hi guys, been having this on going issue on my R34 RB25DE+T ever since the turbo conversion.
when cold (left overnight for example) i start it the next day and the idle is very rough and lumpy and the car full shakes/rumbles etc but give it 2-5minutes then it will just idle normally.
any idea what causes this and how i can fix it?
i took apart the AAC on the weekend and gave that a clean with TB cleaner but no luck.
however i believe the plug connecting to the AAC wasnt properly connected and it was tuned like that.
when i got the car back i thought the rough idle was caused by o2 sensor not being connected (thats what the tuner also told me) so i connected it up and it still happened.
2 months later, i serviced the car and i plugged it all back in after putting the sparkies in then it idled like sh*t (stage 3 cams like) even when warm so i disconnected the plug to the AAC played around with the idle adjuster screw a bit and manage to get it idling okay but till this day, as mentioned above, it still idles sh*t when cold.
any help much appreciated as it is quiet frustrating not knowing why its doing it.
Cheers