cx9 2013 pinging ignition
 

Hi All,
I have a 2013 Cx9 3.7 that is predetonating (pinging) at low revs, and is particularly worse when using 91 fuel compared to 98 but happens with both, has anyone else experienced this with the V6...does anyone know if its possible to adjust the timing or is it all computerised in modern cars? anyone recommend a Mazda specialist in the South eastern suburbs of Melbourne?? it has 130k on the clock
Cheers