my 3800 is knocking at low rpms when it gets warm.. what you guys think is up?

 

Probably worn out bearings or low oil pressure. Oil thins out as it gets hot, which in turn casuses the oil pressure to drop. If the bearings or the oil pump are worn out the oil pressure wont hold as the engine gets hot, causing bearing knock. This will eventually result in a spun bearing or even a thrown rod. Assuming you are now using the recommended oil weight, you can try heavier grade oil as a temporary fix.

 

i really hope its not a bearing or rod, my engine has 3k miles on it.

 

Mileage isn't the only key factor. If the engine was not properly broken in/machined then this issue can come up earlier. Pete gave good advice - a thicker oil will help silence the problem, but won't cure it.

 

I have the same problem. Just rebuilt my engine. with just about 3k on it. Low knock noise only after car gets warm and is not noticable all the time. Next oil change will be going to straight 30weight. Hopefully helps. Will let U know

 

You may want to try something like 10W40 or 20W50, rather than straight 30 weight which acts like 10W30 at high temp.

 

k thanks. its really gay. im pissed at my new engine...however it did come with a warrenty. do ya think chevy would cover it?

 

Read the fine print. Most of time there is some sort of "improper break-in" clause. Good luck. Its worth a shot.

 

i guess its the throwout bearing on my clutch. i took it to my parents mechanic and thats what he told me anywho...[&:]

 

wow lol. well you lucked out.