Rb25det High Idle

[ArchGabriel]

hey guys, i have a R31 with a RB25DET in the engine bay thats causing me some headaches. cold start she is very grumpy to get started... cough's n splutters for a little bit then comes fine ish...... idles @ around 2000rpm after 5 mins of working away she hits a pretty cock solid 1500 and stays there at idles... ive checked my CAS position thats fine.. cant find any vacuum leaks and cleaned out my AAC valve thinking the pin may have been seized but its not.. starting to go crazy.. any help appreciated

RB25DET completly stock execpt

Pod

FMIC

SSQV BoV

cheers Matt

[scotty nm35]

I would say you have a leak somewhere. Start with the easy ones.

Stuck, dirty or loose throttle butterfly: clean or repair.

Faulty PCV valve: Replace

Split or leaking hoses to manifold: Replace them anyway

Leaking manifold gaskets: Spray carb cleaner around as many inlet gaskets as you can get to, while idling, and if the revs change, you found it.

If all else fails, block all the hoses to the manifold one at a time to see if that weeds it out. Could be brake booster or any part that uses manifold pressure.

[ArchGabriel]

where might one find said PCV valve? bit new to import engines really :S

[scotty nm35]

Plastic breather on top of rocker cover, pipe goes to the manifold. If you slide it out and shake it you should hear it rattle.

[geraus]

Are you a running stock ECU? because if your running an SSQV with a stock ECU not plumbback then your car might idle funny bro... if not then trying cleaning your AFM and your oxy sensor and your AAC valve.