I just did a compression test on my 00 civic Em1 it has a B20 Vtec here are results now my question is what do I do next because as you can tell cylinder 4 is a bit higher then the others

 

Maybe a little bore-scope camera to see if that piston has excessive carbon on it or something.

 

ok awesome and lets say there is carbon build up what does that mean as we'll as if it doesn't have carbon build up lol sorry for the questions I just recently started getting into my Honda more since mechanics are charging a arm and leg for little simple things so its new to me

 

Excess carbon points to things like excessive fueling or poor ignition (in dirty cylinders).. Think bad/dirty injector or bad plugs. Also possible valve-stem seals leaking oil into the ports in that cylinder. Maybe inspect & adjust the valve lash to ensure cam timing is good.

Carbon buildup can also be caused by driving hard when the engine is cold. ECU runs very rich when cold trying to slowly warm the Pistons. Excessive fuel from driving hard when cold cause build up, especially down in the rings. Though usually occurs in all cylinders and causes stuck rings and high oil consumption.

These concepts apply to all engines. Just thinking out loud here.

 

I see ok got it thank you and no bye all means keep thinking out loud lol really appreciate the tips bro

 

Was your engine fully warmed up when the test was done? Also, do you know what Pistons are in it? Your compression numbers are high for a B20 indicating aftermarket pistons. JDM ITR numbers.

 

The deviation is too high. You have some issues internally.

 

I actully don't know about engine neither parts I bought off some kid that had this car I mean just horrible man and I got super lucky with it because you can't find any more EM1s anywhere not even in junk yards so was super stoked and just been cleaning it up making it look nice its a classic now you can't find one anywhere like at all and no the car has been off it hasn't been wanting to start is why I was doing the compression test but just wanted to thank you man it was indeed carbon build up I got some cleaner put it in and bam man what do u know started up its idling rough and throwing a lot of smoke out of exhaust its cleaning all that junk and carb out so yeah got her going again thank you for your input on it led me straight to issue ill post a pic of her