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 Ideling up and down

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lesley & John
Maxi-Scooter Rider
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PostSubject: Ideling up and down   Tue Apr 26, 2011 1:48 pm

Wonder if any other swing owners get these two issues I'm having at the moment when I first start her in the morning she will go up to 2000 revs which I believe is normal but with a bad vibration enough to make the right hand mirror vibrate but once warm the vibration gets alot better?also my idling has just started to vary slightly I like her set at 1400 I know it should be around 1300 but every now and then she will drop 100 revs then go up 100 or so revs a bit like surging I've got a new air filter standard and plugs are standard and 2000 miles on them just wondering if these symtoms are common thanks all
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MikeO
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 2:13 pm

Mine always revs higher when I start it but I rarely wait long enough to experience any other variations.

Does the Silverwing have an automatic choke? If so, that's the reason.
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Waspie
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 3:21 pm

Higher revs at first start of the day is pretty normal. As for the vibration, I too suffer that phenomenon but after the engine is warm and the revs have dropped so does the vibration. I find on my machine the mirror vibration at most speeds when riding too.

As for the 'surging' as you call it, I call it 'hunting' I have no idea. Probably something to do with the engine mapping - me wild guessing!!!!

Mike, I await to be corrected but I don't think FI engines have a choke, I thought they were for the carburatted engines!!
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MikeO
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 3:34 pm

Indeed, Doug, but I think injected engines have some sort of device for enriching the mixture on start-up................don't they?
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Waspie
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 3:35 pm

Your forcing me to open up my manual aren't you!! Laughing
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Waspie
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 3:43 pm

MikeO wrote:
Indeed, Doug, but I think injected engines have some sort of device for enriching the mixture on start-up................don't they?

OK opened the manual!

I looked, I no understandee!!

Just tons of sensors. So my guess would still be the engine mapping!!!

Out of my depth with any more!!
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BlackFly
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 3:55 pm

Cold start enrichment is done by the ECU via the mapping of the fuel injection times. You don't have (except of the sensors but they are not only used for this) any special hardware for the enrichment like on carburators.

To the idling speeds: 2000 revs should be normal with cold engine, i think i had at winter temperatures some more...

To the surging: Do you hear it or do you only see it on the tacho? I think it can also be a indication problem. Btw, the rev meter is no high precision indicator it estimates the value and 100revs more or less can be misjudging of the indicator. Therefore the question: Do you hear it?
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AAAA
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 7:34 pm

Mine does the same thing, and i hear it.They all idle up till a certain temp is achieved, allowing the o2 sensor to do the job of measuring air. The o2 sensor, in harmony with the maf sensor(if it has one?) is what determines the fuel ratio to be inserted into the cylinders. Does anyone know if the o2 sensor is a 2,3,4 wire? If its a 3 wire or over it has closed loop tuning.
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bigbird
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 10:22 pm

Tagg wrote:
Does anyone know if the o2 sensor is a 2,3,4 wire? If its a 3 wire or over it has closed loop tuning.

4 wire, definitely closed loop.
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ehaughn
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 10:43 pm

I also have the vibration as well and only have 2k miles on her.

I notice the vibration in the handle bars. If I accelerate a little while it warms up, it goes away for a splt second until the idle drops.

Also, once warm, it also goes away.

When riding on the highway, I do get some vibration on the mirrors as well.

I think it has to do with it being a twin cyclinder?

Erick
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bigbird
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 10:58 pm

No vibration on mine and my mirrors are crystal clear at all times. I'm wondering if you are feeling drive belt slap?
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ehaughn
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PostSubject: Re: Ideling up and down   Tue Apr 26, 2011 11:07 pm

Not sure, I do not hear the belt hitting the case.

No idea on how to troubleshoot this.

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bigbird
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PostSubject: Re: Ideling up and down   Wed Apr 27, 2011 12:02 am

Maybe a throttle synchronization issue?
This could be more pronounced during fast idle enrichment when open loop operation does not modify the ignition and injector pulse width with feedback from the O2 sensor.
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