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Dyna runs rich after ride

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Old Nov 3, 2024 | 11:37 AM
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Question Dyna runs rich after ride

Hello, I have been having trouble with my 2004 Dyna Lowrider EFI idling and wanting to shut off if I accelerate. At start up everything runs fine, but after riding for a good 40min the problem begins. The only way to get the motorcycle moving again is if I very slowly increase the throttle. If I accelerate normally it shuts off and struggles to turn back on. If it does shut off I would have to wait 15 min before it starts right back up and runs fine again. I smell gas and my spark plugs now have carbon deposits covering them. Any idea what to look for? I think it might be something heating up and causing the problem
 
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Old Nov 4, 2024 | 10:20 AM
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Spark plugs black? Too rich sounds like it's flooding it self out. Go by the look of your plugs spark plugs. Adjust your air fuel on carb. Head over to the carb section for how to fix
 

Last edited by Tileman2692; Nov 4, 2024 at 10:47 AM.
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Old Nov 4, 2024 | 10:54 AM
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Originally Posted by DenaliDyna
Hello, I have been having trouble with my 2004 Dyna Lowrider EFI
Originally Posted by Tileman2692
Adjust your air fuel on carb. Head over to the carb section for how to fix
Sorry, I have no experience with MMI fuel injection either.
 

Last edited by Dan89FLSTC; Nov 4, 2024 at 10:55 AM.
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Old Nov 4, 2024 | 01:40 PM
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Oops. Sorry I messed up , not carb. Delete my comment
 
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Old Nov 4, 2024 | 02:19 PM
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QUOTE=Dan89FLSTC;21858232]Sorry, I have no experience with MMI fuel injection either. [/QUOTE]

Are you sure a 2004 Dyna FI is Magneti Marelli (MMI) fuel injection?

My services diagnostics manual and fish looks the same as my 04 Softail?

DenaliDyna, does bike have a aftermarket tuner?

.......


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.




........DenaliDyna, does the mouth of your throttle body look like this last picture. .
 

Last edited by Jackie Paper; Nov 4, 2024 at 02:53 PM.
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Old Nov 4, 2024 | 04:02 PM
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Originally Posted by Jackie Paper
QUOTE=Dan89FLSTC;21858232]Sorry, I have no experience with MMI fuel injection either.
Originally Posted by Jackie Paper
Are you sure a 2004 Dyna FI is Magneti Marelli (MMI) fuel injection?
Let me rephrase my post...

I have no experience with fuel injection of any type...
 
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Old Nov 4, 2024 | 05:37 PM
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I once spent weeks of my spare time chasing a rich running problem on a carbureted bike. Same symptoms: black plugs, stalling, hard to restart, etc. Turns out the problem was the ignition switch causing low voltage to the ignition system, and particularly to the coils.
 
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Old Nov 4, 2024 | 07:16 PM
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On an 04 with on board diagnostic readout display, a low voltage to the coil would probably trigger a P1351, P1352, P1354 or a P1355.

DenaliDyna, does bike have a aftermarket tuner?

Have you checked for codes?
 
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Old Nov 5, 2024 | 02:29 PM
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Originally Posted by Jackie Paper
QUOTE=Dan89FLSTC;21858232]Sorry, I have no experience with MMI fuel injection either.
Are you sure a 2004 Dyna FI is Magneti Marelli (MMI) fuel injection?

My services diagnostics manual and fish looks the same as my 04 Softail?

DenaliDyna, does bike have a aftermarket tuner?

.......


.
.




........DenaliDyna, does the mouth of your throttle body look like this last picture. .[/QUOTE]
Everything is stock and my throttle body is the first picture on top
 
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Old Nov 5, 2024 | 02:31 PM
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I have no codes either
 
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