if it was piston related wouldnt the other cylinders be down on pressure aswell? i only say that because the other cylinders seem quite high in pressure
1. 160 2. 110 3. 165 4. 170 its not using excessive oil and runs fine but when its up to temp and running take the oil cap off it puffs air out. i dont know if this is normal or not? help me please thanks in advance