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Dyna acceleration issue.

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Old Nov 9, 2023 | 11:10 AM
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Default Dyna acceleration issue.
08 dyna low rider. Ok so ive been trying to get to the bottom of this issue for about a month now. When accelerating rapidly my engine will bog down like its not getting enough gas. New spark plugs, fuel pump, fuel filter, new gas lines in the tank, new air filter, all new gaskets in the rocker boxes, new cam tensioners and exhaust gaskets. And its still happening. Next step im going to replace 2 more o rings at the fuel pump that i didnt change before and new o2 sensors then another tune. But i feel like im chasing my tail on this.
Any ideas what else could be going on?
 
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Old Nov 9, 2023 | 11:12 AM
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Also forgot to mention i went ahead and replaced my engine temp sensor, and my oil pressure sensor
 
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Old Nov 9, 2023 | 11:23 AM
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Not enough info.. Mileage, are you the original owner if not how long have you had the bike? Any engine mods, tuners? Any crap in the tank, Did you have the injectors tested?? Does it do it when sitting and reving, what RPM range and in which gears.. Are you lugging the motor? Did you test for vacuum leaks at the intake seals.. Do you have any tools to monitor AFR's? Lots of variables.. Oh and the biggest thing, did you check for codes?
 
Last edited by 98hotrodfatboy; Nov 9, 2023 at 11:27 AM.
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Old Nov 9, 2023 | 11:25 AM
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Did you check for codes?
 
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Old Nov 9, 2023 | 11:28 AM
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Fsm???
Might be cheaper to bring it into the Moco and have them do an hour diagnostics on it...
 
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Old Nov 9, 2023 | 11:44 AM
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Originally Posted by 98hotrodfatboy
Not enough info.. Mileage, are you the original owner if not how long have you had the bike? Any engine mods, tuners? Any crap in the tank, Did you have the injectors tested?? Does it do it when sitting and reving, what RPM range and in which gears.. Are you lugging the motor? Did you test for vacuum leaks at the intake seals.. Do you have any tools to monitor AFR's? Lots of variables.. Oh and the biggest thing, did you check for codes?
All good points. I was wondering about the injectors but have not tested them myself. Im not the original owner of the bike but ive had it since july of 2018. Bike has 83k miles on it. It acts up anywhere between the 3,000 to 5000 rpm range but only when i accelerate hard, and doesnt seem to matter which gears im in but i tend to ride mostly between gears 2, 3, and 4. If i ease into it it seems to handle it. No i havent checked for codes. I have a tts mastertune that i think i can scan for codes with but not sure. When i changed my filter, it was black so there may be crap in the tank. But ive drained it and refilled it since. Im wondering too if the voltage on my battery is a factor cause thats almost 3 years old. Ill test that when i get to work today. As for the intake seals, i did replace the ones going to the throttle body from the intake itself. I have the other ones for the throttle body so i may just go ahead and replace those in the next couple days to be thorough. As for other engine mods, yes. K&N high flow intake, tbr gen II 2into1 pipes, alto carbonite high performance clutch, chain conversion mod, and if course the tts mastertuner.
 
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Old Nov 9, 2023 | 11:49 AM
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Did you check the fuel pressure under a load?
 
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Old Nov 9, 2023 | 11:52 AM
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Originally Posted by jake24lt
Did you check the fuel pressure under a load?
To be totally honest i dont know how to do that. Ill look into some videos
 
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Old Nov 9, 2023 | 01:38 PM
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I just purchased a fuel pressure tester gauge from J&P cycles.. Haven't used it yet just got it delivered last night.. Thought the price was very reasonable.. it's called the Fuel Tool .

https://www.jpcycles.com/fuel-tool?g...0aAk9hEALw_wcB
 
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Old Nov 9, 2023 | 06:05 PM
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When the motor bogs down does it have a miss or does it feel more like the brake is on?

If you missed the O ring behind the pump, the motor may be sumping. Feels like the brake is on..
 
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