| Welcome to Altezza Club Of NZ/Australia. We hope you enjoy your visit. You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free. http://s4.zetaboards.com/lexusaltezzaclub/topic/1148393/1/#new |
| Idle Air Control Valve | |
|---|---|
| Tweet Topic Started: Jan 7 2009, 04:58 PM (3,759 Views) | |
| Leiden | Jan 7 2009, 04:58 PM Post #1 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Where abouts is it, I've read that its located on the throttle body, is it the part located inside the throttle body on the left just before the butterfly valve? Or is it the solenoid connected to the bottom of the throttle body with a short 4mm hose? |
| Project Thread | |
![]() |
|
| xnickx | Jan 7 2009, 05:03 PM Post #2 |
![]()
^^ You may thank me ^^
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Do our cars have one? Thought the fly by wire throttle deletes the IAC I've yet to come across one anyway |
Contacting me for parts![]()
| |
![]() |
|
| Leiden | Jan 7 2009, 10:25 PM Post #3 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
I'm starting to think we indeed dont have one... checked all over ToyoDiy and couldn't find anything at all... Maybe its a 1GFE thing? Just heard stories of people cleaning theirs and fixing crappy idles... For some reason mines stalling randomly when dropping back to idle, or shaking a little and recovering. Just did a reset, no O2 connected |
| Project Thread | |
![]() |
|
| Soiled Altezza | Jan 7 2009, 10:34 PM Post #4 |
|
...
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Mines been doing the same thing again this time only periodically though, going to clean AFM and Throttlebody tomorrow. Jason hooked up a diagnostics computer thing awhile back when I done my clutch with him and it looked like the AFM was giving out little to no voltage while at idle. Didn't quite seem right. Boost leaks can also cause this so check all your joins and gasket/piston on your BOV to ensure nothings passing by. Resetting the ECU will probably fix it for awhile as it will idle higher. |
![]() Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0 | |
![]() |
|
| Leiden | Jan 8 2009, 12:22 AM Post #5 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Strange it should be around 1.12v at 700 rpm idle? I'm thinking its either rich or lean due to the turbo kit and vacumme associated with restrictive intercooler piping, Probably because the MAF is before the turbo, so measured airflow is slightly delayed before it gets to the engine (intercooler piping) Will jump on the eManage Software tomorrow and see whats happening, I think last time I had to add fuel to get it to idle smoothly, Noticed the Greddy Turbo Kit basemap actually pulls 13% airflow at idle - 0% throttle position, Will also try doing the MAF and throttle body, see if it helps anyway... |
| Project Thread | |
![]() |
|
| xnickx | Jan 8 2009, 06:49 AM Post #6 |
![]()
^^ You may thank me ^^
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
HMmmm funny mine too! Happens most right after I've hit boost then straight to idle, it just dies. I'll clean the air flow sensor first and see how it goes, I'd suspect it should be the air flow sensor as with the pod more air gets drawn through it and I'm not sure how good the GReddy Airinx filter compares to the stock filter LOL |
Contacting me for parts![]()
| |
![]() |
|
| Soiled Altezza | Jan 8 2009, 09:34 AM Post #7 |
|
...
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Been thinking recently of buying a K&N pod to replace the GReddy one, never been too keen on the foam ones. |
![]() Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0 | |
![]() |
|
| Leiden | Jan 9 2009, 03:26 AM Post #8 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
I've got a Simota (crap) pod filter, same thing... Wonder if its to do with all this warm weather? |
| Project Thread | |
![]() |
|
| cpufix | Jan 9 2009, 06:25 AM Post #9 |
|
Paraparaumu, Wellington
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Have you tried cleaning the Idle Sensor sitting in front of the throttle butterfly, which I suspect is what Lieden is reffering to. I've had idle problems, cleaning MAF did not cure but cleaning the Idle Sensor did resolve. |
![]() |
|
| xnickx | Jan 9 2009, 06:54 AM Post #10 |
![]()
^^ You may thank me ^^
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
That sensor is called a Throttle Body Thermostat according to Toyota, quite weird actually when I removed the hoses going into that sensor water/coolant came out. The hose going into it is just a water bypass hose, wonder what the sensor actually does? http://www.toyodiy.com/parts/p_J_199811_TO...AEFVF_2211.html But yes I cleaned that in the past and it did help |
Contacting me for parts![]()
| |
![]() |
|
| cpufix | Jan 9 2009, 07:12 AM Post #11 |
|
Paraparaumu, Wellington
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
So the sensor is preheated to the current water coolant temp. So in fact the sensor could be adjusting the idle in relation to the engine temp. |
![]() |
|
| Leiden | Jan 9 2009, 09:24 PM Post #12 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Honda's have a similar thing where they pass engine coolant around the throttle body to help warm it up... I dont see the point, I wonder if I could just loop the hoses onto each other and leave the throttle body out of the circuit? Wouldnt it be better to not have the throttle body heated? EDIT: Ahh think I found out how it works, Inside that little what-ever-you-call-it-throttle-body-do-dad is something called 'thermowax' which adjusts idle according to coolant temperature, so aparently pulling the coolant hoses off will make the engine idle like it was cold, until the throttle body heatsoaks up to temperature... Not entirely sure if thats correct, will research some more and report back team! |
| Project Thread | |
![]() |
|
| Leiden | Jan 11 2009, 07:20 PM Post #13 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Haven't played with the heater hoses to the throttle body yet, mission for another day... I'm wondering if the crappy idle could be caused by the injectors? If they were leaking, or injecting unevenly then it would cause problems right? I have fixed the surging by adding 10% more airflow at 700rpm, now the problem is when the radiator fans come on, idle goes all over the place, Maybe it would be worth having the O2 sensor connected just long enough for the stock ecu to adjust the idle till its smooth and make its idle fuel trims etc, then disconnecting it when idle has sorted its self out? |
| Project Thread | |
![]() |
|
| roman | Jan 22 2009, 10:16 AM Post #14 |
|
Lowered
![]() ![]() ![]() ![]() ![]()
|
Waxostat idle speed controllers are pretty oldschool, doubt the altezza uses them. The reason for coolant pipes going to the throttle body... is so that it doesnt freeze shut! When you're sitting at low throttle positions for a long time, the pressure drop from one side of the throttle plate to the other causes a big temperature drop. If there's high humidity (and presumably very cold temperatures to start with) you can get condensation/ice forming in your intake. Coolant lines to the throttle body are there to warm up up, so it doesnt freeze haha. I've looped out the lines on a few cars, and never had any problems. I think it's potentially more of an issue in colder climates than NZ. And yeah, with the fly by wire throttle, I dont think that the altezza uses an idle speed air bypass anyway? |
![]() |
|
| Leiden | Jan 26 2009, 10:07 AM Post #15 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
So what exactly is that sensor looking thing inside the throttle body? |
| Project Thread | |
![]() |
|
| Mos | Feb 3 2009, 11:47 AM Post #16 |
|
Stock
![]() ![]() ![]() ![]()
|
I'm with Roman - would not have thought they would have thermostatically controlled idle up valve in this day and age. I'll have a look through my 1G-FE manual but iirc it's only for heating, and all idle control is done through the electronic throttle, fueling and ignition timing. (Just looked at the EPC, and it looks like there is a non-electronic throttle body version of the 1G-FE in the GXE10 - without traction control - and that one does have an idle speed motor on the throttle body, but the electronic one does not). Leiden - if it doesn't have a connector/wire harness running to it, it's not a sensor. Do you have any photos of the component you're referring to? Looking at the EPC it looks like it does have some sort of thermostatically controlled idle up valve. It looks like it's removable and replaceable too (in previous designs you had to buy a new throttle body). This kind of valve, however, does not have fast response - ie it changes the amount of air going past it based on its temperature - so it's not likely to be the source of erratic idle problems at temperature. You could probably pull it out and clean the channels (maybe). Mos. |
|
Admin, Founding Member, Toymods Car Club Inc. 2000 IS200 Sports Luxury 1UZ-FE VVTi 210rwkw Previous: 1991 MX83 Grande 2JZ-GTE 222rwkw, 1984 AE86 Sprinter 4A-GE | |
![]() |
|
| adian | Oct 8 2010, 03:54 AM Post #17 |
|
Soccer Mom
![]() ![]() ![]()
|
OK I'm reviving this 1.5yrs old thread, coz I'm now facing the exact same situation as you guys! Running a HKS GT-SS kit on my 3S-GE with HKS F-CON iS piggyback and 540cc injectors, O2 sensor disconnected, HKS powerflow air filter. Idle is definitely a bit crappier since I disconnected the O2 sensor, but then again that's not to say that it was doing all that much better with it connected either! Question 1: Did you guys sort these issues out, or have you been driving around for over a year with a car that occasionally dies when you lift off?? Question 2: It's really bugging me. Wish there was a way I could somehow override the auto-idle (god knows how it's doing it if it doesnt have an ISC valve). Is there a screw or a whole we can jam open or unplug that would solve the problem? I notice that the issue only seems to afflict us that have bolt-on turbo kits, and not the NA blokes.. |
![]() |
|
| xnickx | Oct 8 2010, 05:13 AM Post #18 |
![]()
^^ You may thank me ^^
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Mine was all fixed after a tune, no hardware changes and now purs at idle and doesn't die at all |
Contacting me for parts![]()
| |
![]() |
|
| Leiden | Oct 8 2010, 10:03 AM Post #19 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
I eventually just disconnected the water lines to whatever that do-hickey is and never noticed any idle problems, its either a prehistoric idle up (maybe in extremely cold conditions) or used to prevent the throttle body from freezing shut (again in extremely cold conditions) I'm running the Caldina GTT throttle body with the water lines disconnected and idle is near perfect, it does however have a separate computer controlled ISC valve. |
| Project Thread | |
![]() |
|
| adian | Oct 10 2010, 01:57 AM Post #20 |
|
Soccer Mom
![]() ![]() ![]()
|
xnickx: Cant tune the idle speed, I suppose you're referring to mixture? leiden: Caldina turbo TB with an ISC valve controlled by it's own computer, how do you get that to talk with the stock ECU? Or you're running a standalone ECU now? |
![]() |
|
| Leiden | Oct 11 2010, 07:40 AM Post #21 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
You can muck around with the TPS adjustment and fine tune things on the Beams TB, there's a proper spec you're supposed to set it too though. Mine was about 0.78v with the ETC fuse removed. I meant the ISC valve is controlled by the standard Caldina GT-T ecu, its just the factory setup on 3SGTE's, no fancy ETC to reduce throttle response. |
| Project Thread | |
![]() |
|
| adian | Oct 12 2010, 03:08 AM Post #22 |
|
Soccer Mom
![]() ![]() ![]()
|
Yup will adjust the TPS and see what happens and report back. Last I fiddled with it tho it messed the tuning slightly as well tho, since I mapped TPS vs RPM. |
![]() |
|
| Leiden | Oct 12 2010, 03:42 PM Post #23 |
![]()
NZ, Whangarei
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
Could you not use MAF vs RPM? |
| Project Thread | |
![]() |
|
| alexlegault | Aug 8 2012, 09:13 PM Post #24 |
|
Soccer Mom
![]() ![]() ![]()
|
hope someone here has figured it out. im still trying to get mine running smooth. can someone give me a tip on how to get rid of the dropping rpm. applying full breaks in neutral ,powersteering at full lock and the airconditioner making my engine loose rpm to the point of stalling sometimes. my swap cant maintain a steady idle. its driving me nuts Also if anyone has a O2 sensor for the sxe10 M/t for sale i need one. thanks |
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · Engines • Intakes • Exhausts · Next Topic » |






![]](http://z4.ifrm.com/static/1/pip_r.png)







8:39 PM Jul 11