Engine goin out, need some fresh ideas please

[jduldula]

I've had a misfire in Cyl. 1 for a while now since I got my car back from my mechanic and did a compression test today.

Cyl. 1- 125psi
Cyl. 2- 205psi
Cyl. 3- 200psi
Cyl. 4- 195psi

And now I've been told its either my piston ring going out or my block ring on that cylinder.
So what I'm asking here is any ideas of what I should do (i.e. what kind of block I could put in with my EJ25D heads or go with the same engine block etc.), or what kind of pistons I could put in since I'll be in there anyhow to maybe mess with compression a bit. Or any other mechanical ideas that could be causing my low comp. and misfire in that cylinder.

I had the headgaskets changed about 2k mi ago and a 3 angle valve job done along with new cats and o2 sensors. I still lose coolant very very slowly but enough to make my car heat up, but not OVERheat to the top top of the gauge, just the 3/4 part (a little over the temp. symbol). I'm thinking that the misfire and coolant drops are related.

Any ideas would help. :smt023

[decke48]

preform a leak down test, to see if it the rings, valves, or hg's leaking

[green97gt]

+1 ^

yeah, a leak down is alot better test.

[ouch1011]

If you just had a "valve job" 2k ago, you really need to have a leakdown test done. Typically low compression with no smoke out the exhaust would suggest something other than a ring problem. Double-especially if its been having this problem since you got it back from the mechanic.