i did a compression test on my car i got good compression in three cylinders an none in one of them what can cause that to happen

 

Scoring, hole in the piston even burnt valves

 

Bent valves, Burnt exhaust valves, or Worn out compression rings.

 

thanks guys i figured that would be it i just wanted to get a couple inputs an my car isnt burning any oil so i dont think its the stem seals but i could still possible have bad compression rings in that one cylinder

 

an i know there is no hole in my piston i have ran nos in my old civic so i know wut a hole in the piston will do

 

Here's one example of what can cause zero compression!

 

so everyone knows it ended up being a burnt valve on the intake side of the number 4 cylinder thanks ctcgene an so everybody knows it cost around 500 dollars to replace all valves but u will have a brand new head pretty much