R33 Rev Hunting Issues Timing

[Blakeo]

Hi guys, when I bought my R33 gtst it had a stalling issue if I came up to the lights and took it out of gear or pushed the clutch in (only happened sometimes). From advice I had read, I decided it was the IAC which I preceded to clean the gunk out with carby cleaner and reinstalled.

Stalling issue fixed.

I marked the screw before removal on the IAC and set it back to this. Car idles at 900rpm warm and about 1100rpm when cold (approximately). On the sticker under the hood it says rpm should be 650rpm.

Have I set the idle too high?

The car now rev hunts on idle, it only does it sometimes. It will rev from 900->700->900 repeatedly, is this normal? How can I fix this?

Will this effect the timing on the car? I am in the process of changing the timing belt and I read on here that the idle can change the vct which changes the base timing?

I have lined all marks up with their factory position, I have ordered a timing light and plan to make 100% sure the timing is correct but the rpm changing the timing has confused me (doesn't it only usually do this at a certain rpm where it changes the camshaft phasing like vtec yo?)

[Ben C34]

Ignition timing is different to cam timing.

[89CAL]

650rpm I find is too low for the idle. I always set mine at about 800rpm

If your IAC was indeed clogged with gunk, setting it back to the same spot will not give you the same idle as before. You will need to do a proper idle adjustment to find the correct idle speed

Adjust as follows (The main bit to look at is near the bottom of the screenshot)

In addition to this, I would reset the ECU (if you are still running stock ECU). I had an issue with idle when I installed an Atmo BOV then changed back to a plumback where the car didn't want to idle right. Messed with heaps of stuff then reset the ECU and that seemed to fix it. Easy to do, unplug battery > stand on brake pedal, turn on lights etc (basically anything to drain the residual power in the car), also wait about 15mins or so after this if you want to be completely sure > plug battery back in > Start car and let idle for a while. Forget how long it does its self learn thing. Think its about 5-10 mins

Report back after doing these things