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Jeep Wrangler YJ
YJ General Discussion
Sputtering / hesitating / stalling after lifter replacement (out of ideas and desperate for help)
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<blockquote data-quote="JeepDawg25" data-source="post: 436338" data-attributes="member: 20649"><p>Resolved! I appreciate all the suggestions but the culprit was one of the new lifters getting eaten up by the cam and (probably) causing a valve issue. Last night I finally bit the bullet and dug back into the valvetrain and removed all the new components (should have been my first troubleshooting step, honestly) and the third lifter from the front - intake I believe - was clearly worn way beyond what should be expected after ~4 miles of driving and ~30 minutes of post-break-in engine time.</p><p></p><p>Spent a sleepless night trying to decide whether or not to go ahead with a full camshaft replacement, but visual inspection of the cam lobe didn't show much wear. I crossed my fingers and hoped that the old cam delivered the damage to the lifter and didn't get much back in return - after dropping in all the old components (including the original ticking lifter that caused me to do all this in the first place), everything appears to be running smoothly after another break-in and about 20 miles of driving. I doubled the break in and did 25 minutes of 2500-3000 RPM, changed oil and filter, then did another 20 minutes...maybe overkill but if I underestimated the importance of break-in before I didn't want to make the same mistake twice.</p><p></p><p>I know I am not out of the woods yet, and there could be cam damage that just hasn't revealed itself, but after reinstallation I didn't get a single instance of misfire/stumble/sputter going through all the gears and up to ~55mph. I was cautious not to let it idle for more than a few seconds, trying to keep the tach at 1800+ and treating it almost like an extended break in period. I will change the oil and filter after another 100 miles or so and check for fragments. And the real kicker - my old lifters aren't even ticking anymore. So as of now, the end result is a VERY smooth idle and acceleration after troubleshooting the throttle body/IAC/AIT sensors, no more lifter ticking, and a much wiser Jeep owner (who can do a full lifter replacement in less than two hours from start to finish!). If I get any further indication of a cam lobe/lifter problem, I will go ahead with a full camshaft/lifter replacement kit and will update here in case anyone in a similar situation has followed along.</p><p></p><p>Thanks all for the troubleshooting advice, I am sure it will come in handy next time something breaks!</p></blockquote><p></p>
[QUOTE="JeepDawg25, post: 436338, member: 20649"] Resolved! I appreciate all the suggestions but the culprit was one of the new lifters getting eaten up by the cam and (probably) causing a valve issue. Last night I finally bit the bullet and dug back into the valvetrain and removed all the new components (should have been my first troubleshooting step, honestly) and the third lifter from the front - intake I believe - was clearly worn way beyond what should be expected after ~4 miles of driving and ~30 minutes of post-break-in engine time. Spent a sleepless night trying to decide whether or not to go ahead with a full camshaft replacement, but visual inspection of the cam lobe didn't show much wear. I crossed my fingers and hoped that the old cam delivered the damage to the lifter and didn't get much back in return - after dropping in all the old components (including the original ticking lifter that caused me to do all this in the first place), everything appears to be running smoothly after another break-in and about 20 miles of driving. I doubled the break in and did 25 minutes of 2500-3000 RPM, changed oil and filter, then did another 20 minutes...maybe overkill but if I underestimated the importance of break-in before I didn't want to make the same mistake twice. I know I am not out of the woods yet, and there could be cam damage that just hasn't revealed itself, but after reinstallation I didn't get a single instance of misfire/stumble/sputter going through all the gears and up to ~55mph. I was cautious not to let it idle for more than a few seconds, trying to keep the tach at 1800+ and treating it almost like an extended break in period. I will change the oil and filter after another 100 miles or so and check for fragments. And the real kicker - my old lifters aren't even ticking anymore. So as of now, the end result is a VERY smooth idle and acceleration after troubleshooting the throttle body/IAC/AIT sensors, no more lifter ticking, and a much wiser Jeep owner (who can do a full lifter replacement in less than two hours from start to finish!). If I get any further indication of a cam lobe/lifter problem, I will go ahead with a full camshaft/lifter replacement kit and will update here in case anyone in a similar situation has followed along. Thanks all for the troubleshooting advice, I am sure it will come in handy next time something breaks! [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Sputtering / hesitating / stalling after lifter replacement (out of ideas and desperate for help)
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