Please Help Urgently!

[Starionturbo]

Hey guys

I have a RB20DET Cefiro and after many months of trouble free motoring have experienced a Idle Problem getting worse and worse.

I have read every tutorial on this website but nothing works.

I have replaced plugs, replaced vac hose, cleaned out the AAC valve etc etc.

Car Hunts for Idle now and almost/pretty much stalls when warm. Idles good on Cold start. When I disconnect the TPS the cars revs pick up to about 1200 RPM and sit steady, The Idle adjustment Screw is turned in completely. The moment I put the TPS plug back in, revs drop and it hunts and almost stalls.

Now, unlike 32 or 33s, Ceffys Have only one single plug going into the AAC valve SOLENOID. I read that if you discconect this and the car stops theres a problem with the AAC valve. My car dies as soon as I pull this.

Thats about as much as know, I dont know what it is, how to check anything else or what parts to replace. Car drives fine under power, it just cannot idle.

Thanks in advance guys hope you can be of some help!

[mad082]

there is also an IAC valve under the plenum that may be causing the issue you are having.

otherwise check the o2 sensor, the rocker cover breather hoses and the PCV valve and grommet.

[Craved]

if all else fails, try another ECU

my car didnt idle at all for a year, swapped out to the powerFC and worked straight up..

[Starionturbo]

there is also an IAC valve under the plenum that may be causing the issue you are having.

otherwise check the o2 sensor, the rocker cover breather hoses and the PCV valve and grommet.

I replaced the o2 sensor myself recently, rocker cover hoses ok.

Where exactly is this IAC valve, what does it do? Where is the PCV valve and grommet.

thanks

kim

[Starionturbo]

anyone?