Channel: 1A Auto: Repair Tips & Secrets Only Mechanics Know

Category: Autos & Vehicles

Tags: chevyhow tosierraclicking noisehow to diagnose engine clicking noiseengine noisegm v8 lifter noisedo it yourselfsuburbandiycollapsed liftertahoesilveradocollapsed afm lifterchevy 5.3cadillachow to diagnose engine head noiseticking noiseyukongmc 5.31a autocar repairavalanchegmcescaladehow to diagnose top end noise

Description: For More Info visit us at: 1aau.to/h/cKE 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 5.3L 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! youtube.com/playlist?list=PL17C5A3ED23485B90 For More Info visit us at 1aau.to/h/cKE ⚠ 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.