Rough idle troubleshooting
Thread Starter
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Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
Could also be a bad crank sensor or temp sensor , have seen some go without throwing a code , check the connections first before replacing them , cheap enough to replace . I try not to get into the habbit of throwing money at parts , but sometimes it's worth the gamble .
If I'm not mistaken , the 12 does not have an IAC valve , but cleaning the map sensor and throttle body / butterfly was a good idea .
You mentioned your bike ran well at cold start , but ran rough after it warmed up , makes me think temp sensor . Just a guess here .
Another thing , when was the last time you were in the tank ? Dirty fuel filter , bad pressure regulator etc , filter should be changed every 25K .
If I'm not mistaken , the 12 does not have an IAC valve , but cleaning the map sensor and throttle body / butterfly was a good idea .
You mentioned your bike ran well at cold start , but ran rough after it warmed up , makes me think temp sensor . Just a guess here .
Another thing , when was the last time you were in the tank ? Dirty fuel filter , bad pressure regulator etc , filter should be changed every 25K .
Seasoned HDF Member
Joined: Nov 2018
Posts: 10,833
Likes: 6,485
From: Canada Flats
As posted earlier by nevil , you should start by checking for codes , that might just lead you in the right direction .
https://university.fuelmotousa.com/a...ble-codes-dtc/
https://university.fuelmotousa.com/a...ble-codes-dtc/
This here, possibly a pin hole leak in the fuel line inside the tank. Once gas level goes down past the fuel line is when the fouling up begins. Plus you can change your fuel filter also, probably needs to be done.
Ride safe!
Ride safe!
Last edited by nutsandbolts5212; Oct 31, 2022 at 10:47 PM.
Thread Starter
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Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
No codes. Realize I need a $200 "special tool" (to get into the fuel tank to look for pressurized fuel leaks and change the fuel filter) that Harley doesn't even have in stock. Well, shoot.
Onward to check other things while I figure out a solution to the cam ring remove/replace.
Onward to check other things while I figure out a solution to the cam ring remove/replace.
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,282
Likes: 1,139
From: southeast PA
Although it would help, you don't need a tool too check for leaks, just your eyes and ears. With a low level of gas in the tank, take off the cap and prime the fuel pump with the run/stop switch. You might be able to see/hear fuel spraying against the tank wall.
Seasoned HDF Member
Joined: Nov 2018
Posts: 10,833
Likes: 6,485
From: Canada Flats
If the tool your talking about is the one that spins the ring to remove the fuel pump , all you need is a small length of wood or dowel and a hammer , kinda caveman , but it works , save your bucks .
If you do plan on keeping this bike for any length of time , it wouldn't hurt to replace those inner parts , fuel filter / screen , hose and regulator . With 150,000 on it , not sure when the filter would have been changed last , I would do everything , inspect the pump .
Would be smart to test the fuel pressure , but I would start by replacing everything but the pump .
If you do plan on keeping this bike for any length of time , it wouldn't hurt to replace those inner parts , fuel filter / screen , hose and regulator . With 150,000 on it , not sure when the filter would have been changed last , I would do everything , inspect the pump .
Would be smart to test the fuel pressure , but I would start by replacing everything but the pump .
Thread Starter
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Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
Welp, here is where it's at so far-
Three fuel tanks with Techron Fuel Injection System Cleaner
Can of Seafoam into the throttle body to clean the intake.
Cleaned the sensor that projects into the throat of the throttle body
New spark plugs
New spark plug wires
New air filter
New fuel filter
New engine temp sensor
No codes to indicate a problem through the bikes own self analysis. I haven't had the dealer try their computer analysis yet.
The bike seems to run fine for the first few minutes after a cold startup, and runs fine above idle both under load and at cruise. It intermittently runs just horrible at idle. Scary, not just rough, almost like it's detonating or something. It seems to me that those facts would be clues to what is going on, but I'm still searching.
Three fuel tanks with Techron Fuel Injection System Cleaner
Can of Seafoam into the throttle body to clean the intake.
Cleaned the sensor that projects into the throat of the throttle body
New spark plugs
New spark plug wires
New air filter
New fuel filter
New engine temp sensor
No codes to indicate a problem through the bikes own self analysis. I haven't had the dealer try their computer analysis yet.
The bike seems to run fine for the first few minutes after a cold startup, and runs fine above idle both under load and at cruise. It intermittently runs just horrible at idle. Scary, not just rough, almost like it's detonating or something. It seems to me that those facts would be clues to what is going on, but I'm still searching.
Last edited by GlennJ; Nov 11, 2022 at 12:07 PM. Reason: Supply more detailed information of efforts so far
Thread Starter
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Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
Thanks, I did as you suggested and could not hear anything that sounded like a leak
Edit : This is a messed up reply. I forgot to quote the original comment.
Edit : This is a messed up reply. I forgot to quote the original comment.
Last edited by GlennJ; Nov 11, 2022 at 10:48 AM. Reason: mistake
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Thread Starter
|
Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
Thanks, I did as you suggested and was unable to hear anything that sounded like it would indicate a leak.
Thread Starter
|
Cruiser
Joined: Aug 2012
Posts: 130
Likes: 26
From: West Michigan
If the tool your talking about is the one that spins the ring to remove the fuel pump , all you need is a small length of wood or dowel and a hammer , kinda caveman , but it works , save your bucks .
If you do plan on keeping this bike for any length of time , it wouldn't hurt to replace those inner parts , fuel filter / screen , hose and regulator . With 150,000 on it , not sure when the filter would have been changed last , I would do everything , inspect the pump .
Would be smart to test the fuel pressure , but I would start by replacing everything but the pump .
If you do plan on keeping this bike for any length of time , it wouldn't hurt to replace those inner parts , fuel filter / screen , hose and regulator . With 150,000 on it , not sure when the filter would have been changed last , I would do everything , inspect the pump .
Would be smart to test the fuel pressure , but I would start by replacing everything but the pump .