I have previously made a thread titled "oil on belt," but decided to make a new thread so that all thoughts were cleanly organized in the first post.

The problem is that the motor is leaking oil onto the belt, I don't know where it is coming from.

1. I ran a cold compression test and got 180,210,210,180
   
2. there is a small amount of oil in cylinders 1 and 4, and there was some on the number 1 sparkplug.
   
3. the number 4 spark plug was slightly damaged, it had part of the tip taken off
   
4. I don't see any oil leaking on the driver side, just the passenger, from an unknown location onto the belt.
   
5. The car seems to start and drive fine, except for oil reappearing on the belt after an hour or more of driving.
   
6. there are no check engine lights, I would sometimes have misfires in high boost.
   
7. I have gm stage 2 with a 2.9 pulley, dual pass, and heat exchanger.
   
8. there is a small amount of smoke out the back.

thanks for all of the help

 

bump

 

Those compression numbers and oil being in cyl 1 and 4 tell me your engine is on its last leg. Misfires confirm it

 

Even though the motor runs and idles fine? and the misfires are only under high boost?

Wouldn't the compression test be lower if it were a problem with the rings?

 

He is saying you already have oil present in your cylinders, oil will seal the rings better and you are still getting 180. All your cylinders are supposed to be within 5% of eachother. (I think its 5%) Yours are more than 10% of eachother.

 

alright, well thanks. what does this mean for me, new rings?

any chance of a warranty? the car has 60,000 on it.

 

Yes since there is oil present in those two cylinders it is giving you a false high number, you most likely just need rings. Change the spark plugs to stock and gap them at .035 and see if the miss goes away, is it constant or random? If it is random under what conditions have you noticed it does it the most.

 

Looks like you need rings to me.

 

the best way to determin the true condition of the cylnders is through a leak down test
as for cylnder pressure 180 isent out of gm specs

 

True, leakdown will give you more insight as to what is the actual problem. 180 is not out of gm specs but not every tester is going to perform the same its best to go off percentage of variance between the cylinders. This particular engine is hurt .

 

it could be hurt but i have seen oil be drawn in to the cylnders from a leaky center gasket on the valve cover if i remember right gm specs is 40% (it could be higher)between cylnders

 

Never heard of that, pull the cover and check the center gasket. I don't recall a center gasket whenever I pulled the cover on my old lsj, learn something new every day

 

there is 4 of them around each sparkplug openening

im not saying that is the absoulte cause just something ive seen before

 

All I have to say is 5 year 100,000 mile powertrain warranty...take it to Chevy dealership

 

Ahh I know what you are talking about now belvedere

 

do I still have the warranty even though I am not the original owner?

 

x 1,000,000

i'm so tired of seeing "your motor is blown" comments because of oil on top of the plug..

 

I was going off of compression numbers, and the oil inside the cylinders, pretty common signs of rings on their last leg. Just speaking from experience here. Next time ill tell him its normal

 

I'll check the gasket tomorrow, and if that looks ok it's going to the dealer

 

Okay, very strange but cylinder 1 is now dry, I am not sure what is going on.

I am thinking about replacing the valve cover and plug gaskets, but I don't see how that causes oil to get on top of the cylinder heads. can someone please enlighten me?

 

the problem was indeed the valve cover gaskets. I soaked them in some sealent for a while so hopefully they last until the new ones get here.

 

That is great news, I'm enlightened with the cause I won't lie

you caught a break my man mr.belvedere ftw

 

I was skeptical as well, but Mr.belvedere knows his stuff apparently. I almost **** my pants when there was no longer smoke from the exhaust.

 

I took notice of his insight a while back when john powell said he knew his stuff. Most people just don't know who he is lol

 

its because im an ******* and im not always right although i wish i was