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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » Archive through July 20, 2015 » Missing/stutter? Engine running poorly « Previous Next »

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Jdm1200
Posted on Tuesday, May 12, 2015 - 09:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

OK first is the engine supposed to rev higher when you start it cold? aka first thing in the morning?
When I start my bike it runs fine at idle. When I leave for work in the morning from a start it will miss /stutter at lower rpms. So much so that it is unnerving taking a curve or turning at low rpm. I ride 22 miles to work and it usually takes at least half way for this to get better. By the time I get to work it is mostly gone. You can feel it at higher rpms but it is not as noticeable or as numerous.
When I leave from work in the evening it still has the problem but it doesn't take as long for it to go away.
2006 Uly, stock ecm, stock pipe. I have had the bike almost 2 years and I do not remember it doing this when I first got it.
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Etennuly
Posted on Tuesday, May 12, 2015 - 12:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

First check the front spark plug wire. They had a tendency to rub through on the idle adjuster cable.

Then pull and inspect the plugs. Likely a partially fouled plug, if they show wet black at all replace them.
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Jdm1200
Posted on Tuesday, May 12, 2015 - 01:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I dont think its a fouled plug. Recently changed. Will check wires again though thanks
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Phelan
Posted on Tuesday, May 12, 2015 - 01:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would reset the TPS if you haven't already and go from there. Al sells the ECMspy cable or you can source it elsewhere, and an older, free version of ECMspy is available.
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Jdm1200
Posted on Tuesday, May 12, 2015 - 04:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Phelan. I need to load some software it seems and get to resetting.
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Tootal
Posted on Tuesday, May 12, 2015 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That also sounds like leaking intake seals. While it's cold try spraying some WD-40 around the intake at the heads. Will have to remove the air scoops but that's not hard. Sounds like the leak goes away with engine heat.
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Jdm1200
Posted on Tuesday, May 12, 2015 - 05:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was thinking along those lines as well.
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Phelan
Posted on Tuesday, May 12, 2015 - 06:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

JDM, email me and I can help you find ECMspy if you need, and the drivers needed to run it. I downloaded them over the weekend.
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Phelan
Posted on Tuesday, May 12, 2015 - 06:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Phelan_z06@hotmail.com
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Jesse_lackman
Posted on Wednesday, May 13, 2015 - 11:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had a bad rear spark plug wire, it burned up into the spark plug boot. It finally burned up so far the cylinder never fired at all. Part of the problem was the wire pushing up in the boot.
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Jdm1200
Posted on Thursday, May 14, 2015 - 01:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks guys. I have been riding the Electra GLide and been real busy at work. Hopefully might get a chance to meddle with it this weekend. Also forgot to mention that there were no trouble codes.. I am going to check plugs, wires and intake seals first before I start computer testing. I am better with carbs than FI but I have messed with power commander before.
Its funny I can rebuild the shovelhead but FI and some electrical are SCARYYY! I mean I don't want to let the magic smoke out!
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Red450
Posted on Monday, June 22, 2015 - 11:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Check the TPS sensor. My bike started behaving in that way but it got worse over time. My TPS was failing. I replaced it with the Duralast and all was well.
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