Compression test result, what does it mean?

[87gninpa]

Ive been trying to find out whats wrong with my car, so i decided to do a compression test. i only did the front two cylinders on each side because it started getting dark and rainy the results are as follows:

165psi 160psi
170psi 160psi
(front of car)

can i conclude anything from this, i see they are pretty close, but i can i tell anything good or bad from this>?

 

[boostmaster]

compression

Mannn!!! thats very high avg on a good tight motor is usually around 150 psi. You must have done something previously to bump the compression ratio up.

 

[87gninpa]

wow really? it is a newer motor. i just cant seem to figure out what causing the problems ive been havingg recently, the car is almost undriveable. at least its good to know my internals are ok

 

[Tommyg]

compression

Doing only 2 cylinders doesn't tell you anything. A 10% varience among all 6 cylinders is acceptible--you must check the rest!! Tommy

 

[87gninpa]

i ckecked the front 4, i didnt have time to do the back two , ill do them tomorrow

 

[channer]

Yeah... you have to do all 6 cylinders. I did a compression test on a car I was going to buy a few years back... CHEAP.. original 55k TTYPE that was running rough!!

The first 5 cylinders were 155-160psi... I was excited, told the owner he might have a deal. Checked the last cylinder (back passenger side & a b*tch to get at)... and it read "0". Put some oil into the cylinder & it bumped it up to around 30psi... not a stuck valve!!!

check the cam sensor & see if it was put in correctly... a friend had his out 180 degrees. It ran but had no omph!!!

Good luck.... dave

 

[6SENSE]

Alot of carbon build-up can bump compression up also.