500 miles on Seafoam will probably kill the engine. Seafoam is designed to break down oil crud and in the process, oil. 500 miles later you will be needing new bearings lol. Maybe go 25-35 miles then change it pronto.

 

lol yeah I did a search of my problem on google and found where others where having a similar problem and someone suggested to run seafoam for about 500 miles then change the oil and they said it fixed there problem. Lol I was that WHAT 500 Miles! I had figured that was way to much just wanted to ask to make sure I wasn't the one who was wrong. I have always been leery of putting any kind of a cleaner in my oil. Was always worried it would brake everything lose and clog something up.

 

Seafoam won't clog anything up, it dissolves clogs. Just don't run it over 50 miles or you will dissolve your bottom end.

It will also clean the crud out of your valve covers and promptly deposit it in the oil filter, hence the need for immediate change.

 

Ok tried the seafoam thing and no help. After I changed the oil ran it for a bit then changed it again to make sure everything was clean. I also got my autometer oil pressure gauge installed and hooked up. At idle it runs about 25psi and when reving a bit it goes up to aboue 50psi. Doesn't that seem a bit low at idle? Every other ls engine I have had ran more than that at idle. What do you guys think?

 

It sounds like mine, the grindings from the cam lobe ate up a couple of bearings and my oil pressure dropped. The big difference in our stories is the large amount of different types of metal that came out when I drained the oil.

 

You have an oil pressure problem. Either bad pickup o-ring is aerating the oil, or you have a chewed up lifter or cam bearing. Cyclic clattering is a symptom of oil pressure going so low the lifters collapse. You should see 38-40psi at idle and be able to push 75 at full throttle.

 

I guess I will just replace the engine then. Been driving it and it hasn't got any worse so Im just gonna pray it holds up until I get another engine and get it prepped up. I can get around 03 model 5.3 with over 100k miles for like 400 bux, or like a 06 with about 50k for 800. Even the older 6.0 engines with over 100k are over a grand around here. So what you guys think the 06 with about 50k the best deal?

 

Check this website I buy alot of stuff from here Car-Part.com--Used Auto Parts Market . The wrecking yards in my area are just to damn expensive it is cheaper for me to buy things from another area and have it shipped. Check it out....

 

Thanks Man!

 

Just a bit of an update, I have been driving this truck to work everyday without any issues other than the knocking sound and it doesn't seem to have gotten any worse. I have even driven it on the interstate some. I pray it keeps holding up until I am able to replace the engine sometime next year. Like beginning of Feb. We will see.