5.3 LS Top End Noise

countrypuppy4865 · 03-27-2017, 01:55 PM

If this is an 07 model new body style, it could very well be a lifter problem. If it is an 07 it should have active fuel management which disables 4 cylinders to supposedly decrease fuel consumption. These lifters are prone to failing and causing problems. Eventually, it will result in camshaft wear. If it is not a new body style 07, then it would more than likely be a lifter issue. If the noise is mainly when it's cold, it is very likely that a lifter is just getting weak and it bleeds down when sitting.

03-27-2017, 01:55 PM	#11
countrypuppy4865 Senior Member Join Date: Nov 2003 Location: Donaldsonville, LA Posts: 981 Likes: 17 Liked 228 Times in 70 Posts	Re: 5.3 LS Top End Noise If this is an 07 model new body style, it could very well be a lifter problem. If it is an 07 it should have active fuel management which disables 4 cylinders to supposedly decrease fuel consumption. These lifters are prone to failing and causing problems. Eventually, it will result in camshaft wear. If it is not a new body style 07, then it would more than likely be a lifter issue. If the noise is mainly when it's cold, it is very likely that a lifter is just getting weak and it bleeds down when sitting. __________________ Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird