Ok guys did a compression check to nite.. and here are the numbers

1- 175

2- 175

3- 152------ very troubling to me.. added some oil nothing changed

4- 175


so what would be the next step???

 

have someone do a leakdown test. the test should give you a good indication where the leak is at.

good luck.

 

it'a not your piston rings then, might be a head gasket. You need to work your way up now. If the pressure would rise after adding oil that would mean that it sealed the gaps in the piston rings, but that is not the case you are describing.

 

ok thnxs fellas...

 

Ok fellas did a leak down test today, only a 4% loss of air in # 3, added oil no change, also listen to air in the ex mani, and intake mani, no air leaking..... I was told it probly is my lifters.. but dont know yet, anybody have any clues let me know

 

Do another compression test. You didnt say what method you used to conduct the test. I did one on my car following directions posted on here. My #3 cylinder was low, my buddies was the same way. We unplugged the camshaft position sensor. Which is the wrong way.

The way the maintenance manual says to do it unplug the crank position sensor which is located on the back side of the valve cover by the PCV valve.

 

^^^^^^ how do figure that would make any sense, the valves are mechanical, they either close or open the valves, no way a sensor would change the test......

 

From what I have seen, some of the 03-05 Evo 8s have the same issue with cylinder #3 reading a bit less than the others. There a few threads on here with individuals experiencing a similar issue.

 

hmmm, well there has to be a solution to the problem......... and u can tell that my motor has low compression, because of the idle, and how the motor sounds unbalanced...

 

bump

 

any body have some useful information, that I could use to fix my problem??/

 

bumpity bump

 

This is useful information. Your motor is fine. Its not a problem.

 

I dont know how it would affect the compression I just know it did on 2 different cars. I did the check on a friends with the cam sensor unplugged and on mine. Both cars the compression on #3 was low. I did some research and found out we did it wrong. Redid the compression check with the crank sensor unplugged IAW the maintenance manual and all 4 of my cylinders were 180 +/- 2. I just know it worked. I do a compression check on my car once a month and it has always been at 180+/- 2 except the first time when I did it wrong.

 

You would have to have a completly collapsed valve for it not to lift up enough to open the valve all the way. If it was collopsed you would hear this sounds because it would be loud as in a loud ticking. Here is some info for you.

http://en.wikipedia.org/wiki/Hydraulic_lifters