R32 Gtr Idle Hunting 1300-1800rpm

[gtr fan]

Hello,

My R32 GTR has an idle problem as it constantly swings between around 1300-1900 RPM. No other issues when driving though just when engine is meant to be idleing.

I have seen the DIY Tutorial for AAC valve for RB25. Is anyone aware if it is the same process on RB26? Also can anyone suggest what other problems could cause this idle issue?

Regards,

Rohin

[Amec]

if it isnt the idle control valve playing up then the most likely cause is a vacuum leak somewhere.

[Kujotk]

if it isnt the idle control valve playing up then the most likely cause is a vacuum leak somewhere.

i dont know if its the same for a rb26 or a 25 but when i had a leak it slowed my idle down to the point it would occasionally stall at roundabouts....

[gtr fan]

So the AAC valve is completeley seperate to the idle control valve?

How would I go about tracking down a vacum leak? Just checking all the hoses?

[blind_elk]

So the AAC valve is completeley seperate to the idle control valve?

Same thing.

How would I go about tracking down a vacum leak? Just checking all the hoses?

Usual one is to spray a bit of WD40 or similar near various joints in hoses. Revs will suddenly rise if the WD40 is sucked in.

Check the TPS for "closed throttle" switching.

Have you had the inlet manifold off recently?

[gtr fan]

Have you had the inlet manifold off recently?

Nope motor hasn't been touched for at least 5 years. Driven rarely so minimal maintenance has been required, just new injectors 2 years ago. This is my first nigly problem (touch wood).

Edited September 5, 2008 by gtr fan