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R33 Gtr Idle Too High

tom9999

By tom9999,
in General Maintenance

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tom9999 Community Regular

tom9999

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Hi guys,

First off my car is idling at 1100rpm and i cant seem to lower it.

I've check the idle controller, the screw is all the way in I've adjusted the 6 the butterfly plates. Cant do it with the computer. and there's no air leaks.

What else can i do???

Cheers Tom

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tom9999 Community Regular

tom9999

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yeah i just adjusted them. Nah didn't clean them read another thread saying don't clean the plates cause it heaps seal???

Air regulator????

Air regulator...are you sure about the throttles? Did you pull them out and clean them, or just adjust?
blind_elk Grand Master

blind_elk

Posted
Posted
I've check the idle controller, the screw is all the way
That could be your problem. You need to disconnect the electrical plug before adjusting the screw to get the idle correct.

(You may need to "unadjust" the butterflies too)

MrStabby Grand Master

MrStabby

Posted
Posted
Yeah that's for a RB25. what do you do for a RB26???.

might have another play with it. see how i go.

Pretty much the same thing (but i havent done it myself yet so not 100% sure). The AAC is just under the plenum, held on by 4 small bolts and not too hard to get to IIRC. Here's a plenum off pic showing where it mounts - its the vertical face just to the left of the braided hoses - sorry dont have a pic of the AAC itself.

gallery_15274_3064_206110.jpg

doo doo Proficient

doo doo

Posted
Posted
Yeah that's for a RB25. what do you do for a RB26???.

might have another play with it. see how i go.

Yeah it's the same. With the engine running take off the brown plug off the back of the aac valve then screw the adjuster in to lower the idle, then plug it back in, it should then be reset. The other thing is that the idle solenoid does cark it with age.

tom9999 Community Regular

tom9999

Posted
  • Author
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hi guys,

i pulled off the idle solenoid and cleaned it and reset it and still didnt lower the idle. if i take the brown plug off the solenoid i can control the idle then????

Yeah it's the same. With the engine running take off the brown plug off the back of the aac valve then screw the adjuster in to lower the idle, then plug it back in, it should then be reset. The other thing is that the idle solenoid does cark it with age.
blind_elk Grand Master

blind_elk

Posted
Posted

You need to have the idle control unplugged from the ECU, otherwise the ECU just keeps making corrections to the AAC valve position. That defeats the whole purpose of the exercise.

Have you also "unadjusted" the butterflies?

blind_elk Grand Master

blind_elk

Posted
Posted
how do you unplugged it from the ECU???

yeh i adjusted them to get the idle down, but it only went higher. so i put it back,

Bad choice of words - should have said 'disconnected'.

Simply disconnect the electrical plug from the AAC valve, that will "unplug" it from the ECU.

Put it all back to "factory" first, then do the necessary adjustments.

flatspeed Newbie

flatspeed

Posted
Posted

Hey tom !

Theres two things you may need to do,they are both quite difficult unless your competent with spanners and common sense.(no disrespect !)

first,if your idle screw is all the way in,it sounds like the spring in the valve may need a bit more tension.Directly underneath the idle valve screw you will see a circular blob of glue,behind that is another screw that tensions the idle valve,you`ll have to chip all that away,then you`ll find either a plastic or brass screw that will screw in to tension the idle valve,plastics ones are a pain so maybe you might want to go for option 2...which is...

Where your 3 throttle linkages meet the throttle cable(bolted on the plenum)remove the three(8mm headed nuts)take the adjustable linkage off the throttle control and pull on them slowly and try to feel any resistance,you should feel a slight resistance as the butterfly breaks from the closed position,repeat the process for the other two(each one controls 2 cylinders).Now if you look where they connect at the bottom of the throttle bodies you`ll see a screw(throttle stop) withanother 8mm headed lock nut,the screw has a philips screwdriver slot so you can unscrew the stop and then use the locknut to secure it.If you can experiment with the first screw(which is the easiest to get to)try unscrewing it and feel the resistance improve.

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