rwurst918
Well-Known LVC Member
I am having this problem that I know now is not the tensioners because this knocking is not constant. When I start my LS V8 I am having a knocking noise for approximately two seconds then it stops. This does not happen every time I start my LS. It only happens after the car has been sitting for about four hours. Even after a cold startup I have turned off the LS then restarted it to find that there is no knocking on that restart. It seems like it is having an oil drain problem somewhere. I have researched this on here and I found that I have to use better than fram oil filters. I just put a Wix on it that does have the anti-drainback valve (15 bucks). It did help a little bit by making the noise not nearly as loud, but it is still there for the two seconds, once again only on startup. Upon an immediate restart, it does not have the knocking. I have been using 5w30 full synthetic Mobil One. I read somewhere on here that if I am going to use full synthetic I would have to switch to 0w30. Is this true? I also have read on here that my idler pulley is possibly bad. How can I check to see if it is? I do know everything is tight on the serpentine system. When I bought the car I did notice that it has a small oil leak on the oil pan that had a jb weld rigged fix on it. I do not know what damage had been done to the oil pan, but it seems as if its shape is normal. That fix is now failing and causing a very slow oil leak from the oil pan. Is there some crazy way possible this could be the problem or maybe something in the oil pan that needs changed?