help! RS doesnt idle or start from cold
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Thread: help! RS doesnt idle or start from cold

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    Senior Member
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    help! RS doesnt idle or start from cold

    Does this 90% of the time, sure the cold weather is making it worse. What can do???

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    King of the Group-Buys Laurencewhite's Avatar
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    Could be the stepper motor. Might be worth a strip down and clean and then reset the TPS.
    Laurence

    Benelli Tornado 900 LE No. 49
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    Quote Originally Posted by Peter.G View Post
    Does this 90% of the time, sure the cold weather is making it worse. What can do???
    Can you explain it a bit more ?
    Do you mean it doesn't start first time when cold?
    You have to keep the throttle cracked to get it started?
    It doesn't idle at start, and you have to keep the throttle open, or it idles fine when warm ?

    Are you using it regularly, or starting it every sunday(etc) to run it ?

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    Ok here we go. Bike hasn't been used for 3 months, while having service, upgrades and exhaust. Last time I used it was in Nov at donington, when it was a bitch to start from cold and intermittently wouldn't tick but ran fine on track. Starting from cold today it would fire straight away but only while starter is held staying at
    Say 300rpm. If I blip throttle and release starter revs increase but stall soon as throttle released. Did this 5 times even after intial warm up. Ride to work was horrible, every traffic light and gear change it stalled. I had to hold revs up on throttle. A few times it did idle fine. Ride home started well (8hours later,cold engine) fired on starter for 5 secs then burst up to idle speed. Only stalled once on way home, then rode to mates and started playing up again. My conclusion is stepper motor is not operating intermittently, some times hot sometimes cold. The question is why?? I love the bike, please help me sort this annoying fault

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    King of the Group-Buys Laurencewhite's Avatar
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    The stepper can get gummed up which prevents it from operating correctly. Best to remove it and open it up to make sure the plunger is not sticking. Then reset the TPS.
    Laurence

    Benelli Tornado 900 LE No. 49
    Benelli 1130 TNT Titainium
    Benelli 1130 TRE-K
    Benelli 750 SEI
    Benelli 250 2c
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  7. #6
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    Quote Originally Posted by Laurencewhite View Post
    The stepper can get gummed up which prevents it from operating correctly. Best to remove it and open it up to make sure the plunger is not sticking. Then reset the TPS.
    Cheers Laurence, will have look tomorrow. How do I set tps? Read ohms shut? What reading am I looking for?

  8. #7
    King of the Group-Buys Laurencewhite's Avatar
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    You need to have TuneECU loaded onto your laptop and a special cable to connect it to the bike. There is an option in TuneECU to reset the TPS.
    Laurence

    Benelli Tornado 900 LE No. 49
    Benelli 1130 TNT Titainium
    Benelli 1130 TRE-K
    Benelli 750 SEI
    Benelli 250 2c
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    Senior Member klinkerstinker's Avatar
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    Sound like you simply need a new tank of fuel. Try that first. Give it a good long run 40 mile round trip if not further, and get rid of that fuel.

    This is the trouble if these bikes are left for months. I use mine at least once every two weeks if not more.



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    Senior Member Bronxhulk's Avatar
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    Quote Originally Posted by klinkerstinker View Post

    Sound like you simply need a new tank of fuel. Try that first. Give it a good long run 40 mile round trip if not further, and get rid of that fuel.

    This is the trouble if these bikes are left for months. I use mine at least once every two weeks if not more.

    Not if he used it in November. The fuel should still be fine. I think Lawerence is correct on this one. Where you use the bike constantly you keep the stepper motor from gumming up. I think that's all it is.

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    Quote Originally Posted by Bronxhulk View Post
    Not if he used it in November. The fuel should still be fine.

    Depends on where he got his fuel and how he has stored his bike for 2 months.

    Back fro service, they may not have connected your idle valve....it should give you a FI light in such a case, but it's worth checking anyway.

    They also may have left you with an air leak if they took off your airbox etc.

    I would be of the opinion that the more "knowns" in troubleshooting the better. Swap the fuel, and charge the battery. Use a starter pack if you can.

    After that,the first thing I would do if no difference, is wind both throttle cables out until loose as a donkeys ear.
    Then take all the slack out of the "open" cable until you start opening the butterflies a bit. Try start, open more, try start etc etc...

    What that will tell you is if the bike will start/run better with more air.
    Its more exact than trying to hold your throttle open with your hand and involves the least amount of dis-assembly initially.

    If your idle valve sticks open, your bike will just run to max rpm.
    If it sticks closed, the only way to start the bike will be with more throttle opening.


    If this makes no difference, you are into further disassembly and investigation

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