Recently installed a 70mm throttle body, along with ARC intake+camber, Mugen header. On an F20C 05model. Idle problem came in after throttle body instalation, because I had the other parts installed before the throttle body and had no idle problems.
Idle problem goes like this, at cold start up, after it warms up a little, 1st gear in drive off then go in nutral and revs go down down under 1000 then just keep going down and stalls, from any gear to nutral. Does this for about 5min, as time goes on it goes away and idle problem goes away and totaly back to normal. Only when car cools down and start up thats the problem arises and only for about 5min anyway.
The throttle body is ASports, you send off the original throttle body off, and they actualy machine it to 70mm and ofcourse along with the nessasary parts. Problem cant be throttle body because my mate has same model car, all same engine parts same engine and year and he has no problems.

Im thinking the cars running a little too lean at 1000rpm. Any thoughts?

 

Have you checked the TPS Voltage?

 

TPS Voltage? I dont know what that means. Explain...

 

Ok I know what TPS is now. How do you check it? Do you need to hook it up to a computer or something to find out the voltage? Or is there a way I can just flick a switch to "normal working order" LOL

 

heh, it sounds like you are gonna have to take it to a shop or dealership to get your problem fixed. Unfortunately, all we can do in UTH is tell you suggestions of what to do. unfortunately, we're not a mechanic's school.

 

TPS checked, lowered voltage 0.22V shut. Idle problem is better but still stalls but not as easy.