Idle Problem :(

[schnorky]

hey guys

my r33 s1 starting to idle funny :S

at the lights it will be fine but as soon as i put some throttle on and back of quickly the revs drop past

the idle point and it almost stalls but it bring its self backup to the idle

i have a feeling it could be a aac valve needs to be cleaned

but correct me if im wrong what else can it be?

cheers everyone

[scotty nm35]

Do a search for idle issues mate, it probably needs the airflow cleaned too.

[schnorky]

i cleaned the airflow meter recently

im looking at idle problems but cant relate it to mine

[Ruff Ryda]

Vac leak is possible but I reckon it might be timing. Make sure if the engine is getting a little older then you the advance the timing more than what the manual recommends. You might be running too lean or rich, if it's lacking high rpm performance then I'd say it's too lean. Either way don't cain it, get it checked out ASAP.

Also make sure your spark and O2 sensors are ok.

[schnorky]

it couldbe a vac leak coz i herd a lil hissing before but its getting louder and louder but i can find it !!!

sparks good dont know bout o2 sensor

cani increase the timing my myself?

i was going to get a tune up soon because i think its running a bit rich

but yer still clue less

[Ruff Ryda]

Yeah take it in somewhere man, any performance shop should be able to help or even a mechanic. However the performance shop will offer to tune it as well while you're at it. If you've got a few mods may as well go for a Nistune .

Otherwise just get a stock remap.

[SKYPER]

I agree. Go to somebody who tunes Nistune and ask them to plug laptop up to car and check that TPS (Throttle Position Sensor) is touching idle contact (can see this in Nistune tuning software) or go to Nissan and use Consult. If not touching idle contact (I think ECU switches to idle tables) or TPS fault code shows up, that's the problem. AAC valve is often blamed, but most overlook the TPS. TPS is used by ECU for transient throttle enrichment or adds fuel when throttlebody suddenly opens (like an accelerator pump on carb engine) and when misadjusted or faulty, ECU thinks engine needs more fuel than it does, so floods engine and revs drop. You'll notice the problem more on steep hills where engine has load on it or with aircon, etc on and moving car around a parking lot. Sometimes engine can stall out of the blue when slowing down.

Edited February 17, 2010 by SKYPER

[schnorky]

Makes sense, thankypu or the info where's a good place that does nistune around sydney

near castle hill area

an how much will it cost cheers

[Ruff Ryda]

http://www.nistune.com/ and then look under Workshops. Found this one:

MRC Dyno Services and Performance

26/44 Carrington Road, Castle Hill, NSW

Contact Mark on (02) 9634 5399

mrcdyno [at] iinet.net.au

http://www.mrcdyno.com.au

A decent tune and Nistune chip will cost around $750 give or take roughly but call them and ask for confirmation.

[T3zZa]

I honestly recommend cleaning the AAC valve first before you take it anywhere for a paid service. I had idle problems also and after I cleaned my AFM, upped the idle, reset the ECU to no avail I cleaned the AAC valve and voila it runs shmick now!

[kb-r33]

i've got the same problem. might get it checked by a mechanic.

[schnorky]

leT me know what your mechanic days man

going to clean my aac valve today if it's still playing up

I'll look at the tps my mates work shop they do nistune there

but he said I need to get a 300zx ecu and nistune that is that right?

[Ruff Ryda]

leT me know what your mechanic days man

going to clean my aac valve today if it's still playing up

I'll look at the tps my mates work shop they do nistune there

but he said I need to get a 300zx ecu and nistune that is that right?

On the Nistune site I couldn't see any R33 boards, only R32 and R34. A modded 300ZX ECU to suit the R33 could do it but I'm not totally sure. If your mate is good with his Nistunes then I can only say he's correct since the R33 Nistune isn't an option.

[wesley1]

I honestly recommend cleaning the AAC valve first before you take it anywhere for a paid service. I had idle problems also and after I cleaned my AFM, upped the idle, reset the ECU to no avail I cleaned the AAC valve and voila it runs shmick now!

Excuse my ignorance team, what is the aac valve and where is it located ?

sORRY, NEW TO THIS AND MY CAR IS DOING THE SAME THING.

[SECURITY]

check for cracks in your intercooler/silicon hoses. best way to do this would be to block off the intake and pressurise one of your vacuum hoses on the intercooler piping.

if you dont have a compressor then get some soapy water and spray it on all of the silicon hoses and look out for little bubbles.

[schnorky]

hey guys just cleaned the shit out of my aac valve and my car is running better then it ever has:)

more reposne no drop at idle i recommend everyone to do this diy , such a small thing made the biggest difference

cheers for the advice guys!!

[T3zZa]

Excuse my ignorance team, what is the aac valve and where is it located ?

sORRY, NEW TO THIS AND MY CAR IS DOING THE SAME THING.

Wesley1,

Do a search on "DIY clean AAC valve and reset idle" and there is a great post and massive reponses on how to go about it.

All the best,

Cheers.

[HEKT1K]

OP, did you end up finding that vac leak?

[kb-r33]

Hey guys i've got a problem with my car now =[ it drops to very low idle and nearlly stalls when i clutch it in, alsotheres white smoke comming out of the exhaust when its on idle and when sitting in the car and boosting it, it smells like bloody petrol leak or somethink and i have a little turbo lagg also. bloody hell!!! got any ideas whats happening?

[wesley1]

Wesley1,

Do a search on "DIY clean AAC valve and reset idle" and there is a great post and massive reponses on how to go about it.

All the best,

Cheers.

Thanks mate

Much appreciated