Hey guys, I've been having this warm startup idle issue ever since I got my car tuned by my tuner back in June. He's been a pain to get a hold of to rectify the idle issue.

Anyways, it only happens when the car is warm and I start it up again, the idle would fluctuate up and down and the AFRs are lean at around 16-17 but goes away once I start to drive it.

The last time I met up with my tuner, he looked at it for 5 mins and made some changes to the MAT density chart but that didn't fix it. I just wanted to see if anyone on here has any ideas what it could be and how to get this fixed. It only does it on warm start ups and at idle, once I drive it's fine and the AFRs seem OK to me from my novice eyes.

Please let me know if you have any ideas or can help me solve this. I have added my current tune and a datalog of the idle. Thanks!

 

Kinda common issue, increase ASE and ASE Taper, for your hottest value.

 

Heatsoaked IAT sensor. Move it to the coldside end tank of your intercooler. Search the threads here, there are many.

 

Even if you relocate the IAT Sensor to an optimal position, hitting traffic jams will get the sensor heatsoaked on a hot day.
Hot restart issue is not only IAT related anyway, and yes there are many helpful topics on this matter.
Most cars I've tuned had this issue, you need fuel temp correction to get rid of it 100%

 

were you the one on our FB group posting?

 

Yeah, i'm the same person on the FB group.