yea, so i don't have a constant idle. And i'm working through what it might be. I just replaced my AAC, and it helped some....but i still get idle at 1700 rpms every once in a while. The temp sensor is working fine, and i don't have any vaccum leaks. so there must be a fast idle valve or something like it on the throttlebody. Anybody know anything about this business?
P.S. what do you guys know about the SAFCII and different MAFs. i have HEARD that you can run the cobra or 300zx maf, and not have to recode the ECU with the SAFCII. I also heard you can run open atmospheric, so you can put a BOV on and not have the computer freak out about lost air.
AAC, IACV, Idle stuff....and SAFCII junks
it will idle high at random times...even when it has been running for a while. So, it idles high when cold and when warm. i understand why it would idle high when it's cold, but not after it has warmed up. PLUS, the idle is random, it's not always the same...but it's always higher than it should be when the car is warmed up.
I have had this problem a lot with my RBs. A RB20DET should idle at 650rpm when it has warmed up. Your problem sounds like a vacuum leak. I know you said you check already. But you should check again. You will be surprised all different places this engine leak vacuum from. Check to make sure all your bolts are torque on your throttle body and intake manifold. Check all of your clamps on you intercooler pipeing. Check to make sure you don't have a small hole in your intercooler. Check all your vacuum lines in and around the intake manifold that always dry rot crack from the heat of engine. Their is a idle adjustment screw on your AAC try playing with that a little. If you put the Z32 mafs on your car without using a SAFC or a tuned computer for the Z32 it will cause a high idle. The reason for this because the Z32 is a Hot Wire Type 2 sensor and the RB20 is a Hot Wire Type 4 sensor. Trying using a can of break cleaner or WD40 to find vaccuum leaks by listening to change of idle of your engine.
