Now t has been checked with a scanner. There were 2 active fault codes. First was low battery or volts etc so the mercruiser mechanic said i shoul replase both batteries. He said these engines are really demanding on good batteries since they consume so much current due to 12 sensors active all...
Is beeps twice like every 2 minutes and if i try to drive faster like 25 knots it gives Guardian mode and says reduce throtle until i drop to around 2500-3000rpm.
engine runs fine on idle and on higher rpms. Pressures ok and temporatures ok. Changed impeller and added plenty of fresh gas after...