2012 road king flhr **help**
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2nd Gear
Joined: Oct 2022
Posts: 6
Likes: 0
From: San tan valley, az
2012 road king flhr **help**
So I have this war horse, couple months back I had a misfire issue and changed the coil and all was well. Now, it presents the same with the sputtering, sometimes stalls on initial start, backfires, black smoke out exhaust, rough idle, sounds like it's struggling. I get P0505 code but has went away. Fouled spark plugs with black carbon, running rich. Now I've changed AIT, ETS, CKP, has good compression, changed plugs, wires, coil. Checked injectors, throttle body has response and sets idle however bike is bucking. I'm at a loss with what could be happening. Bike ran strong before this. Went to Mexico and broke down on my way back.
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
Cruiser
Joined: Jun 2020
Posts: 199
Likes: 127
From: Valley Head, WV
So I have this war horse, couple months back I had a misfire issue and changed the coil and all was well. Now, it presents the same with the sputtering, sometimes stalls on initial start, backfires, black smoke out exhaust, rough idle, sounds like it's struggling. I get P0505 code but has went away. Fouled spark plugs with black carbon, running rich. Now I've changed AIT, ETS, CKP, has good compression, changed plugs, wires, coil. Checked injectors, throttle body has response and sets idle however bike is bucking. I'm at a loss with what could be happening. Bike ran strong before this. Went to Mexico and broke down on my way back.
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
Road Warrior
Joined: May 2007
Posts: 1,620
Likes: 117
From: ARIZONA
Start looking for a vacuum leak; your intake manifold seals. Check that your O2 sensors and your exhaust mounting nuts are tight. Double check that your compression releases arent loose and causing an issue.
If it was a sudden thing while riding in Mexico, perhaps the Mexican gas jacked up your O2 sensors and the ECU is getting sent some jacked up data. Might not be enough to set a code, but the symptoms will manifest as they are. I wouldnt put it past Mexico to have some leaded fuel contamination in their unleaded tanks.
If it was a sudden thing while riding in Mexico, perhaps the Mexican gas jacked up your O2 sensors and the ECU is getting sent some jacked up data. Might not be enough to set a code, but the symptoms will manifest as they are. I wouldnt put it past Mexico to have some leaded fuel contamination in their unleaded tanks.
Thread Starter
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2nd Gear
Joined: Oct 2022
Posts: 6
Likes: 0
From: San tan valley, az
I checked for leaks with starter fluid, no change in idle. I checked my exhaust with smoke. No air escape. I'm pretty much at a lost. However I just ordered new 02 sensors in case ecm is getting bad info and causing the iratic mixture. Just covering another base. Right now, I've had some pretty knowledgeable people take a look at bike and it's a head scratcher for sure.... thanks for your response.
Road Warrior
Joined: May 2007
Posts: 1,620
Likes: 117
From: ARIZONA
I checked for leaks with starter fluid, no change in idle. I checked my exhaust with smoke. No air escape. I'm pretty much at a lost. However I just ordered new 02 sensors in case ecm is getting bad info and causing the iratic mixture. Just covering another base. Right now, I've had some pretty knowledgeable people take a look at bike and it's a head scratcher for sure.... thanks for your response.
Stellar HDF Member
Joined: Jan 2017
Posts: 2,678
Likes: 2,081
From: Massachusetts
So I have this war horse, couple months back I had a misfire issue and changed the coil and all was well. Now, it presents the same with the sputtering, sometimes stalls on initial start, backfires, black smoke out exhaust, rough idle, sounds like it's struggling. I get P0505 code but has went away. Fouled spark plugs with black carbon, running rich. Now I've changed AIT, ETS, CKP, has good compression, changed plugs, wires, coil. Checked injectors, throttle body has response and sets idle however bike is bucking. I'm at a loss with what could be happening. Bike ran strong before this. Went to Mexico and broke down on my way back.
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
https://youtube.com/shorts/ep8ZGDs4r04?feature=share
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Thread Starter
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2nd Gear
Joined: Oct 2022
Posts: 6
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From: San tan valley, az
good fuel pressure, fuel pump is strong. Hoses are intact.
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Stellar HDF Member
Joined: Sep 2017
Posts: 2,144
Likes: 577
From: memphis
check for broken wires at the AIT and the TB plug. they could be broken or frayed under the casing. they have replacement plugs for both on ebay. they are cheap and easy to replace. I replaced both on my 12 and no more issues.
good luck!
good luck!
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