My current mods are PFC, ebay intercooler, downpipe, 3inch exhaust, non seq mod. I took out the jdm blackbox solenoid system. My car ran shitty until I adjusted the idle screw on the left of the throttlebody assuming you have the inlet facing you. But recently its been hot around here and everytime after I go on the freeway, the car would die right when I come to a stop. It would not start up or idle unless I give it a bit of reving. I try to solve the problem by adjusting the idle air screw to give it more air and that seems to work. I'm wondering what could be the problem? I searched and seen some people suggest problems like this would be the fuel pressure? I know I don't have the fuel pressure solenoid(because it was attached to the black box) I'm wondering is there an alternative solenoid I can use if that's the problem?

 

When was the fuel filter last replaced? Does the ECU contain any codes?

 

not sure about the fuel filter, i'm running a pfc and i thought it doesnt spit out codes.

 

likely a pfc tuning issue... are you running the base map? O2 feedback on? Did you cut the harness wires per the Apex'i instructions before installing it?

 

what is your idle set at? did you get your PFC tuned accordingly to your mods?

 

didnt get it tuned yet, will be tuned very soon . i turned o2 feedback off and i bought the car like this so i assume the wires are cut since it doesnt have an airpump and egr cause its a jdm motor. should i try driving with the o2 on?

 

I have the exact same problem and i cant find the sollution!!!
I ve been reading the forum but cant find any thread with sollution for this problem.
Has anyone solved this annoying hot idle issue?

My car is a s5 fc turbo ii convertible. The mods are full 3" turbo back, TID intake, FMIC, upgraded sard fuel pump and hks fcon piggy ECU.

Is it possible to blame the air sensor that is located inside the AFM?