Really bad compression

[steveyblack]

well like the title says, I have bad compression...well REALLY BAD compression in 1, the rest are low...

cylinder
1-51PSI(!!!!!!!!!)
2-125
3-127
4-126
5-130
6-130

well my big problem is cylinder one...So I put the engine on TDC and then blew compressed air through the hose into the #1 cylinder, and i hear air coming out of the intake(and feel)...So my guess is that my valve is stuck..is there any way to see this without ripping the head off? I will be anyway but I just want to do some other things too...

I had no problems with it while it ran, i only idled the car before, not beat hard on it, so could I of missed this problems since I only let it idle?

 

[sneakypete]

i would take the check clearances. but ultimately i would take the head off for further inspection.
some more info would help. is this a new car? how long have you had it? any other symptoms?
-pete

 

[steveyblack]

No where near new, but I guess ill just rip off the head...But what else could cause me to have such little compression in that cylindeR???

 

[sneakypete]

i cant say for sure. in my experience, i had 0 compression in cylinder number 3 along with a crap load of blowby. my research led me to believe i had a stuck valve. i took off the head to check it out and the valve was fine (the head was remanufacted 3 years earlier). turns out i had a melted a piston from detonation. one of my injectors was crapping out.
im not sure if your in the same boat as me. but i didnt know what was wrong until i took off the head.
unless someone else chimes in to tell you otherwise.... check the valve clearance, etc according to the tsrm. if that all checks out, i would take the head off to take a look.
-pete

 

[steveyblack]

well if i had a hole, I would have held nothing...Maybe a cracked valve seat(where the valve rests onthe head)? a small one, one that would let PSI out, but still hold some..???

 

[sneakypete]

thats what im thinking

 

[grimreaper]

Get a scope and have a look down there, rotate the motor and get the #1 piston at the bottom of the stroke so you can see the walls too.

 

[suprarx7nut]

Did you test it wet? You should have and that would lend a thought as to whether you have bad rings on any one cylinder.

If numbers don't hardly change when wet, you most likely have problems in the upper side of things.

 

[steveyblack]

Yah i forgot to say that i did prime it, and even after the first set of results, i put some in through the spark plug holes...barely did anything

 

[steveyblack]

Ill find out tomorrow what it is...ill let everyone know..pictures too