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Jeep Wrangler YJ
YJ General Discussion
O2 sensor replacement questions
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<blockquote data-quote="jeepjoe43" data-source="post: 431004" data-attributes="member: 19255"><p>That is the clutch slave cylinder bleeder valve. You're good.</p><p></p><p>As to the O2 sensor, I'm guessing it's throttle body FI as the sensor is in the manifold.</p><p>Mine is a '91 with MPI and I put my sensor where yours is (mines supposed to be in the head pipe about 4" from there).</p><p>The only reason I did this was the new exhaust had the bung but they didn't drill the pipe and I knew the manifold had a plug.</p><p>What difference could 4" make, well I've got similar issues to yours now and it's developed a random miss.</p><p>Maybe related, maybe not, dunno.</p><p>But, if I don't warm it up first, I'll get CE light and code 52 every time, O2 rich.</p><p></p><p>As for yours, I'm thinking the sensor is fouled.</p><p>Coolant from a leaking head gasket will do it, Oil will too.</p><p>As will a sticky injector or leaded fuel.</p><p>The fouling on the sensor will look different for each.</p><p>[URL unfurl="true"]https://www.walkerproducts.com/o2-sensor-training-guide/troubleshooting-oxygen-sensors/[/URL]</p></blockquote><p></p>
[QUOTE="jeepjoe43, post: 431004, member: 19255"] That is the clutch slave cylinder bleeder valve. You're good. As to the O2 sensor, I'm guessing it's throttle body FI as the sensor is in the manifold. Mine is a '91 with MPI and I put my sensor where yours is (mines supposed to be in the head pipe about 4" from there). The only reason I did this was the new exhaust had the bung but they didn't drill the pipe and I knew the manifold had a plug. What difference could 4" make, well I've got similar issues to yours now and it's developed a random miss. Maybe related, maybe not, dunno. But, if I don't warm it up first, I'll get CE light and code 52 every time, O2 rich. As for yours, I'm thinking the sensor is fouled. Coolant from a leaking head gasket will do it, Oil will too. As will a sticky injector or leaded fuel. The fouling on the sensor will look different for each. [URL unfurl="true"]https://www.walkerproducts.com/o2-sensor-training-guide/troubleshooting-oxygen-sensors/[/URL] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
O2 sensor replacement questions
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