09GSA - Start from cold, first use of throttle, engine stalls

Now that all the fun stuff is out of the way, shall we return to the original question at hand?

:D


dakarDude said:
Hi All,

I read the threads following a search with the relevant keywords on a problem that has just surfaced this week.

Here goes...

- Bike is an 09GSA (purchased last Sept.) from new
- 7,400 miles on the clock
- Bike serviced last Saturday
- Plenty of fuel in

Just this week, (this seems to occur whether the bike has been left overnight on the side or main stand), I start the bike then the moment I use the throttle for the first time, the bike stalls.

I then restart it, and although it struggles a little (sounds like it may stall again), it will be fine and off I go. This has happened for the last three days in succession.

I initially wondered if it was the FPC - but surely my 09' has had the latest "version" put on it?

Has anyone any ideas please?

Thanks.
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Engineer said:
...

Hard to diagnose, but maybe the dealer set the idle too low? maybe you bike has developed a fault with the fast idle system - if you take it back to the dealer make sure they check it when it is stone cold and not immediately you arrive with a hot engine - bit of a pain because you will have to let it cool down for a few hours first!!
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Are you referring to the idle actuator reset/sync? Or, is there something else? I'm not familiar with the "fast idle system"
 
T.REX63 said:
Are you referring to the idle actuator reset/sync? Or, is there something else? I'm not familiar with the "fast idle system"
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Fast idle is the modern replacement for the old fashioned choke - well that is my understanding.
 
Engineer said:
Fast idle is the modern replacement for the old fashioned choke - well that is my understanding.
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Yeah, you may have a point. The throttles are held open a tad by an electric servo when cold and if they (or one of them) are not you won't get the fast tickover and hence be more prone to a stall. It'd be worth noting the rpm when stone cold and comparing it with a 'good' bike to see if there's a difference, though to be honest I'm not sure what difference this makes compared to opening the throttle manually, albeit slowly.
 
RickG said:
Yeah, you may have a point. The throttles are held open a tad by an electric servo when cold and if they (or one of them) are not you won't get the fast tickover and hence be more prone to a stall. It'd be worth noting the rpm when stone cold and comparing it with a 'good' bike to see if there's a difference, though to be honest I'm not sure what difference this makes compared to opening the throttle manually, albeit slowly.
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That would be that pesky, little stepper motor, right? From what I understand, it can loose its base-line or base position and there is no feedback to the CPU noticing any change (the CPU thinks all is OK). Recycling the stepper motor to the closed-stop-position would re-establish the base line.

But, shouldn't the bike also run rough(er) when hot...?

I did a reset on my '07 (43k miles) and it run instantly smoother cold and hot.
 
T.REX63 said:
That would be that pesky, little stepper motor, right? From what I understand, it can loose its base-line or base position and there is no feedback to the CPU noticing any change (the CPU thinks all is OK). Recycling the stepper motor to the closed-stop-position would re-establish the base line.

But, shouldn't the bike also run rough(er) when hot...?

I did a reset on my '07 (43k miles) and it run instantly smoother cold and hot.
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Or does the engine management system just enrich the mixture when it is cold?
 
Yea seams a shame that fizzled out, can someone else say something provocotive and kick it off again. PS hope you get the problem sorted :thumb2
 
oh well

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Well I was going to apologise for my original piss-taking but now that Cherokee has gone all 'Water-Margin', i'm just plain scared......:augie
 
well

when i can walk on rice paper and snatch the five pebbles from your hand it will be time for me to leave Master..................:Motomartin
 
the stepper motors constantly adjust the idle speed whether hot or cold and the ECU doesn't really have to know where they are as it knows the engine speed and that's what its adjusting. Course if its trying to adjust and nothing is happening it will throw out an error which the dealer or 911 can read. Idle hot will be around 1200 and idle cold will be around 1400. Those arent accurate figures but close enough for reading an analogue rev counter. You can also test the idle circuit by putting bike in gear brake on and slowly let the clutch out. the idle will be maintained for a bit until it goes out or range. On the old carb or fixed idle systems the idle would instantly slow.

Personally I dont think thats the problem as I think it would show problems in other areas, maybe there is but the op didnt post them?. If you leave the bike for a min or two to get a bit of warmth does it still do it?
 
BruceG said:
So lets get some perspective here, and use a few scenarios to clarify.

Imagime you have plumbing problem in the house, you pay a tradesman good money to fix it, a few days later the plumbing starts to play up, do you;
A) Go log onto the internet and ask someone on a forum for advice how to fix it?
or
B) Get the plumber back to sort it!


You pay to have your central heating boiler serviced, a few days after the service your normally well operating bolier starts to play up do you ;
A) Go log on the internet and ask some one on a forum for advice how to fix it?
or
B) Get the guy who you paid back to sort it

now the real difficult one

You take your expensive motorcycle for a routine service at a highly inflated price, a few days later, your noramlly relaible running motorcycle starts to play up do you
A) Go log on the internet ans ask someone on a forum for advice on how to fix it?
or
B) take it back to the thieving scumwho took your money for the service.

NO BRAINER


Dont piss and moan when people point out your obvious stupidity, take it back and get it sorted, you paid good money demand the service!
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Who's pissing and moaning? I came on here for some friendly advice - 99% of people have been brilliant, but not you eh? Mr Fecking Angry.

I did a quick search on your posts on this forum yesterday. On page one alone, I don't think I could see one constructive reply to a single thread you have ever stuck your oar in on - all you do is snipe and stick replies in to wind people up - but I guess that's how people like you get their kicks isn't it?

If you've gone, superb. Good riddance. :clap:clap:clap:clap:clap:clap

RickG - many thanks for your post mate (and to everyone else who posted suggestions), the TPS reset appears to have cracked it.

MrK - I always wait for the pre-flight checks but cheers - its a good point to have checked. :thumb
 
Mine seems to tick over at the same rate when stone cold but when blipped they revs seem to drop quickly to about 2000rpm and then slowly to normal idle speed.

A couple of times I have thought that the throttle is sticky when I first move off.

Maybe it's this slowed reduction in revs when cold that is missing?
 
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