Hello, I’m new to the forum. I have a 2008 Suburban with a misfire on cylinder 1 per the code, so I pulled the valve cover after testing spark plugs, wires, etc. The very first lifter is not moving like the rest but the rocker arm is not loose either. I tried turning the engine over and the arm is still not lose. I assume the lifter is stuck, but I’m confused on why the rocker arm is not loose like all of the videos I’ve watched. Should move forward with the stuck lifter trick or do something else first. I don’t have the money to pay a shop to fix it, so hoping I can figure it out. Any ideas?
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Could be that your lifter has spun
The lifter could also be spun, using the starter relay with the key off, spin the engine over. Make sure not to jump the wrong terminals as it could damage the ECM. Vlom Must be on for this test. While it is spinning watch the suspected rocker move. Make sure that it rocks at least 6 to 7 times before you let up on the starter. If the rocker stops moving before then it is getting fed oil pressure and is likely spun. You can determine this by looking at the side of the lifter. To see the side of the lifter you need to pull the VLOM and clean out the oil tower of the suspected lifter with cleaner and shop air. Once cleaned you can look down the oil tower and if you see a hole in the lifter it is not spun. If however you see only shiny metal or a flat surface then the lifter has spun due to a bad plastic lifter guide. When this happens you will need to replace the camshaft and all lifters. This would be a good time to do a full AFM/DOD delete where you remove all AFM components and replace them with non AFM components.