Supra ST Myster Posted December 17, 2007 Share Posted December 17, 2007 Last couple of weeks noticed the idle has dropped to 600rpm and the lights on the dash are dim plus the car sometimes tries to stall but doesnt (autobox), but when you rev it a little you can see the lights brighten up, measured the voltage when engine running and its 12.99 which isnt right but when i blip the throttle it goes to 14.2V which it should be then drops again to 12.99, so is the alternator causing the low revs or is it something else as the voltage is right if the revs are around 900-1000 Link to comment Share on other sites More sharing options...
gaz1 Posted December 17, 2007 Share Posted December 17, 2007 have you tried adjusting the idle with the throttle cable Link to comment Share on other sites More sharing options...
Supra ST Myster Posted December 17, 2007 Author Share Posted December 17, 2007 have you tried adjusting the idle with the throttle cable no, didnt want to do that as it hasnt changed position so something must be casuing it to be low? Link to comment Share on other sites More sharing options...
gaz1 Posted December 17, 2007 Share Posted December 17, 2007 no, didnt want to do that as it hasnt changed position so something must be casuing it to be low? fair enough, but your sure it just has,nt worked loose a bit before this started Link to comment Share on other sites More sharing options...
gaz1 Posted December 17, 2007 Share Posted December 17, 2007 you have not left the aircon on have you:D Link to comment Share on other sites More sharing options...
Supra ST Myster Posted December 18, 2007 Author Share Posted December 18, 2007 no not left the aircon on anyone with some decent suggestions?? Link to comment Share on other sites More sharing options...
DamanC Posted December 18, 2007 Share Posted December 18, 2007 Gaz I cant help but ill echo your thought on the throttle cable, its good practice to sort the problem rather than hide it Link to comment Share on other sites More sharing options...
imi-7 Posted December 18, 2007 Share Posted December 18, 2007 I have the same issue. How do you adjust the idle throttle cable? P.S Sorry for the thread Hijack ! Link to comment Share on other sites More sharing options...
Lukeyboy2k Posted December 18, 2007 Share Posted December 18, 2007 I had the same issue on one occasion last April - it seemed to go away after driving for half an hour or so (idle was ~400rpm). Coincidentally, the issue re-occurred for the first time this very morning - I'll see how it is on the drive home. In recent mornings I've let the car hunt on idle for a few minutes before driving off (de-misting, de-icing windows etc.) and all has been fine. Today I drove off straight away - would this make any difference? Link to comment Share on other sites More sharing options...
Guest Marcus1 Posted December 18, 2007 Share Posted December 18, 2007 idle air controll valve (iav) clean this and your problem with hunting solved also clean throtle body. carbon build up on these components causes idle probs Link to comment Share on other sites More sharing options...
bodilx6 Posted December 18, 2007 Share Posted December 18, 2007 idle air controll valve (iav) clean this and your problem with hunting solved also clean throtle body. carbon build up on these components causes idle probs Sounds as the right solution as I've had this prob for a while. Where is the IAV placed and how would you go about cleaning it as well as the throttle body? Whats the idle supposed to be (without the aircon on)? Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 18, 2007 Share Posted December 18, 2007 It either needs a new battery and / or alternator, or the charging and battery wiring looking at? The ecu can't compensate enough for such a low voltage and the dwell time on the injectors is dropping off? Link to comment Share on other sites More sharing options...
SKI Posted December 18, 2007 Share Posted December 18, 2007 I get this too, there is no pattern I can identify, doesn't seem dependant on weather, the only common factor is that it disappears after about 10 minutes of driving and (as previously stated) can be corrected by applying the throttle. I’d be interested to hear if anyone solves this one way or another! Link to comment Share on other sites More sharing options...
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