OBDII scanner / engine performance
 

A few years ago I was told cars can lose performance if the OBDII port is used for data retrieval. Anyone know if that is a myth or true? If it is, how about the 370?

:wtf2:

ehhh.... idk how that would even be possible. thats like saying reading texts on your cellphone will hurt its performance...

I think it was from Mazda or something, they do some weird stuff. I doubt it too, but curious if anyone can confirm

I'm thinking complete myth.

The kernel of truth may be this: After 200+ reflashes, ECU's can start to act a bit wonky, or so I've been told.

It probably dates back to the old ECU's when OBDII first took over (1995). The ECU's of the day weren't all that fast so delivering serial information on the OBDII port could potentially make the ECU process engine data a few cycles slower. Probably not by much, and probably not enough to make a significant difference. In modern ECU's not likely at all, they have extremely fast processors compared to 15 years ago, the data on the OBDII port is nothing to them (even though the data rate is now higher).

It was a long time ago, you might be right that we probably dont have that problem