Please Help, Noob Learning, Have I Found The Problem

[R34gymjunkie]

Ok guys I have wrote this up a few days ago and done Alot of research, my car at idle is bouncing from 1200rpm to 2000rpm, I have a r34 gtt, I've been reading all day and I've replaced the afm, didn't fix it, tried fiddling with the tps, it jst changes the idle rpm but stil was jumping, I think tps is the one closest to the radiator on the tb? Ok now I tried the one at the rear of the tb, and it didn't change the revs or how the engine ran at all, I tried disconnecting it and still didn't do anything so I'm guessing this is the problem? I'm hoping it is cos I'm hopeless at working on cars and if it is I'll be stoked with myself lol, of this is the problem can any1 tell me what this sensor is called so I can get another?

[mad082]

have you tried cleaning the IAC and AAC valves? (do a search on here). they control the idle speed. also resetting the ecu

[R34gymjunkie]

I can only find the DIY AAC valve cleaning thread not the iac?

[R34gymjunkie]

Ok so I cleaned the AAC and the aicv, did nothing, even when I unplugged the AAC at idle it didn't change the revs at all...

[R34gymjunkie]

Pull all intercooler Pipes off, inlet manifold and checked for cracks/split hoses and anything else that doesn't look right, everything seems to be fine, I noticed the butterfly in the tb is open when the car is off? Not sure if that's correct or not? Car is not blowing any smoke and is still jumping while at idle and is consistent, no powerloss, the sensor on the front of the plenum does adjust the idle so I know that's still working, the one at the back still does nothing to the idle when playing with it, even of unplugged so I'm still guessing this is the problem, I notice there is a bit of blowby in the piping but not a lot, checked radiator fluid and the oil, put everything back to stock including stock boost solenoid and blow off valve, still nothing, checked vac lines, hose clamps, battery terminals, afm, plugs were done a month ago ngkbkr7es, cleaned pod filter, reset ecu, still go no idea

[Moodles2]

List everything you've done (I mean everything, mods, tweaks, servicing etc) between when the car was working properly (idled at normal revs), and now.

Take a look at the charcoal canister (black cylinder with 2 or 3 hoses connected) and see if you haven't blown one of the hoses off when you upped the boost pressure.

I don't know about RB25 Neo's, but I think NGK BKR7ES plugs could be the wrong ones (BCPR7ES might the correct one)

[R34gymjunkie]

Checked the canister, all fine, pulled the main pipe that goes to front of the turbo off and no splits or holes, checked the alloy piping that goes into the induction pip and looks fine also, it has to be the sensor on the back of the plenum...

[R34gymjunkie]

All I did was put the boost controller, I put it on backwards at first n hit fuel cut, I then switched it back n I was idling high, it then got worse n now it jst revs from 1200 to 2000 consistently on idle...

[R34gymjunkie]

http://www.skylinesaustralia.com/forums/topic/379225-hunting/page__hl__hunting%20idle the video in this thread, is exactly what it's doing ....

[Moodles2]

"put everything back to stock including stock boost solenoid and blow off valve" ... what blow off valve was on there before?

[R34gymjunkie]

Just a turbo smart one not sure on type, it's not the bov, I've tried stock n I also tried blocking it off n still revs up n down