motor action. This will be another upcoming adjustment but otherwise all prerequisites required BEFORE you EVER touch the jet adjustments have been completed so it is now safe to perform this final tweak and not have any variables.

Edited: Wait no, there's one last variable. An exhaust leak can cause a lean condition. Right now the entire length from the manifold to the back is a bit of a disaster or clamps, welds and whistling. It might be advisable to fix that first before proceeding.