sr20det_28

Hi, iv'ed been messing aroung with reverant ms3x a bit, tunning is going well, Idle VE is setup. PID seems to be decently tuned, And EGO Correction is set at 15% starting at 20kpa.

Cold or mid start, everything is fine, runs fine even after a good run. Stop it and after a short amount of time(5-15min), idles goes crazy lean, Then after a few minutes, everything is back to normal. Then i still get lite lean peaks at red lights and stops(15-15.5A/F).

Anyway suggestion on where or what to look at?

Log attached. Lean idle to normal.
IAC seems to be alot higher, so i guest i get to much air in, wich is weird because engine speed is kind of stable!

triple88a

iTrader: (2)

Where is your temp sensor located? This seems like the normal case of heat soaked air temp sensor.

event

iTrader: (1)

My car has similar issues. In hot weather it idles lean and a little rough. It's located between the alternator and radiator in aluminum pipe. What's the best place for it?

triple88a

iTrader: (2)

Right after the intercooler. Your problem is different. Your problem is the air temp correction. Its set to lean out too much with temp increase. You gotta change the values. His problem is when he shuts off the car the sensor temp increases because he no longer has air flowing through the piping and it heats up so when he starts the car back up the sensor is too hot and doesnt give enough fuel.

sr20det_28

At the exact same place as event, you suggest changing MAT sensor location would fix this? or just live with it?

triple88a

iTrader: (2)

It would definitely help and at the very least make it so the sensor cools down faster while u start moving so u'll be back to normal and idling at good temp faster.

sr20det_28

I'm going to try that! as soon as i find myself a welder -_-, Thanks man!!!!