HELP!!!!! - Wrist Twisters
 
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post #1 of 18 Old 11-10-2012, 08:57 PM Thread Starter
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HELP!!!!!

2002 919, original owner. All parts oem

Bike sat for a year with gas in the tank. After replacing the battery the bike's fuel pump failed. Replaced entire fuel pump assembly (including fuel filter). After which the bike started but had smoke and gas coming out of the exhaust pipes and gas in engine oil (did not drive it during this). Determined fuel pressure regulator had failed. Replaced the FPR, spark plugs, changed oil and filter twice. Bike ran better, but when rpms are low (and I am in a higher gear, as if you are trying to lug the engine) and you give full throttle (esp going up a incline) bike seems to be hesitating or misfiring just briefly. Tried fuel injector cleaner and driving it hard, no effect. I checked compression which was in spec. I replaced the fuel injectors, but problem remains. Took it to the dealer, $300 dollars later they found that the ecu had a grounding short to the air intake flapper. I replaced the ECU, to no avail. I didn't really drive it that much before or in that manner but I dont think this was present before (does anyone else experience this?) any thoughts would be greatly appriciated as I am at a loss.

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post #2 of 18 Old 11-10-2012, 09:17 PM
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any more info on what happened at the dealer? did you just have them hunt down the problem then you just replaced the ecu? What do you mean by flapper?

if that is the case it sounds like you just have a short somewhere in the wiring to this "flapper" or within the "flapper. do you mean the IAT sensor? (intake air temperature)


more info please

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post #3 of 18 Old 11-10-2012, 09:24 PM
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So specifically what RPM and in what gear are you seeing the hesitation and misfire? Any evidence above 3000 RPM?
I never really have tried heavy throttle from a low RPM. I'll give it a try.
Does it idle smoothly? From what i understand throttle body synchronizing could affect low speed smoothness.
All OEM parts - does that include air filter and exhaust? And no mods?
Mark

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post #4 of 18 Old 11-10-2012, 10:23 PM Thread Starter
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@
boogun, told them what was going on and asked them to find wtf was going on. They said they felt what I was talking about but it seemed minor and until I replaced the ecu they couldn't continue the hunt. I replaced the ecu as they said the wire harness was fine and the flapper valve opens and closes now.
@mark: occurs sub 2000 rpms. If I down shift properly I have no prob. but if I deliberately slow down while remaining in a higher gear (5th or 6th) and the give it WOT I feel a little bit of a stumble for just a second or two (and I can't always get it to do it). It is worse under load, so if I do this while going up a mountain road. Yes all OEM from Honda, no mods.

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post #5 of 18 Old 11-11-2012, 12:03 AM
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WOT from low revs under load in a high gear is an unusual thing to be doing, it seems to me. Have you always done it? Did the engine respond the same way before you parked it? Is it not possible to avoid this circumstance? Is it worth worrying about?

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post #6 of 18 Old 11-11-2012, 12:09 AM
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What k1W1 says

I like to keep the rpms above 3200 ideally. I've never done wot from 2k unless I'm in 1st or 2nd. Also the flapper in the intake is vacuum controlled.. you sure on this dealer?

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post #7 of 18 Old 11-11-2012, 08:55 AM
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I'll try a WOT in 5th from 2000 rpm...
My calculations say that 2000 RPM in 5th is 29.6 mph. For reference - red line in 5th is 140.4 mph. Quite a range. (I've got an old spread sheet to calculate this.)

Take care,
Mark

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post #8 of 18 Old 11-11-2012, 09:59 AM Thread Starter
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Of course I don't normally drive in this range, it something I noticed and now it's bugging me.

@mark: thanks!

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post #9 of 18 Old 11-11-2012, 11:38 AM
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It's not something I've ever done, so I don't know how my own bike would respond, but under the circs you describe, I'm not surprised you get a bit of a stumble and cough from the fuelling system - you are asking quite a lot of it.

Sorry to hear it's bugging you, but I don't think it's symptom of anything bad. If it happened when you rolled on the throttle, rather than whacking it open, that would be more of a cause for concern, IMO.

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post #10 of 18 Old 11-11-2012, 03:44 PM
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the flapper valve vacuum solenoid is controlled by the ecu.

The bike should have no problems pulling from low rpms (like 1.5k) on in 6th gear WOT... i do it all the time screwing around. It should pull straight through without any hesitation. It will bog if your down that low in rpms then wack the throttle SUPER fast to wot, thats just a nature of a motor in general. But if your having issues rolling on to WOT at low rpms (im talking like taking 1 second to go from full closed to WOT is all) then theres something up.

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post #11 of 18 Old 11-12-2012, 05:41 AM
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Ok, stupid question...What is WOT?

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post #12 of 18 Old 11-12-2012, 05:52 AM
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Wide open throttle

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post #13 of 18 Old 11-12-2012, 05:58 AM
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Well Duuhh. Thanks for makeing me just a little less dumb.

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post #14 of 18 Old 11-12-2012, 06:50 AM
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I can understand when something isn't "right" how it can be annoying. However... Considering all the time and money youve spend on this problem, you might consider getting a PC3 and having it tuned on a Dyno. Some folk feel the throttle response was never right to begin with. Hopefully some others can comment on this approach.

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post #15 of 18 Old 11-12-2012, 11:56 AM Thread Starter
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It just feels off to me, but I am not dropping any more big$ into it. Was hoping there might have been something simple I might have missed.

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post #16 of 18 Old 11-17-2012, 05:46 AM
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Quote:
Originally Posted by doc
It just feels off to me, but I am not dropping any more big$ into it. Was hoping there might have been something simple I might have missed.
Stupid question did you gap the spark plugs correctly? Check the valve clearances? Did you clean the tank? Could be some junk in the tank still. Just a couple ideas good luck

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post #17 of 18 Old 11-18-2012, 09:32 AM Thread Starter
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Spark plugs are good, never checked valves but it only has 3500 miles on it.

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post #18 of 18 Old 11-18-2012, 09:52 AM
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Quote:
Originally Posted by doc
Spark plugs are good, never checked valves but it only has 3500 miles on it.
One more easy thing make sure your battery cables and all connections are tight. My old gsxr used to act up when the cables rattled loose from me riding like I stole it

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