mic Donating Members 1,725 Member For: 17y 21d Gender: Male Posted 22/03/11 08:26 AM Share Posted 22/03/11 08:26 AM mate I just checked my t/b and at idle its definately open. if u push it shut it stalls, which confirms my theory. they do not have an aac valve like a jap car or the likes, so it relies on the t/b letting air through to idle Link to comment Share on other sites More sharing options...
FastR1Red Member 360 Member For: 19y 9m 7d Gender: Male Location: Mt Waverley Posted 22/03/11 09:31 AM Share Posted 22/03/11 09:31 AM on the track none of this hinders me or helps me, I dont take my foot off the accelerator down the quarter so would have no idea if the revs hang or not I've never been down the quarter but wouldn't mind trying it one day maybe, only tracks I'm on is Winton, Sandown and Phillip Island. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 16d Gender: Male Location: Perth Posted 22/03/11 09:32 AM Share Posted 22/03/11 09:32 AM Yeah it will be, there is no idle air valve like older efi cars. the PCM uses the throttle butterfly (amongst other things) too control idle speed. The idle ghang could be caused by a tuning issue, or an air leak as the PCM can't control the extra air entering the engine, and even with the throttle fully "closed" ( which it never actually is, it is always cracked slightly) the PCM won't be able too drag the revs down low/quickly enough Link to comment Share on other sites More sharing options...
aussie1926 Donating Members 176 Member For: 14y 11m 17d Gender: Male Location: Muswellbrook NSW Posted 27/03/11 03:35 AM Share Posted 27/03/11 03:35 AM I have a xr6 ute and I had the head replaced on it, every since then mine holds the revs for ages, will be in a carpark put the clutch in and the car sits on 1500 revs for 10 or so seconds then drops to normal idle Link to comment Share on other sites More sharing options...
IH8TOADS Silver Donating Members 3,618 Member For: 19y 7m Gender: Male Location: OZ Posted 28/03/11 02:28 PM Share Posted 28/03/11 02:28 PM If you put the clutch in and out does it go away? Link to comment Share on other sites More sharing options...
Zerosignal Phantom Menace Donating Members 232 Member For: 14y 5m 30d Gender: Male Posted 28/03/11 10:20 PM Share Posted 28/03/11 10:20 PM Mine did this and it was a vacuum issue. Link to comment Share on other sites More sharing options...
aussie1926 Donating Members 176 Member For: 14y 11m 17d Gender: Male Location: Muswellbrook NSW Posted 30/03/11 11:21 AM Share Posted 30/03/11 11:21 AM if u let the clutch out the revs droped down but when u put it back in it was holding the revs, I have only noticed it since I had the head replaced Link to comment Share on other sites More sharing options...
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