The place to "speak geek"
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Alex 111s
- Posts: 489
- Joined: Thu Dec 20, 2007 1:45 pm
- Location: Malongo, Cabinda Province - Oyne - Buckie
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by Alex 111s » Mon Feb 04, 2008 2:11 pm
Before you start - It's not Simon Cowell's new reality TV show.
My VVC has developed an eratic idle when the engine is up to temperature. on coming to a halt, the revs drop until it almost dies but then ECU applies a blip of revs to keep it going. the car idles fine when it's cold. is the throttle potentiometer on its last legs or would there be a simple solution like adjusting the idling speed?
Alex
Gone 
111s In Magnetic Blue - Hofmann's Nitrons, Larini C.Sport, Huricane Induction, EBC Ultimax/Yellow Stuff, TD Pro-Race Wheels.
Range Rover Sport Autobiography
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steve_weegie
- Posts: 3249
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- Location: Nessieland
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by steve_weegie » Mon Feb 04, 2008 2:16 pm
Idle speed should be controlled by the ecu via an air bypass (IAC) valve, so its not easily settable.
My guess would be a clogged air filter or a clogged air bypass valve. Air filter's easier to check first than the iac valve.
Cheers,
Steve
Arriving broadside, in a cloud of smoke......
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Shug
- Posts: 13835
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- Location: Deepest, Darkest Ayrshire
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by Shug » Mon Feb 04, 2008 3:00 pm
IACV almost definately. Grab a workshop manual from someone for location (on the plenum) torx screws to undo - pull it out and hose it in brake/switch cleaner and wipe off the crud.
2010 Honda VFR1200F
1990 Honda VFR400 NC30
2000 Honda VTR1000 SP1
2000 Kawasaki ZX-7R
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Rich H
- Posts: 9314
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- Location: Preston
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by Rich H » Mon Feb 04, 2008 4:13 pm
Can you do the ecu reset on the VVC? Ign on, throttle 5+ times to floor and back power off. Runs like a POS for a bit then sorts itself out. Works on N/A K's
1994 Lotus Esprit S4 - Work in progress
1980 Porsche 924 Turbo - Funky Interior Spec
2004 Smart Roadster Coupe - Hers
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Alex 111s
- Posts: 489
- Joined: Thu Dec 20, 2007 1:45 pm
- Location: Malongo, Cabinda Province - Oyne - Buckie
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by Alex 111s » Tue Feb 05, 2008 8:43 am
Thanks Guys, i'll give both a go.
Alex
Gone 111s In Magnetic Blue - Hofmann's Nitrons, Larini C.Sport, Huricane Induction, EBC Ultimax/Yellow Stuff, TD Pro-Race Wheels.
Range Rover Sport Autobiography
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Alex 111s
- Posts: 489
- Joined: Thu Dec 20, 2007 1:45 pm
- Location: Malongo, Cabinda Province - Oyne - Buckie
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by Alex 111s » Tue Feb 19, 2008 11:18 am
Full marks to Steve & Shug. cleaned out the IACV at the weekend and now things are a lot smoother and the car is a lot more drivable around town/parking/etc.
Alex
Gone 111s In Magnetic Blue - Hofmann's Nitrons, Larini C.Sport, Huricane Induction, EBC Ultimax/Yellow Stuff, TD Pro-Race Wheels.
Range Rover Sport Autobiography
