Iight guys, I just check my compression number again today. 200 in cyl 1, 175 on cyl 2, 140 on cyl 3, 200 on cyl 4. Add some oil into 3 and it rises to 175, add oil to number 2 and it rises to 225. I'm scared now that it could be my piston ring, but there are no symtoms or signs that could be my piston ring. The exhaust doesn't blow any smoke at all, during driving or idle. The only problem with the car is blown radiator after radiator, lagging on the motor between 2-3k rpm, cel light on for secondary o2 sensor and misfiring cyl 3. Hardly see any coolant mixing with oil. Maybe it still the blownheadgasket? Or is it definantly the piston rings? Someone please help me out.

 

how in the hell do you add oil to an individual cylinder?

 

Take out the plug spark for that cylinder and add about a teaspoon of oil into it. heh

 

i wasn't calling you stupid, just don't realize why you would do that. It's not gonna do anything but damage. Is the car smoking or what? The bad compression could be because of the valves also. The compression seems somewhat normal for an older motor, your gonna have some difference.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohc steve &raquo;</TD></TR><TR><TD CLASS="quote">i wasn't calling you stupid, just don't realize why you would do that. It's not gonna do anything but damage. Is the car smoking or what? The bad compression could be because of the valves also. The compression seems somewhat normal for an older motor, your gonna have some difference.</TD></TR></TABLE>

That is a well known method for determining if bad rings could be causing the lower compression number. Adding oil into the cylinder will help a bad ring seal better under pressure whereas adding oil into a cylinder where the ring is okay will not improve the compression test results much.

 

Ty guys, but I'm still wondering if indeed it could be my piston ring. Because the car doesn't blow any white smoke at all and plus the car doesn't burn any oil. But i'm going to take off my head and look at the headgasket and see if it a small leak or something. I'm just afraid that my piston might be the cause of all this, but there is no way knowing, since there are no signs of it.

 

sound like you prolly have a little of both.
the easy way to check. (not the most accurate though)
is to start the car with the radiator cap off wait for it to wharm up a little then look for lots of air bubbles coming from the radiator as you rev the engine to around 2000-3000rpms.
that means there is air and combustion gases in the coolent.

the right way to check is a cylinder leak down test. and look for the same thing. as the cylinder is compressed with air.

 

Ty for the reply rainforest. A couple of week I did ran the car until it get warm with the radiator cap off. Whenever I rev up the engine, coolant would shoot out. So would it be headgasket or piston ring.