1983 Plymouth Scamp GT - Lacking in Performance
There was a service bulletin on these to move the exhaust oxygen sensor wires into a separate connector. The problem was voltage tracking from battery to the oxygen sensor which then would lean out the carb.
Yep! I worked in Chrysler engineering & a tech I was working with figured it out by spraying the underhood with water. The problem was typically intermittent & the water made it show up. The oxygen sensor was zero to five volts so it didn't take much to send a rich signal to the computer which leaned out the carb. There was an eight cavity plastic connector & the ox sensor was next to battery voltage. I remember letting the wiring guys drive a car & it wouldn't go over 40 mph at full throttle. It was a simple fix to move the sensor into its own wiring connector. I even wrote the tech bulletin!