Idle Problem After Slip-on Install
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5th Gear
Joined: Jul 2018
Posts: 9
Likes: 3
From: KS
Idle Problem After Slip-on Install
Picked up my first bike, a used and in great condition 2013 Iron 883 a few weeks ago. The previous owner only made changes to the bars and a pair of chopped/hollowed out stock exhaust. Ran great and was loud as hell. Well to make me and the neighbors happy, I wanted to tone it down a bit by installing some V&H twin slash cut slip-ons. Installation went very well. However, now the bike is running at a higher rpm at idle, bike is shaking considerably, and itll eventually stall out after a minute or two. I cant figure out whats up. I thought maybe it was an exhaust leak but not sure. Any suggestions would be greatly appreciated.
Before:
After Install:
Before:
After Install:
Last edited by Trippmac; Jul 24, 2018 at 07:56 PM.
Thread Starter
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5th Gear
Joined: Jul 2018
Posts: 9
Likes: 3
From: KS
Would purchasing a V&H Fuelpak FP3 Autotuner possibly help? I just don't know why the bike would be having troubles with just a simple slip-on install. I will also check the throttle lines as I replaced the grips a week prior to adding the slip-ons. However, I didn't experience the higher revs until now.
Seasoned HDF Member
Joined: Aug 2017
Posts: 7,539
Likes: 12,183
From: Indianapolis
Hey, it was worth a shot, hope you're able to figure it out soon, that bike looks too nice to just be sitting.
Grand HDF Member
Joined: Dec 2014
Posts: 4,890
Likes: 553
From: USA
It doesn't sound like the exhaust would cause that kind of issue. I would go back to your grips and check the throttle cable.
Last edited by hscic; Jul 25, 2018 at 09:07 PM.
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Intermediate
Joined: Jun 2018
Posts: 47
Likes: 3
From: Leeds, Yorkshire, UK
An IAC reset might fix it but first check that your cables are all smooth and correctly adjusted. The throttle should snap back to the closed position when it's released. Also, there should be free play in the cables.
IAC (Idle Air Control) reset is :-
Handlebar switch set to run and don't touch it again.
Ignition switch to ON for 10 seconds
Ignition OFF for 10 seconds
Repeat this two more times. Don't touch the throttle during this process. You should here the IAC seeking at some points in the process. It is trying to find its "home" position.
The bike really needs some kind of fuel correction such as an FP3 as does any EFi equipped vehicle that has a modified air filter or exhaust. But, there are loads of EFi Harleys out there with loud mufflers and they seem to run OK.
There are a couple of common reasons for the IAC to go out of range. First one is badly adjusted or stiff cables. Second favourite is User Induced Failure. This is where the rider winds the throttle open while the engine is starting. This will put the IAC out of range if you do it often enough.
IAC (Idle Air Control) reset is :-
Handlebar switch set to run and don't touch it again.
Ignition switch to ON for 10 seconds
Ignition OFF for 10 seconds
Repeat this two more times. Don't touch the throttle during this process. You should here the IAC seeking at some points in the process. It is trying to find its "home" position.
The bike really needs some kind of fuel correction such as an FP3 as does any EFi equipped vehicle that has a modified air filter or exhaust. But, there are loads of EFi Harleys out there with loud mufflers and they seem to run OK.
There are a couple of common reasons for the IAC to go out of range. First one is badly adjusted or stiff cables. Second favourite is User Induced Failure. This is where the rider winds the throttle open while the engine is starting. This will put the IAC out of range if you do it often enough.
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Intermediate
Joined: Jun 2018
Posts: 47
Likes: 3
From: Leeds, Yorkshire, UK
Nearly forgot.
At the risk of pointing out the obvious, the first video you posted has the correct Idle speed for a warm engine. The second video has the correct Idle speed for a cold engine. The Idle revs should drop to normal after a mile of riding on a warm day.
At the risk of pointing out the obvious, the first video you posted has the correct Idle speed for a warm engine. The second video has the correct Idle speed for a cold engine. The Idle revs should drop to normal after a mile of riding on a warm day.
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,310
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From: Eastern NE
And you didn't make any other changes (exhaust only)...???
If you want to check for exhaust leaks...
1. Start bike.
2. Put on a heavy pair of leather gloves (e.g. welder's gloves).
3. Plug exhaust ends w/hands (gloves on, of course).
4. Listen (will hear whistle/hiss, if leaking).
If there's no leak, you're good. Ride bike a bit and get the new pipes broken-in. Remember to re-torque after 50-miles.
If you want to check for exhaust leaks...
1. Start bike.
2. Put on a heavy pair of leather gloves (e.g. welder's gloves).
3. Plug exhaust ends w/hands (gloves on, of course).
4. Listen (will hear whistle/hiss, if leaking).
If there's no leak, you're good. Ride bike a bit and get the new pipes broken-in. Remember to re-torque after 50-miles.