Hey, I recently had a check engine light come on when starting my vehicle(2020 Blazer 3.6L v6)
I did a scan and it gave po442 small leak in evap system. It also makes a whistling noise while driving at 2200rpms and up. Won’t make the noise in park, or neutral just in drive with a load ok engine. My trouble is my local dealer keeps telling me there’s no code on their scanner, can’t recreate the noise and have nothing to diagnose on and fix. Because of that I have paid the standard diagnostic fee because warranty won’t cover that since “nothing is wrong”
Any advice on where to start looking for problems to fix? I should say I’m fairly handy and do most maintenance that warranty won’t cover.
thanks