Quote:
Originally Posted by MIPS
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.
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Only an exhaust leak up to, and only a little bit past the O2 sensor can cause the sensor to *read* lean. However, I will say that even a pinhole leak can throw off the O2 sensor reading, especially close to it. Also, that any significant exhaust leak will kill the engine power, strange as that sounds, you would normally think a leak would create less backpressure to hinder the engine, but it's kinda the other way around. A big enough leak will create a blockage with its own air currents.
Also, an analog meter might be better for reading the oscillating O2 sensor output, but obviously yours is quite a bit off. But there's also that thing where DVOMs don't necessarily read oscillating DC voltage that well.
Also also, I feel like I suggested replacing the O2 sensor before, but I can't be fucked to go back and look :P
Also also also, nobody ever replaces O2 sensors on pre-OBDII cars, because there's really no way that the driver would be informed of its failure.