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19-04-2009, 01:09 PM
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#1 | ||
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CANT !!!!!!!!
Join Date: Jan 2009
Posts: 289
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My AU recently backfired on gas, now it wont idle on gas and idles really high on petrol, am looking for a cause, ANYONE ?
CHEERS CHRIS
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-BA XR8 Ute- Better to be late, than VERY LATE !!!!  : YEAH HA !!!!!!!! 
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19-04-2009, 01:30 PM
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CANT !!!!!!!!
Join Date: Jan 2009
Posts: 289
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Have had a good look under the bonnet, cant see any vacuum hoses off or loose, have cleaned the throtle body also.
Its like the automatic choke is stuck on, but I dont have a clue about how the choke on these things work! Any help would be appreciated. Cheers
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-BA XR8 Ute- Better to be late, than VERY LATE !!!! : YEAH HA !!!!!!!!
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19-04-2009, 01:46 PM
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#3 | ||
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FF.Com.Au Hardcore
Join Date: Sep 2006
Posts: 2,981
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check your accelrator cable, it can pop out of its housing a bit which results in high idle. check manifold bolts, make sure they are tight.
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19-04-2009, 01:50 PM
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#4 | ||
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CANT !!!!!!!!
Join Date: Jan 2009
Posts: 289
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Have been right over it, checked all vac hoses, intake hoses, manifold bolts and gaskets, have even disconnected the Battery hoping to reset the computor!
Still runs the same!
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-BA XR8 Ute- Better to be late, than VERY LATE !!!! : YEAH HA !!!!!!!!
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19-04-2009, 02:32 PM
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#5 | ||
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CANT !!!!!!!!
Join Date: Jan 2009
Posts: 289
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Anyone ?
Need the car tomorrow
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-BA XR8 Ute- Better to be late, than VERY LATE !!!! : YEAH HA !!!!!!!!
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19-04-2009, 02:33 PM
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#6 | ||
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Miami Pilot
 
Join Date: Jan 2005
Location: ACT
Posts: 21,703
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What about PCV valve? Or the MAP sensor. It sounds like a vacuum leak to me, and they're the two I'd check first.
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19-04-2009, 08:15 PM
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#7 | ||
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Now Fordless
Join Date: Aug 2005
Location: Fremantle, WA
Posts: 3,611
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If the throttle body is fully closed when its idling then it must have some sort of air leak.
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21-04-2009, 12:10 PM
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#8 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Melbourne, Victoria
Posts: 2,434
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Maybe check the ISC. I have a feeling, mine's being a bit faulty, on me. Gives rather high RPM at times.
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AUIII Falcon Forte, with SIX Appeal |
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21-04-2009, 12:28 PM
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#9 | ||
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SKID IT
Join Date: Jan 2009
Location: south burnett
Posts: 835
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i would say pvc
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Style, Create Your Own
BF XR6T Ute - 422rwhp tuned by FPT Toowoomba Where the boost junkies hang out -Forced Ford Forums |
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21-04-2009, 01:46 PM
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#10 | ||
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Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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where is the PVC valve ?
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21-04-2009, 01:50 PM
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#11 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Melbourne, Victoria
Posts: 2,434
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I think he means PCV like JC said, it's on top of your rocker cover, towards the front. Make sure it's not loose there.
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AUIII Falcon Forte, with SIX Appeal |
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21-04-2009, 01:56 PM
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#12 | ||
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they call me Tibbo
Join Date: Dec 2004
Location: Brisbane
Posts: 6,163
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disconnect the ISC and see if that has any affect on the idle
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22-04-2009, 09:17 AM
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#13 | ||
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Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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Thanks LG, now where and what is the ISC ?
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22-04-2009, 03:36 PM
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#14 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Melbourne, Victoria
Posts: 2,434
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ISC is your idle speed controller. It adjusts your idle between low and high, depending on temperatures, etc. Sometimes it gets stuck open, leaving the idle on high. So if you disconnect it, you should just have the one idle level. Most people just have their's disconnected all the time.
ISC is bolted on top of the throttle body. It has a 1-2" cylinder on it, with a black knob. On there, you will see a plug connected to it at the back of it (closest to the windscreen). Un plug it, and see if your idle comes down. If it still goes up high, you have a vacuum leak. If not, then take off that piece, and give it a clean out with some Throttle Body cleaner.
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AUIII Falcon Forte, with SIX Appeal |
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15-05-2013, 10:48 AM
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Starter Motor
Join Date: May 2013
Location: Melbourne
Posts: 1
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Just want to say thanks to all involved in this thread! My AU 5litre recently started stalling when cold, and when hot it would idle at about 1500RPM. Thanks to this thread, I disconnect the ISC and it went down to about 600-700RPM when hot, but still stalled cold. This morning I replaced the ISC and its as good as new! ALL FIXED!
Thanks so much for the info! For those who will follow in my footsteps, here's a pic of the ISC unit in place on a 5Ltr 
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AU XLS Ute - 5 Litre 5 Speed - Exactly how Utes were meant to be! Last edited by Haboota; 15-05-2013 at 11:14 AM. Reason: Added Picture |
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AU high idle ???? CAUSES ?????
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