Idle Moving Around Rb25Det

[joe blo]

hi guys been having a problem with my rb25 in my r32 for about a week. just started all of a sudded

it has a blow off valve that i think is plumbed back and not atmospheric venting. i dont believe it is the blow off valve stalling issue thats very common with atmo blow off valves. had that on my r33 and this isnt same.

what is does is sometimes it idles at normal speed around 1000rpm or so. sometimes it will rev up and down 200rpm from about 800-1000rpm. sometimes if i sit in neutral it will idle good then change into the fluctuating idle thing.

its really getting on my goat so need yas to tell me whats wrong.

thanks guys

[Manuel Kasko]

Getting on your goat haha!

-clean your AFM (electric contact cleaner)

-clean your AAC valve (Carby cleaner)

Walk through for the AAC in the tutorial section.

AFM you should be able to do yourself

Then report back.

Also make sure that it's not ATMO it's as simple as popping the bonnet don't just guess it is

[joe blo]

il do those things.

the reason i think its a plumb back is that it doesnt have a trumpet and cant see a venting bit on it. and seems to have a pipe that looks like it goes back to somewhere. have studied it wen i got the car and came to the conclusion it must be a plumb back but will look again

[Manuel Kasko]

Yeah just follow it and be positive it heads back towards the intake.

Could be venting somewhere down the side to hide from police or something stupid like that.

I found it for you just incase.

http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/

[89CAL]

Do as above, adjust your AAC to proper idle revs (about 850rpm or so) and reset ECU (only if it is standard ECU)

Could probably do the ECU before adjusting the AAC

[joe blo]

i got out of it easy luckily. looked at motor for abit before i went any further. spotted a broken vacuum line from plenum to cant remember. replaced that and problem fixed.

thanks for the suggestions but. probably would have left it for ages if i had to do that aac thing. alot nicer now but