Right so I've had look on it too got rid of misfire on boost (dizzy) sorted out vacc piping etc, but car is still low on compression on cyl no 4, no1 to 3 150psi no4 75 psi we've put some penetrator oil left it for couple of days and no change. Put some oil down the bore it rise comp to 125 psi warmed car up (stopped smoking etc) and comp back to 75 psi. There is no smoke or knock etc from top or bottom car takes that extra turn to start appears to drive ok when cold, ( when stood outside and it pulls away it can be heard it's missing) not so ok when warmed up. Another thing which I've noticed oil temp is going up very quickly after 1mile it's around 90 deg and there is rust in coolant.
So have you guys got any suggestions before I'll take head off?? On 1 test drive it boosted absolutely fine and pulled great???
Turbo has been checked and all ok, all boost hoses are ok, vac hoses are ok, fuel pressure is ok
Any ideas please