??? bad fuel pac????
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6th Gear
Joined: Mar 2011
Posts: 12
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??? bad fuel pac????
I bought a 2008 dyna my first Harley used. the bike ran rough at first, then i put on V&H naked air intake, I thought it was bet $125 i ever spent, but in two weeks the dyna is rough again, it feels like diesel tractor. all the smoothness was gone, tried a deferent gas the same problem.
*After the air cleaner went on the bike it feelt like new . 2 short weeks later crap alot of decel pop and feels a little hotter.
3900 miles V&H slip on pipes,fuelpac and V&H air intake.
Any ideas
*After the air cleaner went on the bike it feelt like new . 2 short weeks later crap alot of decel pop and feels a little hotter.
3900 miles V&H slip on pipes,fuelpac and V&H air intake.
Any ideas
Road Captain
Joined: Dec 2010
Posts: 641
Likes: 0
From: swifton,ar
try unhooking the fuelpak and putting stock a/c back on and see if that helps if that helps go online and get new set of numbers from vance and hines website and put it all back on ie... the a/c and fuelpak
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
There's a major flaw with the V&H Fuelpak that you have found for yourself: The O2 sensors are retained and the Fuelpak can't cope with this.
This means that some time after fitting, the ECU thinks that the bike is running rich because of the extra fuel that Fuelpak is causing and drags the fuel back down, over-riding the Fuelpak in all conditions except hard acceleration and high speed. It will take a while for the bike to adjust to this, as you have found.
Plus V&H slip-ons are a bit crap and have poor low/mid rev performance.
One quick and relatively cheap fix would be to fit some Xieds as well as the Fuelpak. This fools the ECU into thinking the bike is running leaner than it is and so won't be so likely to try to drag the AFR back down.
Its all a fudge of course. You are much better getting a proper fueling soution and some decent pipes.
This means that some time after fitting, the ECU thinks that the bike is running rich because of the extra fuel that Fuelpak is causing and drags the fuel back down, over-riding the Fuelpak in all conditions except hard acceleration and high speed. It will take a while for the bike to adjust to this, as you have found.
Plus V&H slip-ons are a bit crap and have poor low/mid rev performance.
One quick and relatively cheap fix would be to fit some Xieds as well as the Fuelpak. This fools the ECU into thinking the bike is running leaner than it is and so won't be so likely to try to drag the AFR back down.
Its all a fudge of course. You are much better getting a proper fueling soution and some decent pipes.
Last edited by Foxster; Aug 24, 2011 at 04:47 AM.
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,250
Likes: 36
From: Montana
If the problem is not your fuel pak you might have an exhaust leak between your slip ons and the head pipes . New exhaust clamps and some high temp silicone (orange if I believe memory serves) are always a good idea.
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6th Gear
Joined: Mar 2011
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Been on the phone again with fuelpac and they said it could be an intake leak. Take off the naked and put back on.
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Seasoned HDF Member
Joined: Jul 2008
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From: southeast PA
First make sure you don't have any mechanical problems like leaks. Before you bother to take off the intake (unless you did it already) get some throttle body or carb cleaner and spray the intake flanges when hot. Do it from the right side and don't get any into the air intake. If there's a change in the idle you have a leak. If not, make sure when you reinstall the intake you torque it correctly.
Like missedem said, look for exhaust leaks too.
Are your plugs even leaner than before? They will be white with the stock setup, too.
Like missedem said, look for exhaust leaks too.
Are your plugs even leaner than before? They will be white with the stock setup, too.
Last edited by nevil; Aug 26, 2011 at 09:21 PM.
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