Heat related.idle weirdness

General Aprilia banter
Post Reply
Message
Author
User avatar
KitchenSync
Clubman Racer
Clubman Racer
Posts: 228
Joined: Thu Apr 19, 2012 7:38 pm
Location: Leicestershire UK

Heat related.idle weirdness

#1 Post by KitchenSync » Tue Jul 16, 2019 8:38 pm

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
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

User avatar
D-Rider
Admin
Admin
Posts: 15558
Joined: Wed Jan 03, 2007 1:09 pm
Location: Coventry

#2 Post by D-Rider » Sat Jul 20, 2019 7:48 pm

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.
“Scientists investigate that which already is. Engineers create that which has never been.”
-- Albert Einstein

User avatar
KitchenSync
Clubman Racer
Clubman Racer
Posts: 228
Joined: Thu Apr 19, 2012 7:38 pm
Location: Leicestershire UK

#3 Post by KitchenSync » Mon Jul 22, 2019 1:04 pm

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.
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

User avatar
KitchenSync
Clubman Racer
Clubman Racer
Posts: 228
Joined: Thu Apr 19, 2012 7:38 pm
Location: Leicestershire UK

#4 Post by KitchenSync » Mon Jul 22, 2019 1:56 pm

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

https://www.apriliaforum.com/forums/sho ... ratic-Idle
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

Post Reply