Re: [ST] '00 RS Running Rough - Resolved

[Kevin Kimick <kkimick@xxxxxxxxxxxxxxxxxxx>]

I can't find any coolant temp sensor in my service manual for 2002-2004 
Sprint ST/RS.

Kevin

Don Cummings wrote:
>  Just wanted to share my experience.  After a new tune and CO reset, my
> bike had stopped stalling, but was still running a bit rough, stumbling
> at constant/light throttle.
>
> Turned out the coolant temp sensor was bad.  My guess is it was reading
> cold all the time, making the engine run rich, which was why at wide
> open throttle, the bike went great, but when hot, at constant light
> throttle, it was loading up on fuel and causing a bit of
> popping/stuttering.
>
> Now the bike runs great!
>
> BTW, there was no code stored for the faulty sensor.
>
> Don
>
>
> ______________________________
> Don Cummings
> Vice President
> ZyMac, Inc.
> www.zymac.com
> W:  (603) 537-0400 x.103
> M:  (603) 759-7361
>  
>
> -----Original Message-----
> From: Jonathan West [mailto:triumphnutter@xxxxxxxxx] 
> Sent: Tuesday, August 22, 2006 8:44 PM
> To: st@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [ST] st Digest, Vol 17, Issue 34
>
> Hi Don,
> Go back to the dealer and have them do 3 things if they haven't already.
> 1)Reset the IAC valve.
> 2)Reset the closed throttle position.
> 3)Set the CO (not the CO2) to 3%-4%.
> They should have done all this if they updated your tune, but a lot of
> them don't.  Great Bay has an excellent reputation, but just make sure
> they did all that.  All these things must be done with the Game Boy and
> a gas analyzer.  If they don't have a gas analyzer, find another dealer
> that does.  
>
> If it still does it, check the 3 corrugated vacuum lines that are
> attached to the IAC valve (otherwises known as the stepper motor) for
> leaks.  They were notorious for cracking.  
>
> Good Luck,
> Jonathan West
> 95 Trophy 4
> 96 Super III
> 97 Trophy 900
> 99 ST
> 01 Daytona 955i
> 03 Speed 4
>
> From: "Don Cummings" <dcummings@xxxxxxxxx>
> Subject: [ST] '00 Sprint RS running rough, service issues
>
>
> Hey Everyone,
>
> My Sprint RS started to run rough, occasional stalling when idling and
> seemed to be "lurching" a bit when at slow role on of throttle or at
> constant throttle.....like the engine wanted to go, but then would pull
> back and go again.
>
> I brought it to Great Bay in Hampton.  I told them what was going on.
> All they ended up doing was a CO2 check and downloaded a new tune.
>
> The stalling is gone, but it starts hard when cold and still
> "burbles/stumbles" when in traffic accelerating moderately or at
> constant throttle, especially noticeable in first or second gear.
>
> I also seem to notice a fuel smell, which makes me wonder if the bike is
> running rich.  Almost as if the choke is stuck open on a carbureted
> bike.
>
> So I'm bringing it back in today.  The bike has new plugs and had a full
> service/valves done 5k miles ago. I've also run several bottles of
> Techron through and cleaned the throttle body.
>
> My guess is that either ignition timing is off, or some kind of sensor
> is out of calibration/going bad, possibly making the bike run rich.  In
> cars with mass air flow sensors, I've seen them go bad without throwing
> an engine code while giving the car symptoms as if the fuel pump were
> going bad.
>
> Any suggestions on what I should make sure Great Bay does?
>
> Thanks,
> Don
>
>
>
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