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Old 01-25-2013, 06:10 PM   #15604
~TABASCO~
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Joined: Jan 2008
Location: Tejas
Oddometer: 372
Graham,

May I ask, why don't you just hold the start button down one time until it starts... I notice you hit the button about ten times but it doesn't even sound as if the crank is making one revolution ?

It would seem to me that there is obviously a prime 'squirt' when someone turns the key on. I would also think that the injector pulse is probably a bit longer the first few revolutions, and probably has a "fueling sequence" as in 'pulse and duration' each time someone touches the starter button... This "sequence" is probably only initialized from something like 0-10% throttle opening.. But this "sequence" might be turned off or tricked if the throttle is held wide open.

I say this because I had a Tenere here in the shop last week that had something similar with a week battery. I held the starter down and it cranked slow, then tried again, put a charger on it for a few minutes and again. I put my nose at the rear muffler and smelled like raw fuel... After a few more minutes I held the throttle open all the way and it fired up. I did hold the button down until it started. It choked a bit and then ran rough for a few seconds... It sounded like it was kinda flooded....... It had that sound and feeling of a flooded engine.

With that being said, is it possible that these hard starting situation could be because of a semi-fuel injected flooding scenario ? If the bike gets the first prime, and then goes into its normal "starting fuel sequence" and doesn't start, the natural thing is to try again......... But that is just adding more and more fuel.....


I found out last year working with the PCV & AT that the Tenere has a cold start software package in the ECM.. It goes though a different starting / worm up procedure when cold VS when its worm... We could see this on the AT maps when I thought I was seeing something strange last winter.... There is defiantly a different fuel map "sequence" Etc in the cold VS wormer weather.. And its not just when the bike starts but runs a whole different fuel map. This is not added or aftermarket, this is stock. I'm sure its adding more fuel. But what we don't know is on start up it could be really extending the fuel duration or phasing. And also it could be resetting it self each time we hit the start button or turn the key on or off.. Try it, I bet you will smell lots of raw fuel in the muffler.


So, to recap, if its cold, and people hit the started several times I have a feeling, or my thoughts are this seems to be more of an 'over fueling' on start up sequence. It seems the only way to trick the computer is to quite possibly hold the throttle open to turn this fuel off. *** also, when you hold the throttle open you are NOT holding the butter flies open on the throttle bodies..*** These are all computer controlled by the ECM.. This is not cable operated. IMOP, This is a software issue, not a hardware problem. The old days you would be holding open the butter fly and alow in a ton of air to off set the extra fuel, more times than not it would fire up. On this bike its software and sensors, not cables and parts, per-se. We are not in control of this motor, the ECM is... Our riding experiance is a relationship with sensors and software.

These are just a few thoughts I had and wanted to throw on the table to try and help the crowd..... On my bike I touch the starter for less than one second and she has always just fired right up on a dime....





Quote:
Originally Posted by GrahamD View Post
Last hard tests...


Pretty clear how it happens, pretty clear how to clear it. Put it down to modern closed loop FI. Also note that after the ECU "thinks" the engine has fired , probably from the initial burst of engine acceleration, it turns the headlight on. If you want to save some battery life cycle the ignition again and the headlights will turn off again. No point burning 100W for no reason. It may be a part of the problem. Don't keep cranking without opening that throttle up.

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~TABASCO~ screwed with this post 01-25-2013 at 06:31 PM
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