MOTOBRICK.COM
TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: allenblakee on November 30, 2013, 06:57:24 PM
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Hey Gents (and perhaps Ladies)-
So I rode my K75 in 16 degree cold, ice and all, and it ran fine and I parked it and headed out for turkey day. Now two days later, the bike won't start. Turns over great, plenty of spark, and fuel comes flying out of the rail if i disconnect the hose on either side of the rail.
Is there a simple way to test the fuel injectors and see if they're actually firing?
Thanks in advance for any help!
-allen
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How do the plugs look, do they look wet like it's flooding?
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the k75 is notorious for flooding in cold weather... some folks actually carry back up spark plugs specifically for this reason...
j o
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The plugs I pulled were clean, and dry as a bone...I think it's a fuel issue, but as I said it pukes fuel through the rail...what might break/disable all the injectors at once? Checked fuses, etc...
The Trace is calling my name!
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Water frozen in fuel filter?
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Would the fuel filter prevent fuel from getting to the rail? There is plenty at the rail and if I leave the hose off and crank she'll puke something fierce.
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did you make sure the plugs were sparking when you had them out...
i would roll it in the house and let it warm up... im thinking it would start right up after it warmed up... if it does then i would be suspect of icing in the fuel delivery system such as the pressure regulator or injectors and commence to drying it out...
if not... thens im thinking electrical...
j o
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thanks, yes I did check the sparkies and they where happy sparkers. i'll play with it tomorrow when it's in the 50's and see if that helps at all.
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I once had a similar problem and it was a battery issue - the engine turned over but there wasn't enough juice to power all systems. Cold weather isn't good for batteries either -- do you have a battery tender on it?
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No battery tender (hadn't needed one to this point), but the same thing was happening when I jumped it with my car...I will run through so more complete diagnostics tomorrow when the sun and he weather are both in a better mood. Any thing else I should check while I am poking around?
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Okay with a cooler head, and warmer weather I went and tried to start it again. No dice. Turns over great, all electronics seem to be working as expected. I tested the following things, and I'm still at a loss of what to do next.
1. Overall voltage. I've got it connected via jumpers to my car, so we're at about 14v.
2. Fuel injector coil. All coils are sitting at 16 ohm as specified.
3. Disconnected the TPS, some corrosion on the connector, but even with disconnected it doesn't want to start.
4. Disconnected one fuel injector plug, turned the bike over, and couldn't see an voltage getting to the injector.
5. Tested all the fuses, continuity across them all.
Seems very much like a fuel issue, and I am unsure what would allow instruments, crank, and spark, but no fuel. As I mentioned if I remove the hose from the rail, it'll push a stream of gas through, and I can hear the fuel pump recharge the system when done cranking.
Sad day for my K!! Want it back on the road!!
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this is a 4 cylinder l-jetronic trouble shooting guide... you have a 3 cylinder l-jetronic i believe... maybe of some help... (http://hrsbstaff.ednet.ns.ca/bvogel/K100/download/bike-wont-start1.htm)
j o
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Thank you Johnny, found this in an additional post, so I'm working through it now...at least gives me something to poke at while trying blindly to figure out what is going on!
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its always good to pull your l-jetronic plug and make sure its clean... then reset it... sounds whacky butts sometimes thats all it takes...
j o
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I am willing to try just about anything...how do I "reset" it? Thanks Johnny!
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w00t!!! You are my hero Johnny!!! I pulled the connector to the ECU, let 'er sit, plugged it back in, and we're off to the races!!! :2thumbup:
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there you go... i made another positive contribution to motobrick.com beyond moes driveway and donkeys and pizzing...
j o
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Yup, far more useful than your average donkey for sure. 100+ miles on the Nachez-Trace to make sure everything is working, and I'm happy to report the bike has never performed better. Thank you again!
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Quite a few of us have had run issues traced back to bad connections and corrosion in connectors. I had a run issues solved with cleaning the ECM connector and some fresh dielectric grease. The plug for the fuel tank is another common source for problems.
The dielectric grease (that white dusty paste you see in connectors) has been baked out over the 18+ years since our bikes were built. Good preventative maintenance next big service is to clean and reapply on all connections.