Re: [St] St Digest, Re; flake out problem.

[whe44edw@xxxxxxx]

Steve and company, I have just fixed this problem on my 02 ST. It is 
caused by low system voltage.
Check your battery terminals for tightness, this will cause this. Also 
if your charging system is not up to snuff, low voltage will occur, 
voltage at the battery with the engine stopped and headlight fuse 
pulled should be 12.7v MINIUM.
With the fuse in and the bike rulling at 400rpm or so should be 
13.3volts MINIUM.
I had the three alternator AC wires short together( on rhe right side 
where they are tiewrapped to the frame before going to the regulator) 
over a period of 3to4 months earlier this year. Ihad to replace the 
wiresas they were burned.
(use 16ga wire). My alternator was ok and so was the regulator.

Good luck, Bill Edwards Simi Valley ca. whe44edw@xxxxxxx


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Sent: Thu, 27 Sep 2007 1:52 pm
Subject: St Digest, Vol 30, Issue 27



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Today's Topics:

1. New little flakeout (Steven Kohlscheen)
2. Re: New little flakeout (BrettWilson21@xxxxxxx)
3. Re: New little flakeout (Matt Knowles)
4. Re: New little flakeout (Matt Knowles)
5. Re: New little flakeout (Patti Beadles)
6. Re: New little flakeout (Matt Knowles)
7. Re: New little flakeout (JES_VFR)


----------------------------------------------------------------------

Message: 1
Date: Wed, 26 Sep 2007 16:53:47 -0500
From: Steven Kohlscheen <trumpst@xxxxxxxxxxx>
Subject: [St] New little flakeout
To: <st@xxxxxxxxxxxxxxxxxxxx>
Message-ID: <BAY109-W20D73EA3CB8CC17964E5F8A6B00@xxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"


OK, I got a new little wrinkle to run by the list. Basically when the 
cooling
fan kicks in, the fuel gauge goes to empty. Once it reaches empty the 
MIL light
comes on. Once the fan goes out, the gauge recovers. I had it do this 
too me
in stop and go traffic a few weeks ago, and figured it was just 
overheating the
connection to the sender unit, it opens up, causes the loss, but when I 
get
moving and everything cools off, the circuit closes back up. And I did 
find the
dealer mechanic who last worked on it didn't fully seat the connector. 
But it
did it sitting still just last week, after I fixed the connector. Fan 
kicks in,
gauge goes down, fan turns off, gauge recovers. I let the bike run long 
enough
to go through this cycle twice. Verifying the correlation. Of course, 
the MIL
light stays on until the 3 heat cycles, ugh. I haven't had a chance to 
run by
the dealer to get the actual code, but I'm betting it's something about 
bad
reading from the fuel gauge sender. Anyone heard of this before? 
Suspect the
fan is pulling too much juice maybe? The engine will have a millisecond 
of
stumble when the fan kicks on, but it's had that for some time now. 
Anyone?

Steven "Dirty Dawg" Kohlscheen
2002 Triumph Sprint ST
2001 Yamaha YZ426f
_________________________________________________________________
Discover the new Windows Vista
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------------------------------

Message: 2
Date: Wed, 26 Sep 2007 18:50:14 EDT
From: BrettWilson21@xxxxxxx
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <c98.1c7fdac7.342c3c26@xxxxxxx>
Content-Type: text/plain; charset="US-ASCII"

The 99-04 ST series had faulty fuel sender units.

The early ones would leak fuel, permanently staining the frame, usually 
on
the right side. They were replaced under a recall. The replacement unit 
on my 99

ST was faulty also. It didnt leak fuel but it would go from full to 
empty of
its own accord.

I would start there.

HTH

Brett.


------------------------------

Message: 3
Date: Wed, 26 Sep 2007 17:32:59 -0700
From: Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <1F2D9D8F-60AC-4ECA-9BA6-29D3784F73AC@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

When my temperature sending unit went bad all kinds of weird things
started happening. One was that the fuel gauge did what yours is
doing. But it also caused the engine to run real rich and rough.

When you say the mechanic didn't fully seat the connector, is that
because the sender was just replaced or was he doing other work?

On Sep 26, 2007, at 2:53 PM, Steven Kohlscheen wrote:

>
> OK, I got a new little wrinkle to run by the list. Basically when
> the cooling fan kicks in, the fuel gauge goes to empty. Once it
> reaches empty the MIL light comes on. Once the fan goes out, the
> gauge recovers. I had it do this too me in stop and go traffic a
> few weeks ago, and figured it was just overheating the connection
> to the sender unit, it opens up, causes the loss, but when I get
> moving and everything cools off, the circuit closes back up. And I
> did find the dealer mechanic who last worked on it didn't fully
> seat the connector. But it did it sitting still just last week,
> after I fixed the connector. Fan kicks in, gauge goes down, fan
> turns off, gauge recovers. I let the bike run long enough to go
> through this cycle twice. Verifying the correlation. Of course,
> the MIL light stays on until the 3 heat cycles, ugh. I haven't had
> a chance to run by the dealer to get the actual code, but I'm
> betting it's something about bad reading from the fuel gauge
> sender. Anyone heard of this before? Suspect the fan is pulling
> too much juice maybe? The engine will have a millisecond of
> stumble when the fan kicks on, but it's had that for some time
> now. Anyone?
>
> Steven "Dirty Dawg" Kohlscheen
> 2002 Triumph Sprint ST
> 2001 Yamaha YZ426f
> _________________________________________________________________
> Discover the new Windows Vista
> http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE
> _______________________________________________
> Triumph Sprint ST/RS mailing list
> Send list posts to ST@xxxxxxxxxxxxxx
> Change your list options at www.Triumphnet.com
>

Matt Knowles - Ferndale, CA - http://www.knowlesville.com/matt/
motorcycles
'99 Sprint ST - for going fast and far (2CZUSA)
'01 KLR650 (A15) - for exploring the North Coast backroads
'97 KLX300 & '01 Lakota - for playing in the dirt
'79 KZ400 - just because it was the first vehicle I ever owned



------------------------------

Message: 4
Date: Wed, 26 Sep 2007 17:36:20 -0700
From: Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <69CF2F52-4B29-4674-A347-BF6A3A7E98A8@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed


On Sep 26, 2007, at 3:50 PM, BrettWilson21@xxxxxxx wrote:

> The 99-04 ST series had faulty fuel sender units.

I'm pretty sure it was really only the early '99s that had the
problem. By the next model year they had it fixed.

I probably still hold the record for number of fuel senders replaced,
at 4.

Matt Knowles - Ferndale, CA - http://www.knowlesville.com/matt/
motorcycles
'99 Sprint ST - for going fast and far (2CZUSA)
'01 KLR650 (A15) - for exploring the North Coast backroads
'97 KLX300 & '01 Lakota - for playing in the dirt
'79 KZ400 - just because it was the first vehicle I ever owned



------------------------------

Message: 5
Date: Wed, 26 Sep 2007 17:44:14 -0700
From: "Patti Beadles" <pattib@xxxxxxxxxx>
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <20070927004414.88FFEBE8C0@xxxxxxxxxxxxxxx>

>I'm pretty sure it was really only the early '99s that had the
>problem. By the next model year they had it fixed.

Nope. My first Sprint was a 2000, and it had a faulty fuel
sender. The bike was eventually replaced under warranty by
a 2001, and the problem had been fixed by then.

-Patti


------------------------------

Message: 6
Date: Wed, 26 Sep 2007 17:50:27 -0700
From: Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <680B0E5C-DB41-44EE-8E19-CC91710D008A@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

I guess that problem did stretch on longer than I remembered. These
days I have trouble remembering what happened yesterday. I can't wait
to find out what it's like when I really get old.

On Sep 26, 2007, at 5:44 PM, Patti Beadles wrote:

>> I'm pretty sure it was really only the early '99s that had the
>> problem. By the next model year they had it fixed.
>
> Nope. My first Sprint was a 2000, and it had a faulty fuel
> sender. The bike was eventually replaced under warranty by
> a 2001, and the problem had been fixed by then.
>
> -Patti

Matt Knowles
Aesthetic Design & Photography - www.aestheticdesign.com - (707)
786-4643




------------------------------

Message: 7
Date: Wed, 26 Sep 2007 21:28:50 -0400
From: JES_VFR <jes_vfr@xxxxxxxxxxx>
Subject: Re: [St] New little flakeout
To: ST@xxxxxxxxxxxxxx
Message-ID: <7.0.1.0.2.20070926212446.027c1078@xxxxxxxxxxx>
Content-Type: text/plain; charset=us-ascii; format=flowed;
x-avg-checked=avg-ok-73A4835

At 05:53 PM 9/26/2007, you wrote:


>OK, I got a new little wrinkle to run by the list. Basically when
>the cooling fan kicks in, the fuel gauge goes to empty. Once it
>reaches empty the MIL light comes on. Once the fan goes out, the
>gauge recovers. I had it do this too me in stop and go traffic a
>few weeks ago, and figured it was just overheating the connection to
>the sender unit, it opens up, causes the loss, but when I get moving
>and everything cools off, the circuit closes back up. And I did
>find the dealer mechanic who last worked on it didn't fully seat the
>connector. But it did it sitting still just last week, after I
>fixed the connector. Fan kicks in, gauge goes down, fan turns off,
>gauge recovers. I let the bike run long enough to go through this
>cycle twice. Verifying the correlation. Of course, the MIL light
>stays on until the 3 heat cycles, ugh. I haven't had a chance to
>run by the dealer to get the actual code, but I'm betting it's
>something about bad reading from the fuel gauge sender. Anyone
> heard of this before? Suspect the fan is pulling too much juice
> maybe? The engine will have a millisecond of stumble when the fan
> kicks on, but it's had that for some time now. Anyone?
>
>Steven "Dirty Dawg" Kohlscheen
>2002 Triumph Sprint ST
>2001 Yamaha YZ426f
well if the coolant temp sender is a thermistor like the on my honda
and all my cages, it could be shorting out when it hits the temp that
should switch on the fan.
That would make sense because its pulling the voltage on the supply
bus that feeds all the sensors of the ecu and the fuel sender.
Low signals from all the other sensors help trip the MIL light, yet
the short still triggers the fans.
or at least that is my immediate take on it.

Check the temp sender, or get it checked.


JohnS
A Dragon Ascending
"Forging my body in the Fires of my Will"



------------------------------

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