Idle Issue after Warmed Up - R33 Skyline GTS-T

[Raja]

Hey guys,

I have a 1996 Nissan Skyline R33 GTS-T with the RB25DET engine.

I've noticed a problem that I'm having with the idle. After the car is warmed up and I go for a drive, if I'm stopped at an intersection for example, the car will drop its idle to the point of stalling, then the car will recover and repeat the process again and again (from 900rpm drops to 500rpm or less). This has happened for the past couple of weeks or so, and I remedy it by raising the throttle a bit so it won't 'idle hunt'.

I've read several forums, and cleaned the AAC valve which is located behind the intake manifold near the firewall (Idle Control Valve) with carb cleaner and put it back in. It ran fine the night I did this, then the next morning the problem came back.

I'm thinking the throttle body might need to be cleaned, but not sure.

Any help would be awesome!

[steveo1115]

Is your car throwing any engine codes while it does this.

[Shoxie]

Someone with an Evo had a similar problem and it was caused by the BOV. Have you tried checking if yours is a bit too old?

[Rygar]

Not exactly same as the Evo issue but definitely look at the BOV.

[Rygar]

Not exactly same as the Evo issue but definitely look at the BOV.

Also look at all the piping and hoses related to that system.

[jdmvip]

Did you ever get this sorted Raja? Your symptoms sound very similar to MAF problems I used to read about all the time with the R32's. Try resoldering and cleaning it if you haven't already.