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Buell Forum » Old School Buell » Archive through May 26, 2011 » Fuel Injection or TPS? « Previous Next »

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Squidravioli
Posted on Tuesday, May 10, 2011 - 09:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My 2000 X1 has the following issues that I would like to clean up. Overall the bike runs pretty good and I wouldn't want to make anything worse.

Very cold natured upon "true cold start". I have to hold some throttle for a solid minute before it will idle on its own.

If you pull a "small" amount of throttle, you hear mostly air-flow and it wants to stall out (actually will stall on occasion). If you give it a descent amount of throttle there is no problem whatsoever with revving the bike.

Rides out pretty good though.

Do I need to have my FI's cleaned or would a TPS reset clear this up?
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Natexlh1000
Posted on Tuesday, May 10, 2011 - 10:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It doesn't sound sick to me.
If it runs right when it's warm, that's what's important.
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Xl1200r
Posted on Tuesday, May 10, 2011 - 10:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have to hold the throttle part open when I start my bike, and I hold it there for 20 seconds or so and then it will idle.

What is your idle speed when it's warm? Maybe it's set a little too low and when it's cold it can't hold it right away.
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Fahren
Posted on Tuesday, May 10, 2011 - 10:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

TPS reset never hurts. Where are the idle rpm's once the bike is warmed up?

It's worth working on this if it doesn't take the bike out of commission - it may be "good enough" right now for riding, but I don't see why you should have to baby it during warm-up. If it rides well once warmed up, I don't think you need to fuss with the injectors.

I'm speaking from XB FI experience, though, not X1.

Edit: someone typed faster than me. But in any case, a proper setup for any FI means NO THROTTLE during startup. The FI system, properly set up, is supposed to do what it needs to inject the right fuel/air for cold start.

Again, I don't know about X1's but for an XB, doing what is known as a "TPS hard reset" (search function for directions) where you are actually making sure the physical TPS is truly zeroed out, can be beneficial - so you don't rely solely on the electronics, but you also get a true closed reading at zero throttle.



(Message edited by fahren on May 10, 2011)
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Hootowl
Posted on Tuesday, May 10, 2011 - 10:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That sounds like TPS error to me. The computer isn't adding fuel at very small throttle openings because it thinks the throttle is still closed. When I put the race ECM in mine it exhibited the same symptom until the TPS offset was set in the ECM.
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Squidravioli
Posted on Tuesday, May 10, 2011 - 04:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'll have to check on the RPMs while warm. I'll probably have a dealership do the TPS reset. I don't have the ECMSpy nor do I want one lol!
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Lager
Posted on Tuesday, May 10, 2011 - 09:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I too had the same troubles as your are experiencing, I also posted up something similar to yours.
MY problem was that the idle speed was set too low. When hot, it was only at 700-800 rpm. When it was cold, just wasnt enough air flow to keep it running.
It was suggested to me, that idle speed when hot should be between 1100-1200 rpm.
So I gave my 99 X1 a twist on the idle cable and now its starts much quicker. Its not perfect, there is no idle air boost circuit in these old FI systems that will hold a fast idle till it warms up. But it did help.
Im a little leary of the TPS reset or another fuel map right now. Hear too many things going bad here on this forum.
Im still suffering some warm stage complaints like surging or a lean feeling till it warms up completely. Since the issue of injector plugging has been brought up? Ive added some BG fuel system cleaner that should take care of it, if thats the case?
26K on my X1 right now, its seems to be running better since the BG treatment, but its only been about 25 miles. Thats about 3 cold start and ride cycles for me. More miles will give me better info about fuel treatments.
Hope this helps?
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Dfbutler
Posted on Wednesday, May 11, 2011 - 02:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

TPS or intake leaks. Reset TPS first since ECM seems happiest when it knows where closed is. Intake leak could also be culprit and could seal when engine heats up.
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