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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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<blockquote data-quote="Artisanau" data-source="post: 430068" data-attributes="member: 19863"><p>Hi, I’ve just tried to reach out to MDuncan who you’ve responded to in the past. I am keen to know if he was successful in finding a cure for his 3.6 JK, so I’ll wait to see if he hooks back in to help out. </p><p>Xackley, you seem to have a handle on the scanner suggestion. Let me ask you, if my Jeep is throwing out a P0306 misfire on cyl 6 code, do you think it’s probable that it could be the O2 sensor without throwing up a relative fault code. The only o e that is visible is P0306.</p><p>Like I’ve said already, the engine purrs, no rough idle, or rough running. Since I replaced the plugs and swapped out the coil, I got like 156 days use out of it without the EML light coming on. Now it’s on between 6 and 9 days an dit seems most apparent when I sitting in traffic that it’ll come on? The only thing I can think of right now is that air flow is reduced over the engine and PCM which seems to get real hot <img class="smilie smilie--emoji" loading="lazy" alt="🥵" title="Hot face :hot_face:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f975.png" data-shortname=":hot_face:" /> in my opinion, maybe that’s how it is but like I said to Matt, most cars I’ve owned prior have their PCM fitted within the interior not the engine bay. I’m going to take the manifold off again, swop out the injector 6 with 1, recheck the wiring underside the manifold. Buy an extension for my compression tester just to have the numbers written down. I done a block test tonight after a run out, no issues like CO% in the coolant, so I’m assuming no cracks. I’m going to buy some new leaks for my fluke and bring it out of retirement, then back probe the inj wires and coil wire to the PCM as I don’t have a wiring map, like you say, as rare as hens teeth and I can’t find one. Failing that I’ll look into the scope you suggest or scanner sorry. I’ll need to do some homework to understand nominal values etc, so I know what I’m looking at to interpret them correctly. </p><p>if you think of anything I haven’t mentioned <img class="smilie smilie--emoji" loading="lazy" alt="😂" title="Face with tears of joy :joy:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f602.png" data-shortname=":joy:" /><img class="smilie smilie--emoji" loading="lazy" alt="👊" title="Oncoming fist :punch:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44a.png" data-shortname=":punch:" /> maybe you’d suggest something. All the best to you and the other Jeepers! <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /> Mark.</p></blockquote><p></p>
[QUOTE="Artisanau, post: 430068, member: 19863"] Hi, I’ve just tried to reach out to MDuncan who you’ve responded to in the past. I am keen to know if he was successful in finding a cure for his 3.6 JK, so I’ll wait to see if he hooks back in to help out. Xackley, you seem to have a handle on the scanner suggestion. Let me ask you, if my Jeep is throwing out a P0306 misfire on cyl 6 code, do you think it’s probable that it could be the O2 sensor without throwing up a relative fault code. The only o e that is visible is P0306. Like I’ve said already, the engine purrs, no rough idle, or rough running. Since I replaced the plugs and swapped out the coil, I got like 156 days use out of it without the EML light coming on. Now it’s on between 6 and 9 days an dit seems most apparent when I sitting in traffic that it’ll come on? The only thing I can think of right now is that air flow is reduced over the engine and PCM which seems to get real hot 🥵 in my opinion, maybe that’s how it is but like I said to Matt, most cars I’ve owned prior have their PCM fitted within the interior not the engine bay. I’m going to take the manifold off again, swop out the injector 6 with 1, recheck the wiring underside the manifold. Buy an extension for my compression tester just to have the numbers written down. I done a block test tonight after a run out, no issues like CO% in the coolant, so I’m assuming no cracks. I’m going to buy some new leaks for my fluke and bring it out of retirement, then back probe the inj wires and coil wire to the PCM as I don’t have a wiring map, like you say, as rare as hens teeth and I can’t find one. Failing that I’ll look into the scope you suggest or scanner sorry. I’ll need to do some homework to understand nominal values etc, so I know what I’m looking at to interpret them correctly. if you think of anything I haven’t mentioned 😂👊 maybe you’d suggest something. All the best to you and the other Jeepers! 👍 Mark. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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