Dat Hunting Idle...

[Rides]

I had the same issue. I stalled at lights and very rough starts. For me changing the cas fixed my problem. Feel free to check out my thread as I posted my symptoms asking for help. I also found out one of my maf connectors were faulty causing the car to periodically go into limp mode.


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[kai]

Hm...where did you pick up your CAS? and for approximately how much?

[steveo1502]

You can rule out the IAC valve by bumping up the idle with the throttle blade adjustment and reseting the TPS voltage to target. I had all kinds of issues with mine and that fixed most of it. I notice that my base ign. timing bounces all over the place after the engine warms up. That causes some hunting as well. Not sure why it does that, have a replacement CAS but haven't found the time to monkey with it yet.


Jon.

I had issues with my timing bouncing also, it was on an rb20, I traded a dirtbike for this gtst because he couldn't get it to run right, first thing I changed was the cas, ran perfect after that.

[kai]

Alright well i'll probably try and pick up a CAS sometime soon, in the mean time does anyone know a good place i can get a Vac rebuild kit for a r32 gtst? if im gonna put a bunch of money into this car i want to do it right, so good silicon will be insurance in a sense, and then i can check all my grounds and silly **** like that. coloured hoses would be prefered because then i know what i've changed and haven'tplus it looks a tad sexier then black..

[Dragon Humper]

I had issues with my timing bouncing also, it was on an rb20, I traded a dirtbike for this gtst because he couldn't get it to run right, first thing I changed was the cas, ran perfect after that.

Hmmm...must change mine out then (not like its hard). It's weird though, cold to almost warmed up it's perfect, idle is steady as a rock. Once it gets to about 50 degC it bounces from 5 to about 30 deg. As soon as I get off idle (as well as adjusting the TPS to turn off the idle switch in the PFC) it stabilizes, under power, it's fine. As soon as I am back to idle, bouncy, bouncy. It's much worse after sitting and heat soaking for a bit.



Jon.

[kai]

Yea after i do my hoses im gonna swap out the CAS, seems like most people have resolved this general problem with that..hopefully its easy to adjust.

[craftz]

You can use propane to hunt for vacuum leaks, idle will rise. My car idles perfect when cold but hesitates a bit when warmed up. Does not stall like yours. Your problem is worse than mine but I might be headed in the same direction. I have also cleaned IACV, new coilpacks, plugs, coil pack harness, series 2 Z32 igniter. Z32 maf is used but works fine under all loads, just idle hunting after warm. Hope I am not hijacking your thread but I am still looking for a smooth idle. My AFR's do not even move much when engine hesitates. I have also gone through all my clamps on piping. I will try another CAS if it will help but a new one is pricey. If you get anywhere let us know.

[Skym]

Faulty CAS can pull ignition timing 1-2 degrees or so. I found after changing CAS on my car that engine idled smoother. Similar result when unplugging o2 sensor.