Jump to content
SAU Community

Recommended Posts

the last few months i've had nothing but problems with my R33 . Right now i've got this stupid idle issue when the car is hot, not when its cold. What the car does is it starts fine and revs and a nice steady rate, but as soon as you blip the throttle anywhere past 3000rpm the revs go under 500 to around 0 then bounce up to 500 then back to 0 sounding like a rotory and pissing black smoke trying to save stalling then it goes back to normal. Ive cleaned my AAC Valve 2 times with good carby cleaner , new gasket for the AAC valve , New Plenum gasket , Ive cleaned the throttle body and i've positioned the TPS to what is says in Nissan RB25 workshop manual which is 0.40v. I've got a brand new Bosch 02 genuine and just bout done everything . I've searched every forum and NOBODY is having the same issues! .. I've adjusted idle with the gay TPS unplugged like it says in idle and im running PowerFC so i cant adjust it on the ECU .

NOW the only way to stop the rev hunting issue when i rev the car is to adjust that scew thingo that pushed the Butterfly open or closed on the throttle body , so my car revs at 1500RPM and eveything is fine! it revs nice and comes straight back and sits on the rev and doesnt drop! . The car even feels better to drive as it doesnt stall when i boost 1st gear and then back to neutral ..

But the only issue i dont want my freakin car to idle at 1500!!! i want it to idle at 750RPM at the most..

Not one mechanical workshop knows what im talking about and probably half you guys wont but there must be a solution before i run this car off the cliff and sell the scrap

Link to comment
https://www.sau.com.au/forums/topic/299402-idles-drops-when-rev/
Share on other sites

I already moved that thing!! where should it be? it doesnt state it in the manual??? and i already said i cleaned the AAC Valve 2 times? and i mean really cleaned it with freakin cotton wool buds and carby clean+ compressed air! .. what else can contribute?

its your blow off valve and its called pcf disease . do a search

how about you do a search under the description i have wrote? you wont find shit! i just want my freakin car to work and my blow off valve was blocked off in the test and did the same thing , i just tried my stock one and it is the same so its not that

My car did a similar thing with warm starts with the PowerFC where it would hunt. I ended up using datalogit to try to relearn the start up procedure but it got worse. Took it to the tuner and they said it was leaning out which was causing the problem. They fixed it up and ever since its been fine.

Edited by Penfold

its either your bov or if you have bloked off your bov and the recirc pipe is bloked off aswel it will do this just set ur idle to like 800 from the powerfc settings not the way you did and it will be alright

I have had a similar problem on 2 occasions

1) it was an air leak, check all your piping

2) dead airflow meter and busted wiring to the AFM

Cant promise your case is the same but it would be worth checking out

there is a new thread every week along these lines . its either an air leak ( block the afm and pump up the whole system with air compressor ) or its power fc disease . it it to do with air reversion back out the air flow meter . when you rev it up engine sucks in air when you let off the air has to go somehwere some goes out the blow off valve or in your case it all goes backwards out the air flow meter and as the air flow meter and ecu dont know the difference between air flowing in and air flowing out it sees air going in and puts lots of fuel in .

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
×
×
  • Create New...