R33 Idle

[RamR33]

hi,i have a nissan skyline r33 1993 model and it idles at 2000rpm wen i first start it in the morning and then after about 15min it would drop down to about 1400/1500 rpm it does have a different bigger penum and throttle body on it as thats how i bought the car.

When it warms up and i go around for a drive it slightly drops to 1300/1400 rpm and then i go home and adjuust the idle screw it does nothing till i rev it and the it drops to 900/1000 rpm.

I would then go for a drive again and it would jump up again after 5min and if it stays at that idle under 1000rpm it would stall or feel like a cut out till it hits over 1200rpm again.

I have taken it to a mechanic but the best they could do is have it idle at 1300rpm and they thought out all my vacume leaks and fuel and tuned and it still does it.

Any help on this would be great.

[defari]

trying to read that hurt my head and i dont know what to say and so ill just say this and hopefully it works and here's what you should do coildpacks and plugs and vac leaks and iac valve and afm and i dont know what else

[RamR33]

Its hurting my head not knowing whats wrong with it.

ive fixed all the vac leaks changed the pugs and the coilpacks are fine, so that leaves me with afm and iac valve.

Any ideas how i go about cleaning the afm its a z32? and where the iac valve is on this setup or are they located all the same?

[Girorostar]

check this thread out, it may help you out on the aac valve and iac valve cleaning.

http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/page__hl__iac+valve

[RamR33]

thank you for that, gonna try it tommorow hope it works

[blind_elk]

Which "idle screw" did you adjust? DO NOT adjust the throttle stop screw (on the side of the TB). You adjust the screw in the IAC (with the electrical plug disconnected).

Have you checked base timing?

What ECU is it running?

The AFM shouldn't need specific cleaning - on shutdown, the ECU heats the AFM hot-wire to burn any crap off.

[RamR33]

yeah didnt adjust the throttle one i just adjusted the one on the aac thats it but didnt really need to adjust as when it warmed up it went and stayed on 900rpm...you mean i should adjust it with the plug on the aac off?

Do i do it when its warm or cold? cause when i cleaned the aac it was sitting at 2000rpm then it dropped down.

How do i go about when its cold not to be at 2000rpm and to be a lil bit lower then that?

[RamR33]

MY ACC was very dirty bad so cleaned it and all good,would that have affected my perfomance on the car cause i havent yet gone for a drive but just let it idle ?