Rich? Air Fuel Mixture...

Hey! Inside of my pipe is black. I thought nothing of it. My uncle says it's running rich. My AFM (according to OBD) is average at about 15. Does this seem normal? I have no idea.

 

Completely normal. Every gasoline/diesel engine does this.

Source: I'm a motorcycle technician.

 

14.7:1 air fuel ratio is considered optimal or "stoichiometric". Your truck (as all OBDII vehicles do), monitors for abnormal air fuel ratios and will set a check engine light if there is a problem.

 

Technically he is correct. It's rich.

But that's what it's supposed to be. ECU cars are have been set rich the last 20 years, especially cold. It's the OE way to keep bad things like detonation from occuring.

The good news is that the ECU controlled EFI can give better drivability, power across the RPM band and MPG than any carb adjustment ever could. Which is what I'm guessing your uncle cut his teeth on.

Curious. Is he in his late 50's or mid 60's?

 

15:1 is just a hair leaner than 14.7:1.

 

I didn't get the notifications! I'll have to tune that. Thank you all for your help!!

 

Wut?

There's no 'tuning' to be done on these vehicles. The ECUs are locked down.........

 

I think he meant his TW settings so he gets notifications.