Idle Issues - Need Help

[attncka]

Hey guys

I have just recently bought myself an R33, with a MFIC ... pod filter and big exhaust .. the usual mods .. when i took the car for a test drive it the car yard was asking how it idled .. aparently it had an issue .. i never had problems ... and it had a dodgy battery which needed replacing.

i got the car .. drove it home and it was fine, i changed the battery put a new one in it .. and then all my issues started it wont idle at all, go for a drive and when slowing down it wants to come to a stall .. or it will idle very low and then come to the verge of stalling.

I fiddled with the IAC and the throttle position sensor to get it right .. set it to a good idle ... rev it and it all runs fine .. take it for a drive .. and it will either run fine for a moment .. till i turn the car off .. or run like s**t. I took it to a skyline specialist here in perth .. and he set the idle for a high idle .. and told me my BOV was leaking .. i fixed that issue .. set the idle back and still wont idle properly.

have been over everything .. and have no idea what to fix it ... could i have an AFM issue .. a computer issue ( i mean as it was fine till i changed the battery and rang like s**t after the new battery went in it ) or an throttle position switch issue

if you can help me out and give me some tips or opinions it would be helpful

Cheers guys

[TAS_SINFUL]

bah attncka.!

sounds like it could be one of 2 things to me mate..

AFM (more likely im thinking)

or it could be ignition module - does it stall when the car is hot//run good when it is cold.?

[Shmee33]

mate i have the same problem, when its cold its good to idle and sart, but when it warms up it goes to 900 then drops to 50 -100 and sometimes stalls.

what do you think is wrong?

i have just replace the tps in it

[marni]

This may sound strange but our R33 (sII) was idling at 1500rpm and we couldnt figure out why, firstly we got some carby cleaner as the throttle body was gummed up with carbon, then by chance we pulled out the idle stepper motor to find a piece of our impeller blade (we blew out the stock turbo 2 weeks earlier...) was not letting the plunger motor sit on its seat, so after we cleaned that out too and put her back together she was fine....

Hope u find out wats wrong with yours!!!!