Ticking, Clicking Noise Coming From Your Engine? Diagnosing Collapsed Lifters!

For More Info visit us at: In this video, Andy diagnoses a top end clicking or ticking noise in our Chevy Avalanche! Andy locates the clicking noise to the top driver side of the V8 engine, and also discovers an intermittent misfire in cylinder 1. After removing the valve cover, he discovers a very loose rocker, which is the source of our noise. He determines the rocker is loose because its lifter has collapsed, meaning it’s not pushing up on the rocker when activated by the camshaft. The fault is in the AFM (active fuel management) lifter, which can be disabled by engine management to make the engine more fuel efficient. The lifter failed, so it was not able to be activated again by oil pressure. Andy replaced the lifter, and after that, the noise was gone! For more great in depth diagnostics, check out this playlist! For More Info visit us at ⚠ DISCLAIMER: While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.