Hey guys I was wondering if I should be concerned about my AFR at idle, its a simple setup B18c5, 1000cc injectors, tuner 2 cams, mild bolt ons and tuned on HONDATA S300 V3 boosted with a Super Charger on 13 psi.

its always been at 14.5 at OP temp during idle, but now after a short trip my idle is at 15.5- 16.3. everything else seems the same as when it was tuned during part throttle and WOT no drivability issues.

Is this a bit too lean?

Could it be my Innovate MTXL Wideband needs to be re calibrated or is going bad? I calibrated it a few months back.

 

Probably heat soaking the IAT sensor. Really common issue with the sensor in the intake manifold. You get lean hot starts.

One of the best mods imo is moving the sensor to the charge pipe/intake. The sensor is still very slow and itll still heat soak there, but not nearly as bad as being in the intake manifold.

You can also adjust MAT correction to make it not as bad, but then you may end up running a bit rich when the IATs are legitimately that high.

 

Check for any exhaust leaks before your WB sensor.

 

Thanks for the reply yes I already re located the IAT sensor on my charge pipe a while back. One thing that happened recently was I made a hard WOT pull and after that one of the wires from the IAT plug tore off and I got a IAT code on the hondata, so I pulled over and noticed the wire separated from the plug, I diddnt leave the pig tail long enough.

So I shrink wrapped the wire back on but noticed a very high IAT temps on a cold night that day so I knew something was wrong with the sensor maybe it got heat soaked or damaged from having the wire pulled of during driving, I then swapped the sensor for a used one I had in my old parts box and now I'm seeing a lower IAT temp than before and I see at least 2-4% IACT corrections displayed on my hondata so not sure if that means the sensor is reading off.. ..

Also would like to note my ECT never would go higher than 175 F before the IAT wire tore and now with the used IAT sensor I have on now my ECT will rise to 180 to 187 F which I know is the optimal temp and is fine so I'm not sure if these 2 irregular sensor readings are related. I diddnt think it was much of a problem until a few months later now that I'm having this leaner AFR during idle.

I will deff replace the sensor with a new OEM unit soon but when I tested the IAT sensor it read within the parameters on my multimeter so i just dont know if i tested the sensor wrong.

 

Will do!

 

If the motor is staying on lean is mean lol.

You wont do any damage lean at idle.