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hey guys i just replaced my injectors in my rb20, they were the same size as the previous ones,

whilst doing this i cleaned the AAC

once all back together i started it up and it idles at 2000rpm, i followed the d.i.y http://www.skylinesaustralia.com/forums/Di...nd-t110431.html here and attempted to change the idle, going by the tutorial when i have removed the electrical connector on the AAC unit my car idles at 900rpm, so i assumed that the computer needs to be adjusted as indicated by the tutorial, when i turn the little screw on the comp it does nothing

any suggestions as to whats wrong?

one possibility that i thought is that although the injectors are the same capacity as previous they are in much better condition and may flow better, could this be the cause of the high idle?

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hey guys i just replaced my injectors in my rb20, they were the same size as the previous ones,

whilst doing this i cleaned the AAC

once all back together i started it up and it idles at 2000rpm, i followed the d.i.y http://www.skylinesaustralia.com/forums/Di...nd-t110431.html here and attempted to change the idle, going by the tutorial when i have removed the electrical connector on the AAC unit my car idles at 900rpm, so i assumed that the computer needs to be adjusted as indicated by the tutorial, when i turn the little screw on the comp it does nothing

any suggestions as to whats wrong?

one possibility that i thought is that although the injectors are the same capacity as previous they are in much better condition and may flow better, could this be the cause of the high idle?

it may be possible but have u tried adjusting the screw on the aac valve itself...

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Resetting will put it to a default / factory setting (this is of courcse assuming you are running the factory ECU).

The adjustment on the ECU is a fine adjustment. The adjustment you need is on the base of the AAC valve.

Did you replace the gasket on the AAC valve - high idle is indicative of an air leak.

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i replaced all gaskets with gasket glue, the idle was fine befor i did the injector change and when i unplug the electrical connector on the aac valve it idles back on 900rpm which is what im after but once i plug it back in it goes back up to 2000

perhaps ill adjust the aac valve when the electrical connector is plugged in

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iv played with both the valve on the aac unit and the one on the ecu with no effect, iv checked for leaks and i cant find a thing, is it possible that it is due to the tune(when i had the car tuned the injectors had a leak and therfor more fuel was needed for start up and im assuming idle) could this cause the high idle iv got now considering these injectors are not leaking?

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Check your idle on startup, if it is the same as when warm then it is likely to be your IAC valve and it often causes problems. You'll need to pull of your main intake pipe and its best to remove the throttle body as well as it sits underneath this. It has a hose running to the bottom of it and one to the top.

The problem is the valve is pulled shut by a spring by default. This spring often deforms or snaps so the valve remains open when engine is warm and is constantly delivering too much air and raising your idles. You can open up the IAC and reseat the spring.

Edited by Kwyjibo
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id like to know how you go with it. my revs have been playing up too. cleaned the AAC but it came back 2 months later. Cleaned AFM and that fixed it for about 2 weeks. Car would idle normally on first startup and then play up after abit of driving. Could a possible leak from the vacuum hose that goes into the EBC be the cause?

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pulled it apart yesterday, the little spring was in perfect working order, turned out to be the little sensor thing that is attached to the throttle body, when you pull it apart it is conected to the throttle so i shifted it slightly which caused idle to drop to where i want it

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straying a little the valve underneath the throttle body (IAC) does it have anything to do with the A/C throttling up when it is turned on?

when i turn on my air condition it throttles down the car and sometimes coming to a stop it shuts off. i cleaned the one to the back of the plenum and i have seen no change. what could it be?

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