I have a eg hatch with a b18b motor bone stock with a turbo kit on 8 pounds. tial waste gate hks bov, 2.5 inch icp, log manifold and presion 60-1 turbo and 440 injectors. the car starts and idles prefectly at 750 rpms but when im driving the car and i put it in nutural the car will stall out. for example if im coming to a red light and im in 4th gear i will put the car in nutural and the rpms will drop and the car will stall out. this all started 1 day when i drove my car to work and i unpluged the ecu and than when i came out of work i plugged it back in and i started to drive home and when ever i would go to stop the car it would stall. i am using a p72 ecu that is chipped with chrome and the car was also tuned on chrome. i think my tune must have erased itself??? i have checked for vacuum leaks and cleaned my iacv but no luck.

 

Unplug your iac, check the idle level, adjust manual idle re connect iac

 

also, you may need to increase the iacv duty cycle (if possible with crome)

 

i tried to rest my idle and when i go to unplug the iacv the car stalls out everytime. could this mean a bad iacv? but if the iacv was bad than the car would have a bouncing idle corret? and just to make sure i did replace the iacv with a spare one i had.

 

no this indicates that the base idle is too low. the car idle around 400rpm with the iacv unplugged. you may need to adjust the screw on the tb to set the base idle

no. a bad iacv doesnt always result in a boucing idle.

 

^^this

 

Check ypur ECU wires and make sure you didn't rip any wires. Kinda funny it was fine till you messed with the ECU

 

Idle set screw on the throttlebody is set way to low. Adjust it some so the car idles when unplug the IACV and then adjust it to the correct rpm then plug iacv back in

 

ok i will try to adjust the base idle tomorrow and i will update. the only funny part is it all started after i unpluged the ecu.