Stalling, Idle Troubles, Any Ideas?

[shaunzo101]

Hi all, yes i do realise there is a number of threads about idle issues which i have read through but none of them come out with a successful solution. I have an r33 series 2 rb25, the car will usually have that hunting issue where its going between 0 and 1000rpm, sometimes it settles at idle and other times it will just stall. I have cleaned out the iac valve completely, replaced the gasket on the iac valve and secured all hoses i have touched and it hasn't made any difference at all. Does anyone know what to do to fix this?

[116.hks]

does the vehicle have any mods firstly and does it blow black smoke from exhaust at idle. if so make sure you have not blown an intercooler pipe. also could be a faulty afm. hope this helps

[paulr33]

disconnect battery (bolt attaches to boot frame)

pump the brake pedal a few times

reconnect battery (bolt attaches to boot frame)

start car and let idle

it should sort itself out

if it doesnt go see a mechanic

base timing etc is probably whack

should be 15det BTDC at idle

[wolverine]

i'm still tipping vacuum leak.

there are numerous hoses that might not have been checked from the front of the plenum to the carbon canister and under the cross-over pipe. this is worth another check. apologies if you have checked every single one.

[Kujotk]

i'm still tipping vacuum leak.

there are numerous hoses that might not have been checked from the front of the plenum to the carbon canister and under the cross-over pipe. this is worth another check. apologies if you have checked every single one.

you would hear a vacume leak though.... i did with mine.....

clean afm, change plugs,clean throttle body, do you have standard bov? i recon the most important culprit is the 02 sensor..... that $70 f#&ker stuffs things up when not working,,,,,, fixed my idle prob and now gives me better fuel economy...

[paulr33]

u can unplug the 02 sensor and see if it helps

for GTST its on the dump pipe just after the turbo, before the CAT

vacuum leak wont give fluctuating idle

[wolverine]

sure it will paul.

i have had at least 4 deteriorating hoses on my car (over the years) and i have lost count of the cars of friends with splits in various vacuum hoses that hunt at idle. immediately idling fine after replacing the hose or trimming it back.

the last time i got the car back from the panel shop they forgot to reconnect one of the hoses to the carbon canister but due to its location under the snorkel it was a job to find in the dark with a little torch.

[Brocaine]

Vacuum leak seconded. Check EVERYTHING, not just the hoses you've touched.

[shaunzo101]

does the vehicle have any mods firstly and does it blow black smoke from exhaust at idle. if so make sure you have not blown an intercooler pipe. also could be a faulty afm. hope this helps

its fairly stock, apart from front mount intercooler and boost controller, it doesnt blow any black smoke at idle. im going to look into checking the error codes i was given that idea by a friend.

disconnect battery (bolt attaches to boot frame)

pump the brake pedal a few times

reconnect battery (bolt attaches to boot frame)

start car and let idle

it should sort itself out

if it doesnt go see a mechanic

base timing etc is probably whack

should be 15det BTDC at idle

thanks il give that a go tomorrow. theres a place near me called rpm performance north of brisbane, so that was my last resort if i couldnt sort it out myself.

you would hear a vacume leak though.... i did with mine.....

clean afm, change plugs,clean throttle body, do you have standard bov? i recon the most important culprit is the 02 sensor..... that $70 f#&ker stuffs things up when not working,,,,,, fixed my idle prob and now gives me better fuel economy...

il give this a go tomorrow as well. the bov is stock. after i try all this if im still having problems, il look into new 02 sensor.

[Kujotk]

$20 its the 02 sensor, especially if it hasnt been changed...... diconecting it wont change a thing if its not working in the first place paulr32...... what ever it ends up to be is just general standard maintenance anyway..... alll these things should be done anyway

[Melbourne93R33]

PLEASE HELP!!!!!!

Im having the same problem with the idle fluctuating (hunting). changed plugs cleaned iac throttle aac etc etc and it hunted usually between 1500-500 just changed the coils to splitfires now it does it 1000rpm-2000rpm. it isnt consistent it is intermitent. also car will just stall when clutch has been pushed in (giving it to it or sensible driving) checked ALL Vac lines aswell. also some times it will rev to roughly (i say that coz its never on the same spot its a bitch of a thing to trace) 3500-4500 and before i changed the coils it misfired then until the boost climbed it wouldnt rev anywhere near as quick then slingshot me (very dangerous in the wet) now after the coils are changed it does the same thing but it doesnt sound like its missfiring its alot quiter but same feeling NOTE: day night rain hail or shine it will do this problem sometimes does it when the car is cold but definatly when it has warmed up. sorry for the billion words hope it makes some sense

car details:

Series 1 r33 manual gtst

RB25det

splitfire coils

standard ecu

afm looks good and clean

vac hoses checked and some replaced

standard BOV

t4 turbo (was on the car when i bought it) standard exhuast manifold

standard exhaust

also just one more thing if someone has a couple of pics of a stockish engine bay can they post them

Edited May 24, 2009 by Melbourne93R33

[chinii]

i have a 93 series 1 r33 & having the same problem when clutchin for a stop the car stalls. but dere seems to b air leek jus ontop of the injectors deres a hissing sound i mite check that out n change spark plugs n see

[Weapon]

^^^^ leaking injector o ring bud

[adamskill]

whats the best way to clean O2 sensor? or is it easier to replace it? sorry for the hijack.