idle drop

[G-unit]

noticed today when i come to a stop it sometimes drops in the revs really low, almost stalling but doesn't stall, then other times its ok, that the idle control valve that needs a clean? and if so is there anything special that needs to be done/ replaced when doing it?

only thing ive done is put the stock airbox back on,

[Jambun]

Give the IACV a good blast with brakeclean or the likes.

AFM could also play a part in lazy idle.

[G-unit]

bloody afm was new not long before i got the car, and i was very careful when i put the box back on not to wreck the afm, do i need ti replace any parts in the IACV? no gaskets etc when putting it back on

[Jambun]

Don't want to say yay or nay if a new gasket is a must but I got a OEM one from Armstrong Subaru $20 IIRC

[chulozumo]

Mine used to drop below 500rpm most days, i recently cleaned the AFM and it tends to sit at about 1100rpm now at idle

Have been told theres a sticker on the underside of your bonnet that says what it should idle at (think it said 750) then again i dont really know as its in japanese....>.<

[G-unit]

its ideling fine, just when i stop sometimes it goes really low then comes up, idles at about 750 just sitting there, its just when it 1st drops, it goes low, doesnt stall, i remember way back in the day on my mazda familia i just turned the idle screw up and it stoped doing it but it would stall, but that wasnt turbo

[G-unit]

also its not idle hunting it just drops then acts normal

[soopersubaru]

O2 sensor knackered...Test with multi meter...Is it the same with O2 sensor disconnected??

If so then that's what it is.

Very common if after market atmospheric blow off valve fitted and ecu not remapped to cope.

[G-unit]

that the o2 sensor in down pipe behind the turbo? i thort if the o2 was buggered it would go into limp mode and it does have a atmo bov thats the only mod

and how would having a atmo bov kill the o2 sensor?

[Stoffa]

Vacuum leak. check all your hoses

[Bazza-NZ]

 G-unit said:

that the o2 sensor in down pipe behind the turbo? i thort if the o2 was buggered it would go into limp mode and it does have a atmo bov thats the only mod

and how would having a atmo bov kill the o2 sensor?

Check the operation of the BOV, it may be too soft and causing a leak when you are coming to a stop..

Would only happen sometime as well.

[nztintin]

my vote is 02 sensor, my forester does it, was fixed when i got a new o2 sensor, then it came back when my o2 sensor died again

[Kiwi_Fozze]

mine does that because of the bov, idle seat pressure is too soft. but, if i tighten it up more i end up with compressor stall. need bigger bov hahaha

[Timmah]

 kwi_fozze said:

mine does that because of the bov, idle seat pressure is too soft. but, if i tighten it up more i end up with compressor stall. need bigger bov hahaha

My BoV doesn't have the little bolt to tighten it

[ADIKT]

 chulozumo said:

Mine used to drop below 500rpm most days, i recently cleaned the AFM and it tends to sit at about 1100rpm now at idle

Have been told theres a sticker on the underside of your bonnet that says what it should idle at (think it said 750) then again i dont really know as its in japanese....>.<

Depends if your running aftermarket computer or not... My coupe idled at bang on 800 when warm...

[Sequence]

I had the same problem as you, Turned out to be a faulty O2 sensor. It's worth getting that tested.

[G-unit]

yup off to get it tested soon, dont have a multimeter , should really buy 1

also would 1 from a TT gt fit?

[G-unit]

the only hose i found no connected to anything was 1 from the charcoal canister, no wonder i could smell fumes, thats now hooked back up, have to clean ICV and then take it back to electrician if its not fixed

update: cleaned the ICV, it was thick with crap, brake clean cleaned it up mint, sprayed inside it and its sweet now, the ICV could hardly move before i cleaned it, was yuk, would pay to clean it once a year id say, so if u havnt done it do it, very easy job

idles at 850-900rpm and doesnt go under 500 now when reved to 4-5000 revs

[soopersubaru]

 G-unit said:

that the o2 sensor in down pipe behind the turbo? i thort if the o2 was buggered it would go into limp mode and it does have a atmo bov thats the only mod

and how would having a atmo bov kill the o2 sensor?

Soots it up till it kills it! Retune required for mods!

[G-unit]

 soopersubaru']

[quote name='G-unit said:

that the o2 sensor in down pipe behind the turbo? i thort if the o2 was buggered it would go into limp mode and it does have a atmo bov thats the only mod

and how would having a atmo bov kill the o2 sensor?

/quote]

Soots it up till it kills it! Retune required for mods!

supose as they run abit rich with atmo bov, i may put my stock 1 back on. do like my blitz 1 tho

[Kiwi_Fozze]

i've noticed a bit of sooting on my back bumper from my atmo one.... i guess it may be ok if you keep cleaning it, so as to avoid staining.....

[Guest]

all of the above.you cant single out a problem

itl be a range off things

dirty afm

buggerd 02 sensor

ivac staying open abit to long causing idel to drop intil it closes

bov leaking

split vacum hose

intake pipe split or discintergrating

check all of these

[G-unit]

 sti8u said:

all of the above.you cant single out a problem

itl be a range off things

dirty afm

buggerd 02 sensor

ivac staying open abit to long causing idel to drop intil it closes

bov leaking

split vacum hose

intake pipe split or discintergrating

check all of these

id start with the icv, i should have taken a pic of mine, was thick with crap

[soopersubaru]

 G-unit']

[quote name='G-unit said:

that the o2 sensor in down pipe behind the turbo? i thort if the o2 was buggered it would go into limp mode and it does have a atmo bov thats the only mod

and how would having a atmo bov kill the o2 sensor?

/quote]

Soots it up till it kills it! Retune required for mods!

supose as they run abit rich with atmo bov, i may put my stock 1 back on. do like my blitz 1 tho

No prob with an atmo blow off......Just make sure the tune is corrected to suit!

Or eventually pay the price of incorrect tune..Dead O2, or BE failure.To mention a couple of issues your hi spec motor will suffer from being out of tune.

[G-unit]

dont think the ver5/6 stock ecu can be tuned? and i thort they learn as they go or something like that