Sounds like hg or piston. Cost me $1056 for two new hgs, uim gasket, lim gasket, head studs, em gaskets, vc gaskets, coolant flush, water pump, thermostat, plugs, and wires. Of course, that was paying a shop to do it of course. You could do a coolant system leakdown test to try and cancel out a bad piston and/or verify its just the hg.Originally Posted by grand prix newb
Sh%t
I ran car for 5 - 10 min to get it to operating temperture,
Did compression test 3x on each cylinder and here are the results
#1: 155 -150 - 150psi
#2: 150 - 150 - 150psi
#3: 80 - 80 - 80psi (sh@t-f%ck)
#4: 160 - 160 - 160psi
#5: 170 - 170 - 170psi
#6: 180 - 175 - 175psi
Looks like hg or head right?
