EFI -running rough low rpm
Thread Starter
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Stage II
Joined: Aug 2005
Posts: 2
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EFI -running rough low rpm
Help
I have an 02 efi fatboy, I changed pipes, and air cleaner, added power commander lll. the bike was running great for a month or two, however I noticed it has been harder to start as time went on. New battery, just won't catch as fast as before. All of of a sudden upon starting, the bike was coughing out the air cleaner and running extremely rough. I richened the the low & med range on the PClll, it help short term but the problem has come back. I have try adjusting the maps after talking with the tech people from PC still no luck. Harley guys don't have any answers for me. If anyone out there has some ideas I would appreciate your help.
Thanks
Tony
I have an 02 efi fatboy, I changed pipes, and air cleaner, added power commander lll. the bike was running great for a month or two, however I noticed it has been harder to start as time went on. New battery, just won't catch as fast as before. All of of a sudden upon starting, the bike was coughing out the air cleaner and running extremely rough. I richened the the low & med range on the PClll, it help short term but the problem has come back. I have try adjusting the maps after talking with the tech people from PC still no luck. Harley guys don't have any answers for me. If anyone out there has some ideas I would appreciate your help.
Thanks
Tony
Thread Starter
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Stage II
Joined: Aug 2005
Posts: 2
Likes: 0
RE: EFI -running rough low rpm
thanks again,
I checked intake, pluds, and wires all okay
I entered a zero map. no change. I then physically removed it, still no luck.
at higher speed/rpm the motor run strong. It's just the low end
I checked intake, pluds, and wires all okay
I entered a zero map. no change. I then physically removed it, still no luck.
at higher speed/rpm the motor run strong. It's just the low end
Stage II
Joined: Nov 2005
Posts: 2
Likes: 0
RE: EFI -running rough low rpm
I have an 02 fatboy as well, 5000 miles, fuel infected, stage 1, Dealer mapping and slipons. LAte this season began having problems after about two miles of riding. When I would let off the throttle it wants to stall and I have to feather the throttle to keep it going. I added injector cleaner and seemed to be better. Also changed plugs but they looked ok. Now it does the same and stalls. If I get it started there is a lot of black smoke and hard to keep going.
Any suggestions?
Any suggestions?
Road Master
Joined: Oct 2005
Posts: 1,034
Likes: 3
From:
RE: EFI -running rough low rpm
ORIGINAL: fatboy02
I have an 02 fatboy as well, 5000 miles, fuel infected, stage 1, Dealer mapping and slipons. LAte this season began having problems after about two miles of riding. When I would let off the throttle it wants to stall and I have to feather the throttle to keep it going. I added injector cleaner and seemed to be better. Also changed plugs but they looked ok. Now it does the same and stalls. If I get it started there is a lot of black smoke and hard to keep going.
Any suggestions?
I have an 02 fatboy as well, 5000 miles, fuel infected, stage 1, Dealer mapping and slipons. LAte this season began having problems after about two miles of riding. When I would let off the throttle it wants to stall and I have to feather the throttle to keep it going. I added injector cleaner and seemed to be better. Also changed plugs but they looked ok. Now it does the same and stalls. If I get it started there is a lot of black smoke and hard to keep going.
Any suggestions?
How did you check for an intake leak? I am thinking it is a leak too. Spray some starter fluid or WD-40 around the intake and see if the engine speeds up. If it does, you got a leak. It's a common problem.
Cruiser
Joined: Sep 2005
Posts: 155
Likes: 2
From:
RE: EFI -running rough low rpm
I'm having an identical problem with my 04 Road King. I'll check for a leak, but I'm not to confident in this being the cause. Are there any other thoughts. I did notice some oil from the crank case vent in the trottle body, but I'm guessing this is somewhat normal. Is there any recommendations on which spray throttle body cleaner is acceptable for HD.
Thanks,
Wayne
Thanks,
Wayne
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Banned
Joined: Jul 2006
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RE: EFI -running rough low rpm
Do a fuel pressure test and see if it holds pressure when you turn it off. If it drops to zero when you power off, you have a hole in your internal line. Usually a hole in a line will seem better if you adjust your PC, but it just masks the problem as the hole gets worse.
Other tip offs, when tank in nearly empty, turn key power on and listen for fuel squirting inside tank. Another phenomenon is sometimes they will run ok with full tanks, but bad when the level goes below the line leak.
Other tip offs, when tank in nearly empty, turn key power on and listen for fuel squirting inside tank. Another phenomenon is sometimes they will run ok with full tanks, but bad when the level goes below the line leak.
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RE: EFI -running rough low rpm
ORIGINAL: One_Screamin_Eagle
Do a fuel pressure test and see if it holds pressure when you turn it off. If it drops to zero when you power off, you have a hole in your internal line. Usually a hole in a line will seem better if you adjust your PC, but it just masks the problem as the hole gets worse.
Other tip offs, when tank in nearly empty, turn key power on and listen for fuel squirting inside tank. Another phenomenon is sometimes they will run ok with full tanks, but bad when the level goes below the line leak.
Do a fuel pressure test and see if it holds pressure when you turn it off. If it drops to zero when you power off, you have a hole in your internal line. Usually a hole in a line will seem better if you adjust your PC, but it just masks the problem as the hole gets worse.
Other tip offs, when tank in nearly empty, turn key power on and listen for fuel squirting inside tank. Another phenomenon is sometimes they will run ok with full tanks, but bad when the level goes below the line leak.
Cruiser
Joined: Sep 2005
Posts: 155
Likes: 2
From:
RE: EFI -running rough low rpm
Thanks Guys,
I was low on fuel and it was acting up, just filled up before I started seaching the site for info on this problem. I'll watch and see if it goes away while the tank is full. Did you fix this internal leak yourself?
I was low on fuel and it was acting up, just filled up before I started seaching the site for info on this problem. I'll watch and see if it goes away while the tank is full. Did you fix this internal leak yourself?