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Buell Forum » XBoard » Archive through September 08, 2012 » Stuttering is back.. « Previous Next »

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Timmyj
Posted on Sunday, July 22, 2012 - 04:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

After this whole ordeal with a mechanic powder coating my bike..

I get this weird problem that occurs low rpms of any gear as well as in idle. Seems like the bike will lose its spark every half a second in the 1k-2.5k range.

I took it to a dealer who checked the grounds and replaced the plugs(one of which was fouled). From then on it seemed okay, but about 1.5k miles later it seems to be returning. Could I be already fouling the plugs again? What's going on?

Here's an old video when it was really bad.
http://www.youtube.com/watch?v=sSB1-CZENVs&list=UU 8YfMpMv-cUiF2yEB2iNjfA&index=1&feature=plcp
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Timmyj
Posted on Sunday, July 22, 2012 - 05:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm not sure if these problems are related, but the bike also seems to be running either lean or rich. It seems to run better when it is cold rather than hot/warmed. I can occasionally smell fuel, and the exhaust sometimes backfires/creates a popping noise when accelerating or first starting the bike up.

And whoever runs the polished silver ceramic coated pipes from American Sport Bike knows that parts of the pipe WILL become opaque by the front cylinder, but mine seems to be creeping to the center of the pipes(because the pipes are getting extra hot?).

There also seems to be a knocking noise coming from the push rods/hydraulic lifters. Can they even MAKE knocking noises?

HELP



(Message edited by timmyj on July 22, 2012)
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Teeps
Posted on Monday, July 23, 2012 - 12:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ever had the tps reset?
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Reepicheep
Posted on Monday, July 23, 2012 - 01:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Interesting that there is no backfiring. That suggests a fuel problem rather than a spark problem. Which is further supported by your "running hot" (which means running lean) observations.

Have you checked the fuel pump and wiring?
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Brumbear
Posted on Monday, July 23, 2012 - 07:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

replace your wires
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Timmyj
Posted on Monday, July 23, 2012 - 08:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What wires should I be pointing at for the Harley/Buell dealership?

What's a TPS reset?

I have not checked the fuel pump as I'm not mechanically inclined I'm going to have to point to this as well.

I really appreciate the posts.
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Brumbear
Posted on Monday, July 23, 2012 - 09:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Spark plug wires
TPS reset is a throttle position sensor reset and must be done with ecm spy or an equivilent there of perhaps someone in the great state of fornicalia can hep a fella out?
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M1combat
Posted on Monday, July 23, 2012 - 09:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah... plug wires/coil/ground...

If not there then go for TPS and then intake seals.

The plug wires are kinda easy to destroy.
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Timmyj
Posted on Monday, July 23, 2012 - 10:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Okay.. I'll have them check those.

-Fuel pump
-Coils
-Plug wires
(if not)
-Intake seals
-Throttle position sensor

This seems pretty straight forward. I'll update if anyone would like me to.
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Reepicheep
Posted on Monday, July 23, 2012 - 10:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Does the tach ever leap *up* when it's stuttering? Like by 1000 RPM?
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Timmyj
Posted on Monday, July 23, 2012 - 11:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

1000 RPM? Isn't that idle?

But no, I haven't experienced that. It only misfires and drops in rpm spontaneously.
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Reepicheep
Posted on Tuesday, July 24, 2012 - 08:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sorry, that wasn't clear. What I mean is the bike is running fine and steady at say 3000 RPM, and at the same time the motor stutters, the tach jumps up to 4000 rpm briefly.

If it does, then I believe it is indicative of a cam position (which is really a crank position) sensor problem.

What was powder coated? That makes me think you have a bad ground somewhere.
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