RB25DET in Z32 Idle bouncing

[whereda40at]

I just got a Z32 with a S2 RB25DET. It is a stock motor with the factory s2 ecu. rb25 maf. MAF, Turbo, plugs, fuel pump and IACV have all been replaced. The idle bounces up and down. I have only drove it around the block once.
Here is a video of what it is doing. If you can help me figure this out, I'll paypal you $1!

RBZ32 start up - YouTube

[redline racer510]

You have a vacuum/boost leak

[cherry123]

Hi ppl, great to find this forum and info available around here.
I recently got a toy heli (worth $40~$50), 4Ch, coaxial, IR controller
It was an eye opener to this world of RC heli. Of course the heli is very unstable, the yaw is damn too aggressive, and no matter how much I trim this thing (I was surprised to know it has trim) it gets out of balance the moment I liftoff. so once in the air, its a constant compensation to the heli instability with the direction stick (which i believe is common actually to most cheap helis AND the more expensive ones).
Dynam Super Cub PA-18
Anyhow, I want to invest into a good RTF heli/tx combo. budget is up to 300 $S, (not inclusive of repairs, that's on separate budget) and thought about Walkera master CP. Now i know CP is not for beginners, yet my practice I can do with the toy heli (mostly nose in flight). I read its a good heli to start as its plastic, durable (in comparison to non plastic), cheap to repair, and available here in singapore. I wonder if it offers a better stability. also wondering if any way I can setup the CP to act like a FP - and at later time when more XP, can use the CP attributes.
I read this funny review here (bias I'm sure) but they do have some valid points .what u guys think?
I did search the forum could not find feedback about master CP for beginners.

[Mitsubayati]

Lol. Mine does the same thing! When I adjusted my idle lower it seemed to fix the issue. There's a mechanical adjustment on the throttle body. Adjust it from there. I doubt it's a vacuum leak.

[whereda40at]

I will try adjusting the idle control lower. Also I noticed that I have 2 plugs on the throttle body but only one has a plug connected? Anyone else see that in the video?

[whereda40at]

The idle only bounces at start up and after you drive and are not in gear. I screwed the idle adjuster all the way in, the idle only dropped a little bit. I was able to unplug the tps and the cars idle changed but didn't shut the car off or go crazy. Still trying to figure this out.

[whereda40at]

I'm going to clean the iacv when i get a chance. Anyone have any other suggestions?

[Chaluska]

a vacuum leak will typically lead to a higher RPM all the time. a big one like unplugging the brake booster will rev the engine to around 3000 rpms +

id start at the IAC, and then check to see that the MAF is reading proper voltage, check the TPS voltage adjustment, and make sure the Tps is closed all the way. IAC is there for a reason..

[whereda40at]

I cleaned out the iacv and it was very dirty. Idle is still very high. I can't find a fsm for a rb25 series 2 motor. I want to make sure all lines are proper and find out what the proper voltages are for things.