i have had my engine compresion tested today because my engine management light is on with the diagnostic machine saying missfire on cylinder 2 iv changed the pluggs swapped the injecor and changed the coil pack. someone advised me to get my engine compresion tested so i tested cylinder 4 it came up saying 145 psi and cylinder 2 where the problem is supposed to be was 135 dose this sound ok thanks


mick
just to let you no my car is a o2 wrx sti type uk it has been remapped with ecutek

 

what on is cylinder 2???

is it the front left one?

if so mine was doing the same and turned out to be a relay

 

yes it is the front left. what relay was it on yours do you no

 

Easy DIY compression test with pics! - NASIOC

may be of help