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103 stage V rough idle

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Old 05-04-2010, 03:05 PM
mgabr00 mgabr00 is offline
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Default 103 stage V rough idle

hey guys
I recently installed a 103 stage 4 kit on a 2010 ultra glide.
I have a very rough idle ,the RPM is unstable and if I try to go cruising on low RPM and specially on low gear ,the bike feels very funny.
I am about to to disassemble the throttle body and check it for leakage and reinstalling again .
any opinions will be greatly appreciated
thanks

Last edited by mgabr00; 05-04-2010 at 03:20 PM.
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Old 05-04-2010, 03:59 PM
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rambobob rambobob is offline
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I had an injector plug go bad shortly after my build. Ran like crap. It showed up on the codes.
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Old 05-04-2010, 08:36 PM
Dalton Dalton is offline
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Check for a vacuum leak at the throttlebody/head mating area.

In your signature you list the SEST with custom map. How did the tuner do this with the bike not running right?
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Old 05-05-2010, 12:55 PM
mgabr00 mgabr00 is offline
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Quote:
Originally Posted by Dalton View Post
Check for a vacuum leak at the throttlebody/head mating area.

In your signature you list the SEST with custom map. How did the tuner do this with the bike not running right?
that's what I was planning to do,
the map was done by running the smart tune ,I did it myself.
the bike runs better but only at high rpm
on neutral i get some black smoke when i hit the throttle
also what is the spark gap for a stage 4 103 engine ? any idea ?

Last edited by mgabr00; 05-05-2010 at 12:57 PM.
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Old 05-05-2010, 09:12 PM
Dalton Dalton is offline
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Depending on what is causing the rough idle, black smoke when "blipping the throttle could be many different things. With a vacuum leak, the O2 sensors are going to sense a lean condition and tell the ECM to dump more fuel. Same with an exhaust leak. If you didn't get the VE tables tuned right, the ECM may be dumping tomuch fuel. The accel enrighment may be set too high, and the list goes on and on. You will first have to ensure you dont have any leaks, then start to address the tune.
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Old 05-07-2010, 12:22 PM
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HardyHarHarley HardyHarHarley is offline
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I had idle issues when I first got my Stage IV completed (by the dealer.)

I took it back. Vacuum leak was the issue they said. It had thrown a code as well. Why they didn't find this before letting me have it is unknown.

I do not know exactly what was done to cure the vacuum leak.

Sorry can't be of more help. But safe to say our symptoms were the same and mine cure was to check for vacuum leaks.

Jim
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103, 103", 2010, black, body throttle, davidson, harley, idle, injection, limited, motorcycle, rough, smoke, stage, stage 4, vibration

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