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24-09-2006, 11:22 AM
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Cane Farmer
Join Date: Jun 2006
Location: Tom Price, WA
Posts: 4,056
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G'day, Posting this up for my old man.
He has a 98 model AU Falcon Forte with a 5.0L. It has a big idle problem, but it comes every now and then. Gradually worsening until it has to go to a workshop. the rpm can greatly vary at a stand still up until the point where the car runs unbelievably rough, then it goes back to normal. So for $3000 has been spent this month to avail, includes new coild packs, new leads, plugs, injectors have been twice in 3 weeks, car has been serviced and dyno tuned. Then hooked up to a comp which shows no faults. Any ideas, had one suggestion that it could be the idler step down. The old man says: 'it's breaking my balls.'
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1994 ED XR6T - Cobalt Blue. 2009 FG XR6 - Black. Quote:
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24-09-2006, 04:41 PM
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Miami Pilot
 
Join Date: Jan 2005
Location: ACT
Posts: 21,704
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It could be a vacuum leak around the inlet manifold - spray around with mild soapy water while car is running - you should be able to see if there is a leak somewhere. It could also be the Idle speed control valve. This is attached to the throttle body and should be cleaned every 12 months or so - if it's never been cleaned, it may be sticking. Same for the MAF element - if it's dirty, it will cause the car to run funny, but not only at idle.
I'd bet on the ISC valve, personally.
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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25-09-2006, 07:24 AM
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Cane Farmer
Join Date: Jun 2006
Location: Tom Price, WA
Posts: 4,056
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What exactly is the ISC valve?
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1994 ED XR6T - Cobalt Blue. 2009 FG XR6 - Black. Quote:
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25-09-2006, 10:23 AM
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With da Warlords
Join Date: May 2006
Location: Orange NSW
Posts: 1,781
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Idle Speed Control - Where the red arrow is pointing
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You don't have to be faster than the bear, you just have to be faster than the slowest guy running from the bear. For Sale: Parachute. Only used once, never opened, small stain. Windsor Warlords AU III XR-8220  300+ rwhp of Manual fun XR50T Ute - 300rwkw (give or take depending on the day)
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25-09-2006, 11:34 AM
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XD197
Join Date: Sep 2006
Location: Riverton, WA
Posts: 498
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Hey man the isc on an au 5.o is the thing on the side of the throtle body with a plug which u undo and two bolts, eight mm socket.Just be careful when u take it off not to break the gasket.Use carby cleaner and a small paintbrush to clean inside the isc, keep scrubbin till its spotless. That should help
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Urgent Help Needed AU Rough Idle
Linear Mode
