I have a 2007 ls with 53000 miles on it and its knocking on start up about twice a week it started about 2 weeks ago. The first day it knocked it was real sluggish and shifted really hard it stopped doing that but still knocks. I check the oil filter last night and the oil was really black with only about 2500 miles on it but the filter looked almost new. Does any one have any idea what could be causing this so maybe I can get the dealer to fix it before the warranty is up in about 6 months.

 

Anyway you can make a video of it? What you call knock may be something else. Check the oil level make sure there is enough oil in the engine.

 

It is defiantly a knock and the oil level is ok but the filter doesn't seem to be doing its job. The filter doesn't have any debris in it and the oil is coal black.

 

Had a similar issue but mine was the cam chain tensioner,you sure it's knock from the piston.
Mine was so intermitten bringing it to the dealer would of been a waste of time but I finally talked them into changing it because the part was on its third revision which showed a definite problem with them.

 

Ok Im taking it in the week before christmas so Ill keep the tensioner in mind.

 

Your oil symptoms sound lik the oil filter is stuck in bypass mode somehow. Not sure how to verifiy or correct that though.

 

The bypass is in the cap and the fitler will collapse before it open the engineers ran a test at work and thats what happened. The whole filter and houseing are poor design by GM i personally know two of the engineers from Champ Labs and they told me the filter does its job but barely.

 

Don't use anything but oem filters,any other I have tried have collapsed(the twisted look when removed)

 

We make the OEM filters so thats all that has been it it since I got it and its crushed two of them.

 

i hope you guys cut open your filter as a oil filter filters from the inside out. also gm oiling design is second to non, Volvo, Ferrari, and many other use the element type because it works better the flaw is the filter us k&n or better you can tell by the weight of the filter and the twisting isnt failing its when you unscrew the cap the oring is set so it grabs and twist the filter as all powerstrokes have done since 1998 any thing with a cap will do that. As to your problem it is probably the vvt which includes the tensioner

 

2007 2.2s dont have vvt

 

Ok you have three things wrong the filter filters from the outside in, the element type filters in our cars don't filter very well and twist is from the oil flowing through the filter.

 

yes they do not what you are thinking but they do if you cut oil feed to the tensioner and gear set it fails this isnt changing valve timing as v.w. does or ford even but it is a hydraulic form of vvt

 

you keep believing that and your life will get much harder when you want to make real power Benz and other use the same oiling system because its better the twisting is from the removal you want me to prove it put some assembly grease on the orings on the new filter it wont do it it aint oil flow and it does send pressurized oil thru the inside then gets cooled in the oil cooler

 

also put your filter in then take it right back out it will be twisted and i have a friend who got his oil changed at a oil change shop LNF they forgot the oil filter one time and boom no more engine the filter works or you wouldnt have a car right now and my oil pressure sensor is in the oil filter housing and it works fine by my oil pressure gauge. my royal purple stays purple for 2500miles on my k&n filter

 

you use royal purple. all credibility is gone.

 

dont be fooled my car went from 32mpg to 38mpg and my buddys truck 05 5.3 chevy 4x4 went from 300miles a tank to 450 so say what you will my lsx must have it and all you vvt guys should use it too that worth the extra 15 dollars guess you guys use mobile 1 too bad it have failed in engines running more than 700hp with boost it foams and fails texas speed and performance lost a 1000hp twin turbo c5 to mobile 1

 

L61 doesnt have vvt dude

 

Wow if you gained almost 19% mileage from an oil then GM must be doing something completely wrong.

Please, that's just foolishness.

 

hell dont believe me not my loss and your car doesnt change valve timing but it does have a hydraulic tensioner and lash which very with the rpm just like vvt so yes you do have vvt just not what you think it is. you guys will just learn the hard way dont listen not my loss

 

just try it then do it in a small engine dont believe me put it to the test everything i own has royal purple in everything engine trans and drives. i rebuild trans and rear ends and i can tell you it works so do your own test your mileage will go up and royal purple guaranties it

 

Ok your arguing with the wrong person here my dad is one of the engineers for these filter the twist is from pressure spike on cold startups. And the reason you lost your engine with out the filter is because that little plug on the end of the filter is what keep the oil from going striaght back to the oil pan without going to the top half of the motor.

 

So back on topic anyone else have anything else to check for the problem.

 

did you get your car used???? cause maybe previous owner didn't do oil changes and your oil passages in oil pan my be slightly clogged causing lack of lubrication on start up

 

OP, I would also do a fuel filter change and maybe even some seafoam treatment. Really wakes the car up.