samdale Posted January 29, 2017 Share Posted January 29, 2017 Car has been sat for a couple of weeks. Battery has been flat and removed/recharged. Car now won't hold idle at all. Could it be that the valve is stuck closed and needs a clean? This certainly looks to be my first port of call. What else to look at? I've taken the car out and got up to temp and still dies as soon as clutch is pressed. Car is vvti TT6. Thanks, Sam. Quote Link to comment Share on other sites More sharing options...
Nic Posted January 29, 2017 Share Posted January 29, 2017 Edit, sorry didn't read your post properly. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 29, 2017 Share Posted January 29, 2017 Dies *AS SOON AS THE CLUTCH IS PRESSED*????? Pleaase elaborate, pressing the clutch should take some drag OFF the engine, not add more... Quote Link to comment Share on other sites More sharing options...
sebas Posted January 29, 2017 Share Posted January 29, 2017 (edited) The VVTi doesn't have an idle control valve. I have vvt-i tt6 as well. and from time to time i have problems with my throttle, but different. car fire up nicely and idle well and go to the red line when you rev it, but once it is on gear and I'm trying to drive there is no response from gas pedal, nothing at all, engine is just idling and finally cutting out . Then I need to do "master reset" the throttle body and it seems be ok for a while. maybe try to reset your throttle ? Edited January 29, 2017 by sebas (see edit history) Quote Link to comment Share on other sites More sharing options...
sebas Posted January 29, 2017 Share Posted January 29, 2017 this is how to reset throttle body: Turn the key to the “ON” position but don’t turn over the car, put your foot completely down on the throttle “Gas” pedal for 30 seconds, you should hear a beeping/humming sound while the ETCS-i system resets, turn the ignition to “Off”. Now turn the car back over and re-test to see if you have any symptoms. info from 2jzgarage.com Quote Link to comment Share on other sites More sharing options...
samdale Posted January 29, 2017 Author Share Posted January 29, 2017 Dies *AS SOON AS THE CLUTCH IS PRESSED*????? Pleaase elaborate, pressing the clutch should take some drag OFF the engine, not add more... Ahh sorry. Clutch pedal depressed, (anywhere in the rev range) revs drop exactly as they should but keep travelling down to zero. Throttle and in gear driving seems unaffected. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 29, 2017 Share Posted January 29, 2017 That does sound like the idle control valve is stuck closed or almost closed. It could be physically gummed up, it could be electrically faulty, or for various reasons not receiving signals from the ECU.DO NOT be tempted to fiddle with the idle adjustment stop screws on the throttle body, nor be tempted to move the throttle position sensor. You will quickly dig a big hole for yourself and those who might have to assist in fixing what's probably a totally different issue. Quote Link to comment Share on other sites More sharing options...
samdale Posted January 29, 2017 Author Share Posted January 29, 2017 The VVTi doesn't have an idle control valve. Really? May have to look elsewhere then Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 29, 2017 Share Posted January 29, 2017 If it's a VVTi no, it does not have a separate ICV. As the main throttle is drive by wire it uses the motor control of the main throttle valve for idle speed as well. Usually these issues are due to wear in the dual throttle potentiometers in the throttle body. They use 2 as a fail safe. Quote Link to comment Share on other sites More sharing options...
samdale Posted January 30, 2017 Author Share Posted January 30, 2017 UPDATE: Tried the reset trick above posted by "sebas". All is well again, if anything, the car idles better than before! Is there some kind of volatile memory or some such for this system? Seems strange that it "forgot" how to idle with the battery removed for a time. Not like it drifted and needed a re-cal, just went from all good to nothing yet the battery has been disconnected before without issue. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 30, 2017 Share Posted January 30, 2017 Usually wear on the tracks of the throttle pots, it may return, it may not. If it does and it IS the pots you will need to renew them, hopefully they'll still be available. Quote Link to comment Share on other sites More sharing options...
samdale Posted January 30, 2017 Author Share Posted January 30, 2017 I'm assuming it's one of these I'd need. There's a whole vvti throttle body for sale atm but thinking £200 is a bit steep to just be keeping a spare in the shed. Maybe I'll eat my words in a few years time when my car won't idle and parts aren't available but hey. Quote Link to comment Share on other sites More sharing options...
sebas Posted January 30, 2017 Share Posted January 30, 2017 I'm glad that your supra is okay now. Apparently vvti throttle is weak and expensive that's why I'm looking forward to have Bosch throttle body fitted. Quote Link to comment Share on other sites More sharing options...
samdale Posted January 30, 2017 Author Share Posted January 30, 2017 I'm glad that your supra is okay now. Apparently vvti throttle is weak and expensive that's why I'm looking forward to have Bosch throttle body fitted. /QUOTE] maybe I SHOULD keep a spare then... Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted January 30, 2017 Share Posted January 30, 2017 maybe I SHOULD keep a spare then... /QUOTE] Buy it. Pretty sure a new vvti TB from toyota(if they still do it) is about a grand. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.