Ok here's the deal. I have a Ls/vtec with GSR head and PR3 pistons. I advaced the timing and i drove the car started hearing a little tapping then after a while the car started misfiring, so i checked the #2 cylinder and noticed that the spark plug was messed up. The spark plug was missing some of the tip where it sparks and some of the porcelin. So i changed all the spark plugs and adjust timing to stock and my car still sounds like its misfiring. Do you think that the peice of spark plug could of bent my valves??

Compression testing tomorrow

 

how did the compression check go?

 

I did a compression test on my motor and got:

#4cyl #3cyl #2cyl #1cyl
150psi 270psi 270psi 270psi

Should i do a leak down test? I did a piston ring test so i know its not the rings.

 

just outta curiosity what is a piston ring test

 

did you get the piece that broke off out of the chamber??

i guess a piston ring check it to see if the rings are blown or not, more commonly known as a leakdown test.

 

i say you pull the head off and check if the valves are bent... keep us updated...

 

I tested the piston rings by pouring a little bit of the oil in the cylinders and then did a compression test. The compression did not go up in the cylinder that was the lowest leaving me the head with the problem.

I will be taking the head off next week.