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

 

Yes you can adjust the timing but requires a more extensive ECU calibration and also the program to be able to access your ECU.


You could check your Monitors for their state of readiness. Also look for any DTC or pending DTCs. Just because you dont have a check engine light does not mean you don't have a pending issue? Then you should also check the opertion of your knock sensor. This does require a good scanning tool and also connected directly to your diagnostic connector. You can view live operation and determine if it is within specification. While there you can also view your timing to see if when the knock sensor os active the ECU is reducing your timing advance?
But I think what you are going to find in the end is likely a carbon build up. You can do a compression test and see if the cylinders are a bit higher then what is standard and also if they are all about the same?

 

Welcome to the forum

 

Just to clarify, there is more than one system to rate the octane, or anti knock, level in gasoline.
In Australia and much of the world the Research Octane Number (RON) is used, thus the 91 & 98 numbers mk noted.
In the U.S. and Canada a different system is used. Motor Octane Number (MON) (which comes up with lower numbers in a different test) plus RON ÷ 2 is the number used for our Anti Knock Index (AKI), so the U.S. 93 AKI is about equal to the 98 RON.

 

mk1, have the spark plugs been changed?

 

good thought! ^^