Hi again Scotty ! I have a mazda 3 2012 Skyactiv 2.0L. it has 165k miles. I did a compression test on the engine and got 170 psi on each cylinder. On the mazda service website, it seems like I should…

lonelyworks

Hi again Scotty ! I have a mazda 3 2012 Skyactiv 2.0L. it has 165k miles. I did a compression test on the engine and got 170 psi on each cylinder. On the mazda service website, it seems like I should have 95.9 to 120 psi. They say that if the psi is higher, I may have issue with the variable valve timing. I don't have check engine, car seems to run fine, except that the car seems to take more gas than it should. I may have found some oil near alternator, here's the picture. I check the oil pretty religiously since it has some miles on it and it doesn't seems to loose that much. Another thing I noticed which is probably normal or not, when the car is running, it seems to have excessive crankcase ventilation. When I open the oil cap, oil is coming out and a lot of air is pushing by it. Let me know what you think about this and thanks for all that answer ! You're amazing !

Comments (6)
No. 1-3
lonelyworks
lonelyworks

I found it the problem was, the last mechanic putted the timing chain 2 pin away from stock. Those motor retard the intake timing. There was a bit of leak of gas, injector seal was bad on left. Thanks for the tip

Scotty Kilmer
Scotty Kilmer

Editor

If it runs fine, live with it. Realize actual pressure on your gauge is probably not accurate. They call them relative compression tests for a reason

lonelyworks
lonelyworks

It may be gas too, because its right at the side of the fuel lines. I'm not sure.