yea i seem to be having some idle af problem. my afr stays at 15.2/15.3 when at idle. i tried to richen it up a little to bring it down but no luck. could it be my injector latencies?? help help

 

I would think that it is latencies or the scaling since when you are idling at normal operating temps you are in closed loop. Have you pulled a log of the STFT and all three LTFT trims while idling for at least 16 min?

Josh

 

no i havent done that yet. do you think i need to adjust the scaling or latencies???

 

My car has always idled closer to 15.0AFR with the A/C and all accessories off but I never really worried about it since it does no harm (only good...fuel economy).

 

yeah i understand that but i was just wondering what is causing this?? whats the fix??

 

You may or may not notice a very slight increase in fuel economy. The first time you put your foot in it though whatever economy you had just went out the window!

To the OP, Jack_of_Trades is right though, it doesn't do any harm. I am pretty crazy **** about stuff on my car so if it is supposed to be at 14.7 I do all kinds of stuff to try to get it to 14.7! the .3 difference could be something as minor as an exhaust leak or placement of the wideband sensor or something that small. I wouldn't worry about it. Just enjoy your car!

Josh

 

i understand what youre saying but the car is running crappy at idle. almost like its missing. plugs go quick but have just been replaced recently.

 

my evo with smallish cams idles very well at 16/17 afr.

I doubt your car is suffering from lean idle.

does your car run well wot? just think there is something else wrong.

 

then you need to log idle for 16 minutes with the fuel trims and o2 sensor readings. Who is doing your tuning?

Josh

 

its not running to its full potential. it feels like its stock power almost. i dont know what the hell is going on. i need to post up some maps or something so you guys can look to see if you find something outta the ordinary.

 

i am doing the tuning. just gotta get the hang of ecuflash.