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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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 Posted: Wed Sep 27, 2023 8:09 pm Post subject: Coolant temp sensor light re wire. |
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Hi everyone! So I’ll try to keep this long story short with you all. I have a modified 94’ k1100rs that’s been running super rich for a while. After troubleshooting for quite some time now, I stumbled across a post saying that the coolant temp sensor light needs to be connected, and functioning, as it goes to the motronic and affects the fueling to save the engine if it’s overheating. Well I don’t have the original cluster anymore so I was hoping I could just wire in a little bulb to complete the circuit. Looking at the wiring diagram, it names the color of one of the wires, but not the other (that I could find anyway. After staring at it a while)… does anyone happen to know what the color of the wire is that completes the circuit? Any assistance is MUCH appreciated. Thanks guys.
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Jrb98
Joined: 27 Sep 2023
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
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Location: Bumf***, WA
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| Posted: Thu Sep 28, 2023 5:01 pm Post subject: |
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Green wire which is switched power to the instrument cluster.
The Motronic grounds the coolant temp warning bulb to illuminate it.
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Jrb98
Joined: 27 Sep 2023
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Location: Michigan
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| Posted: Fri Sep 29, 2023 11:44 am Post subject: |
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| Flying Duck wrote: | Green wire which is switched power to the instrument cluster.
The Motronic grounds the coolant temp warning bulb to illuminate it. |
Awesome! Thank you!
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Jrb98
Joined: 27 Sep 2023
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Location: Michigan
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| Posted: Fri Sep 29, 2023 1:04 pm Post subject: |
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Do you happen to know what bulb would work, or if it matters what kind is used? I’m seeing that the cluster uses 12V 4W and 12V 3W bulbs but doesn’t specify where they go.
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
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| Posted: Fri Sep 29, 2023 9:59 pm Post subject: |
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The stock warning bulbs are 3W. The 4W bulbs are for the two turn signal bulbs.
I run LEDs in my K11 clusters. They're 0.2W. And they're early LEDs so they are polarized and don't allow a reverse current.
I could be wrong but I'm pretty sure that the presence of a temp warning bulb does not impact engine temp as your first post suggests.
Can't hurt to try though.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE |
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Sat Sep 30, 2023 1:01 pm Post subject: |
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| Flying Duck wrote: | The stock warning bulbs are 3W. The 4W bulbs are for the two turn signal bulbs.
I run LEDs in my K11 clusters. They're 0.2W. And they're early LEDs so they are polarized and don't allow a reverse current.
I could be wrong but I'm pretty sure that the presence of a temp warning bulb does not impact engine temp as your first post suggests.
Can't hurt to try though. |
Okay cool! I’m very skeptical as well, but the post made a very compelling case. I’m also running out of things to troubleshoot, so I’m just trying everything. The issue is that it’s running rich, it’s not anything with the engine temp itself. Sorry if that’s the way I communicated it, that’s my bad. The theory is that the light needs to be functioning, and if it’s not, it’s essentially the same as the light being on, and it can supposedly affect the fuel ratio causing a rich condition.
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Scott_Anderson
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Joined: 05 Sep 2006
Posts: 3119
Location: Central Iowa, USA
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| Posted: Sun Oct 01, 2023 6:51 am Post subject: |
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With your wiring, do you also have the air temperature sensor connected?
The factory sensor would have been located in the top of the air-box.
I have not seen a fuel management system yet that doesn't look at both water temperature and intake air temperature for mixing fuel.
Like Duck, I have doubts that the high temperature indicator would affect mixture.
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Ride safe.
1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Sun Oct 01, 2023 12:26 pm Post subject: |
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Hey Scott! Yes the intake temp sensor is hooked up. I have doubts about it doing anything either, but I’ve pretty much done everything I could do at this point. Just running out of ideas so I’m grasping at straws hoping that maybe by some miracle it does do something! Haha. I just wanna ride the darn thing, but I just replaced the o2 sensor and after one ride it’s already caked with soot. so I’m trying to get it sorted before I ride again. I dont want to have to get another one!
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Mike d
Mad Brick Rider
Joined: 19 Feb 2010
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Mon Oct 02, 2023 2:16 pm Post subject: |
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Hey Mike! Yessir, the tps is working, and set to .375 on the dot!
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Scott_Anderson
Site Admin
Joined: 05 Sep 2006
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Location: Central Iowa, USA
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| Posted: Tue Oct 03, 2023 5:37 pm Post subject: |
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I'm going to e-mail you a couple of Motronic documents from BMW.
They include information on the older K's and R series bikes, so you have be sure to read the sections carefully to make sure you are looking at the correct info.
_________________
Ride safe.
1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.) |
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Tue Oct 03, 2023 10:29 pm Post subject: |
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| Scott_Anderson wrote: | I'm going to e-mail you a couple of Motronic documents from BMW.
They include information on the older K's and R series bikes, so you have be sure to read the sections carefully to make sure you are looking at the correct info. |
Oh wow, that would be awesome! Thank you very much
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Tue Oct 03, 2023 10:50 pm Post subject: |
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Okay, so I only got the 2nd email for some reason.. but I did read through and I was expecting it to be much more complicated! Found the section talking about the coolant sensors and yeah it doesn’t seem like the light is gonna have an impact on anything.. The lights are arriving tomorrow though, so we’ll see if anything crazy happens. However my expectations are extremely low.
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Jrb98
Joined: 27 Sep 2023
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Location: Michigan
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Wed Oct 04, 2023 11:00 pm Post subject: |
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Okay! So I installed the light and it lit up with turning the ignition on. Upon starting the bike it ran TERRIBLY and sounded like it was missing cylinders. After keeping it running for a few seconds it came right around and was running beautifully. Used to sound like it had a cam in it with a really unstable idle and now sounds nice and smooth. Took it for a ride and hit higher rpm’s easier than normal and no strong fuel smell anymore! Upon returning home, the light does not turn on with ignition anymore. Is this normal when the bike is warm? Im trying to stay skeptical here and I’ll do more riding tomorrow (it’s 11:00 pm here lol). But it really seems like this may have been what has been stumping me this whole time. I’m HOPING anyways.
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Scott_Anderson
Site Admin
Joined: 05 Sep 2006
Posts: 3119
Location: Central Iowa, USA
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| Posted: Thu Oct 05, 2023 6:31 am Post subject: |
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I resent the doc. Not sure why it didn't go through.
_________________
Ride safe.
1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.) |
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Jrb98
Joined: 27 Sep 2023
Posts: 12
Location: Michigan
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| Posted: Thu Oct 05, 2023 1:14 pm Post subject: |
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| Scott_Anderson wrote: | | I resent the doc. Not sure why it didn't go through. |
Thank you Scott! I got it this time haha. I guess my last question is, is coolant temp warning light supposed to always come on when turning on the ignition? It did when I first hooked up the light, but now it doesn’t. Thanks
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Scott_Anderson
Site Admin
Joined: 05 Sep 2006
Posts: 3119
Location: Central Iowa, USA
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| Posted: Fri Oct 06, 2023 7:18 pm Post subject: |
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My coolant temp light always comes on when I turn on the ignition as a "lamp check". It goes out as soon as the motor starts.
_________________
Ride safe.
1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.) |
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