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Shadowracerx1
Posted on Wednesday, June 15, 2016 - 10:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a 1250 engine I put together last year with xb9 pistons. At the end of the riding season the bike started running bad. I checked for air leaks and wiring and found no problems. I reflashed the ECM to an earlier tune.

I started the bike and the front cylinder wasn't firing. Since then I've swapped spark plugs (the front plug was fouled, plug wires and cam sensor.

So what happens now is it will start, warm up idle but bogs in the higher RPM range... then the plugs foul again (more front than back). I'm using megaviewer to try to smooth this out but I'm at a loss. I''m trying to avoid throwing money at it before I have a better idea what's going on.

Any insight would be appreciated.

Thanx
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Akbuell
Posted on Wednesday, June 15, 2016 - 12:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If it ran fine before, and nothing has been changed, then I suspect the fuel injectors have begun to leak or are clogged and spraying fuel, instead of a mist.

There is a procedure in the service manual to check for leaking injectors.

Hope this helps, Dave
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Nillaice
Posted on Wednesday, June 15, 2016 - 05:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

did you upgrade the injectors when you did the 1250 kit ?
or
just change the fuel maps so that the OEM injectors were open for a longer cycle?
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Shadowracerx1
Posted on Thursday, June 16, 2016 - 07:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I upgraded the injectors to Siemens Deka 60LB.
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Nillaice
Posted on Thursday, June 16, 2016 - 12:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

did you leave a rag in the velocity stack the last time you had the air box off?

it happens to the best of us ...
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Shadowracerx1
Posted on Thursday, June 16, 2016 - 12:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I did that Once... : ) I've been using a torch to "unfoul" the plugs. I grabbed some new ones today and I'll throw those in. Could this be a symptom of the ECM going bad?
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Natexlh1000
Posted on Thursday, June 16, 2016 - 01:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would doubt that the ECM would go bad like that.
Since it's the front jug that's doing it, it would have to be something that only affects the front jug.

Like one of the injectors drooling or the ignition coil being half-dead.
Bear in mind the ignition coils on these is actually two independent coils in one box.

I would suggest chasing the injector theory first.
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Shadowracerx1
Posted on Thursday, June 16, 2016 - 02:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had a spare coil (actually I have a spare everything just about) and tried swapping it. I'll check the manual for injector testing options. To be clear... both cylinders are fouling... seems more fouling is happening to the front.

(Message edited by shadow-racerx1 on June 16, 2016)
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Akbuell
Posted on Thursday, June 16, 2016 - 02:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

'08 manual - Sec 4-14. The very last paragraph.
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Shadowracerx1
Posted on Thursday, June 16, 2016 - 02:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My bike is an 03. The 08s had several cool things added for this kind of stuff that aren't on the earlier models (I've heard they have a way of cleaning fouled plugs even.)
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Natexlh1000
Posted on Friday, June 17, 2016 - 12:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

well if they are both fouling up, it could be a bad engine temperature sensor telling the bike to run crazy rich. (like choke stuck shut)
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Akbuell
Posted on Friday, June 17, 2016 - 12:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

S'OK. My '01 tuber manual has a nearly identical check to the '08 manual. It is listed under the throttle body section in both manuals.

Short version is to remove stuff you need to remove so you can look into the intake manifold with the throttle open. Turn the key on, then the stop/run switch. On for 2 sec, off for 2 sec, repeat 5 times. Look in the manifold for signs of raw fuel. The only real difference between the 2 is tuber hold the throttle open, XB the throttle is closed. Don't know about your '03. Throttle closed, maybe?

Dave
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Natexlh1000
Posted on Friday, June 17, 2016 - 02:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah that makes sense. Turning it on pressurizes the fuel line abut not starting the engine up leaves the injectors closed.
If any gets out, it's bad.

I did the same to find out which of my Dodge's 8 squirters it was except I had to pull them all out to see them.
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Shadowracerx1
Posted on Friday, June 17, 2016 - 11:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanx. I"ll try that.

ECMSpy is showing expected temperature... but that's not to say it hasn't gone out of whack.

(Message edited by shadow-racerx1 on June 17, 2016)
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Shadowracerx1
Posted on Saturday, June 18, 2016 - 07:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Injectors tested fine.
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Shadowracerx1
Posted on Sunday, June 19, 2016 - 08:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

ECMSpy shows my AFV to be over 140%. That can't be right can it? Everytime I VE analyze, megaviewer adds fuel. What are the chances my spanking new O2 sensor is the culprit?

How does one test the temp sensor?
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Shadowracerx1
Posted on Sunday, June 19, 2016 - 06:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Resetting AFV has me running well enough to start tuning.
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Natexlh1000
Posted on Monday, June 20, 2016 - 09:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If it tunes itself wrong again, you can blame the oxygen sensor.

If the sensor was reporting too much oxygen, the computer would add more til it smells right.
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Shadowracerx1
Posted on Monday, June 20, 2016 - 04:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Now it's down to 84% *shrug* I'll keep an eye on it.
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Natexlh1000
Posted on Tuesday, June 21, 2016 - 11:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well that's weird. I can understand if it fattens itself up again or if it leaves itself alone but not going the opposite way!

Other than the AFV, is it running OK?
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Shadowracerx1
Posted on Tuesday, June 21, 2016 - 11:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah... I'm up to the 7th version of my tune map. Idle is good, revs to the red line with no hiccups. Need to iron out some niggles...
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