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Heat related.idle weirdness

 
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KitchenSync
Clubman Racer
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Joined: 19 Apr 2012
Posts: 228
Location: Leicestershire UK

PostPosted: Tue Jul 16, 2019 8:38 pm    Post subject: Heat related.idle weirdness Reply with quote

In neutral, after the 30 min ride home and stuck in city traffic the idle gradually edges up to 3,000 as things get warmer and warmer. If I press the gear change down enough for the neutral light to out, the idling drops to it's normal 1,250ish, but eventually after lots of sitting in traffic and the fans coming on, even that normal idle starts to rise to 2,000+.

This couple of snapshots from TuneECU show with and without the neutral light out. Clearly the idle.control valve and fuelling are being triggered by 'something' to react.

When cold everything behaves normally, although I can still trigger a drop in idle speed by putting the bike in gear or half-pressing the gear lever so the light goes out.

Is very very consistent in its behaviour and I'm baffled - it makes slow traffic a nightmare.

The only thing I can see is the ambient air temperature is off the charts so I'll try pulling the wires off to see if it stabilises.

Any other ideas?



https://photos.app.goo.gl/JtQZHWgJvMxGdTeW9
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2002 Signor Falco - stolen in Nottingham, ringed and alive again down south under an assumed identity
2002 Futura - King Fut
2011 Skyteam Bongo 125 - reimagined as Daryl's ride from The Walking Dead
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D-Rider
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Joined: 03 Jan 2007
Posts: 15534
Location: Coventry

PostPosted: Sat Jul 20, 2019 7:48 pm    Post subject: Reply with quote

Sorry - although I've had my Futura for a couple of years now, I haven't really got round to fiddling with it yet so I'm not much help.
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KitchenSync
Clubman Racer
Clubman Racer


Joined: 19 Apr 2012
Posts: 228
Location: Leicestershire UK

PostPosted: Mon Jul 22, 2019 1:04 pm    Post subject: Reply with quote

It's a "feature" I've seen written about elsewhere, but the other way round - neutral light dropping revs. Could there be a bug in the software? I guess the only way out is to have it mapped at a cost no less than half the value of the bike.

I've not pulled the air temp thermistor yet - figured if I can take a resistance reading at normal temperature and just jab a resistor of similar value the ECU won't awaken from it's slumber and go all "eh... what... there's something wrong...". Although a quick search will doubtless find it only costs £2.21 when fitted to a Citroen but £835.31 when supplied in an Aprilia bag.
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2002 Signor Falco - stolen in Nottingham, ringed and alive again down south under an assumed identity
2002 Futura - King Fut
2011 Skyteam Bongo 125 - reimagined as Daryl's ride from The Walking Dead
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KitchenSync
Clubman Racer
Clubman Racer


Joined: 19 Apr 2012
Posts: 228
Location: Leicestershire UK

PostPosted: Mon Jul 22, 2019 1:56 pm    Post subject: Reply with quote

Found a long thread on Futura wiring problems that could be the root of many quirks...

https://www.apriliaforum.com/forums/showthread.php?51774-Erratic-Idle
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2002 Signor Falco - stolen in Nottingham, ringed and alive again down south under an assumed identity
2002 Futura - King Fut
2011 Skyteam Bongo 125 - reimagined as Daryl's ride from The Walking Dead
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