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Extremely rich and rough idle
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<blockquote data-quote="AfricanSnowOwl" data-source="post: 16477568" data-attributes="member: 168923"><p>It's not the PCM. It was just replaced, but I double checked it anyways. All good there. I did measure the O2 sensor voltage at the PCM and noticed that it doesn't really cycle. It was holding around 0.9v, and would occasionally dip down to 0.6 or 0.7v real quick, but it didn't seem to be cycling at all. It did that on both the L and R sensors. Didn't change whether the engine was cold or hot.</p><p>I am absolutely certain the HEGO ground is as good as it could possibly be. The fusable link also tested fine. I did not test continuity from the sensors to the computer yet. </p><p>What would cause the sensors to not cycle and hold .9v? Is that something that would cause a crappy rich idle? Both of the sensors are less than 3 months old...</p></blockquote><p></p>
[QUOTE="AfricanSnowOwl, post: 16477568, member: 168923"] It's not the PCM. It was just replaced, but I double checked it anyways. All good there. I did measure the O2 sensor voltage at the PCM and noticed that it doesn't really cycle. It was holding around 0.9v, and would occasionally dip down to 0.6 or 0.7v real quick, but it didn't seem to be cycling at all. It did that on both the L and R sensors. Didn't change whether the engine was cold or hot. I am absolutely certain the HEGO ground is as good as it could possibly be. The fusable link also tested fine. I did not test continuity from the sensors to the computer yet. What would cause the sensors to not cycle and hold .9v? Is that something that would cause a crappy rich idle? Both of the sensors are less than 3 months old... [/QUOTE]
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Extremely rich and rough idle
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