Tryin to help a friend
#1
11-27-2007, 06:16 AM
Tryin to help a friend
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
#2
11-27-2007, 06:22 AM
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#4
11-27-2007, 06:54 AM
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RE: Tryin to help a friend
ORIGINAL: SoCal_Pappy
Check for a Vac Leak @ or around the Intake.....
Check for a Vac Leak @ or around the Intake.....
#5
11-27-2007, 07:53 AM
Road Warrior
RE: Tryin to help a friend
I had an 05 Nightrain with the exact same setup. Mine developed a real bad intermitten stumble and bad decel popping. Took it toa dealer and they found a bad fuel regulator at 44,000 miles. Not sure if that's your problem but it fixed mine.
Laughed at them when they kept asking me what kind of fuel management system I was using because they couldn't find one. Said I had to have one with the stage 1 air cleaner and V&H pipes. The dealer I boughtit fromdownloaded a map direct to the stock ecm. It ran great and got 50 miles to the gallon. Saved me money as I had no plans on changing anything.
Laughed at them when they kept asking me what kind of fuel management system I was using because they couldn't find one. Said I had to have one with the stage 1 air cleaner and V&H pipes. The dealer I boughtit fromdownloaded a map direct to the stock ecm. It ran great and got 50 miles to the gallon. Saved me money as I had no plans on changing anything.
#6
11-27-2007, 08:36 AM
RE: Tryin to help a friend
Thanks for the tips guys. I didn't think of a vacuum leak. That would be easy to check. Any ideas how I can check the fuel regulator because I took the bike out and did notice the engine miss a little?
Mannish Hawg, he never had a problem before. The factory ecm download worked great for him for three years and he wanted to fix the problem first before introducing any other variable.
Mannish Hawg, he never had a problem before. The factory ecm download worked great for him for three years and he wanted to fix the problem first before introducing any other variable.
#7
11-27-2007, 08:50 AM
RE: Tryin to help a friend
Decel pop is caused by a lean condition created by suddenly shuting down the throttle , something has changed if it did not do it before. A lean condition can be caused by more air coming in, or more exhaust flowing out faster. Has he replaced the air filter element with another? Or it could be his exhaust has burned out some and this is the cause. Even new bikes with stock muffs decell pop if you drop the throttle quick to off, you just dont hear it thru the stock muffs.
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#8
11-27-2007, 09:25 AM
#9
11-27-2007, 01:02 PM
RE: Tryin to help a friend
ORIGINAL: Hardly Dangerous
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
1) lean running
2) air leak, likely right at the head connection
PCIII can reset if there's a power spike. Have it checked for setting/programming retention. Obviously check for leaks.
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