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Weird stalling issue FE390

T

TavisB

Joined Aug 2015
11 Posts | 0+
Pittsburgh, Pa
I've had some issues with my 390 quitting on me. So far I have replaced the fuel pump, replaced the injector, all new fuel filters, checked the valves, new plug and plug cap, and set the tps.

What it does is it will start right up and then while idling for a while (seems like once it warms up) it will just die and not want to restart. Here's a vid from today. I don't know why I kept messing with the throttle...was just a WTF??? moment I guess :). Once it started back up I rode it a little over 20 miles and it was running great.



One other thing, sometimes it sounds a little like there is an occasional miss while it idles. Not 100% sure if it is a normal sound or not.

Ideas?
 
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maybe it's just my computer, but I cannot hear the engine in your video... just some noise...
 
If I’m not wrong you shouldn’t be able start the bike by giving it throttle so My guess would be to play with TPS setting slightly/lower Your meter might be off. Don’t know just guessing
 
Tps checked with multiple meters, it's spot on. I have to check it through the whole range now, at times I've been able to get the bike to die by slightly cracking the throttle open a bit. Might have a bad spot.

Sent from my Pixel XL using Tapatalk
 
If you are starting it with the throttle open a tad the ecm will think the throttle is not open and will think the throttle is at rest. Than when you drop the throttle it will show well below required voltage and the bike will shut down. With a failing TPS this is very common. Try holding your throttle at return fully and starting the machine then test ride to see if it stalls?
 
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Checked the TPS through it's whole range and it seems to be fine.

I get the feeling that this is an electrical issue. It will run fine one minute and then suddenly die and will not start at all. Then for no reason will fire right up the 2, 3, 6, 8th time I hit the button. Think I need to start with the kill switch circuit.
 
Check earth point/s on the frame, check earth splices may be corroded, or some other bad connection in the harness. Had a similar issue with a ktm a while back, swapped ecu, ign coil, throttle body, realys and stator, and still had the same issue, which left only the wiring harness, after swapping the harness the issue was resolved. I had determined beforehand that the problem was not mechanical.
 
Thanks. I'm going to double check that there is no fuel issue tonight and if that is correct I'll start examining the wiring.
 
So yesterday the bike wouldn't fire at all. I was going to spray a little starting fluid in the TB to make sure that it wasn't a lack of fuel, but today it fired right up first hit of the button and idled like a champ.

Yesterday I suspected a wiring issue because my LED turn signals were acting weird, but it looks like that was a faulty relay.

These intermittent problems are a pain to troubleshoot. I'll post again if I can figure more out.
 
I had a problem with the loom near the headstem (where the loom bends) the orange wire broke and was only making intermittent contact and causing starting issues, maybe a similar problem could be the issue that a wire is loose and its earthing or breaking contact?
 
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So last time I started her up she fired first push of the button and idled away like new. Turned it off and it sat two days. Went to start it today and absolutely nothing. Sprayed a little starting fluid in the TB and nothing (rules out fuel, right?).

Oddly...if I wiggle the kill button it fires. I noticed this before but I thought I disconnected the switch and was still having issues. Could be remembering wrong.

I put on a new kill/light switch so will see if that makes a difference.

Edit: New kill switch didn't help. Must have been coincidence. Turn signals still acting weird as well. The search continues...
 
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Take a closer look at the loom/cables behind the headmask and where they go past the breather hose. They move around when you steer and had my kill switch cable rubbed bad there.
 
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I've confirmed that I have a bad ground situation, as least for my turn signals.

Now I have a couple more questions that might help me.

1. Did this bike come from the factory with turn signals? If so, where are they supposed to ground to? Mine were grounded to the top triple clamp which is not working out.

2. Assuming that both issues I have are due to a bad ground...where should I look for a bad ground that would be preventing spark?
 
TavisB said:
I've confirmed that I have a bad ground situation, as least for my turn signals.

Now I have a couple more questions that might help me.

1. Did this bike come from the factory with turn signals? If so, where are they supposed to ground to? Mine were grounded to the top triple clamp which is not working out.

2. Assuming that both issues I have are due to a bad ground...where should I look for a bad ground that would be preventing spark?
Click to expand...

No, it did not come with turn signals. I'm not sure what kind of kit was used, but they shouldn't have a separate ground. They should just plug into a harness. There are OEM parts available that make it a truly plug and play situation regarding street legal lighting.

If your turn signals have a separate ground that is wired to your top clamp, I would have a good look at the rest of the wiring on the bike. It sounds like it may need a little sorting.

I created an Excel file of all the OEM parts I used to install street legal lighting on my (at the time) stock 2011 FE390. I can email it to you if you'd like. You can also look at an EU spec spare parts list to see how things go together since they were street legal with signals and such.

I attached a pdf of the OEM parts list. If you want the Excel file PM me your email address.

Here's a link to all things Husaberg. Manuals, parts list, repair manuals, etc.

https://drive.google.com/drive/folders/0B_X2MDkeGC0hNDRubmdrOEV2Rms
 

Attachments

  • 2011 Husaberg FE390 DS Parts.pdf
    336.6 KB
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TavisB said:
I've confirmed that I have a bad ground situation, as least for my turn signals.

Now I have a couple more questions that might help me.

1. Did this bike come from the factory with turn signals? If so, where are they supposed to ground to? Mine were grounded to the top triple clamp which is not working out.

2. Assuming that both issues I have are due to a bad ground...where should I look for a bad ground that would be preventing spark?
Click to expand...

I do own a FE390 having light, turn signals and horn. Yes, they collect the ground wires on the top triple clamp.Since I drove Italian bikes before this one, I checked and improved wiring. Simply draw a wire, 1,5mm2, from the grounding under the saddle to the triple clamp to improve connection.
 
Ook Peter said:
I do own a FE390 having light, turn signals and horn. Yes, they collect the ground wires on the top triple clamp.Since I drove Italian bikes before this one, I checked and improved wiring. Simply draw a wire, 1,5mm2, from the grounding under the saddle to the triple clamp to improve connection.
Click to expand...

Working on just that right now :). Strange that it worked just fine for 7 years and then one day...nope! Wonder what changed...
 
TavisB said:
...Strange that it worked just fine for 7 years and then one day...nope! Wonder what changed...
Click to expand...

Well just from my experience:
- wiring comes loose in fuse box
- wiring comes loose in non-factory connectors
- 70degree rear tank mounting hurts cables and eventually cut through them
- loose cables get broken by the vibrations
- open connectors get corroded
- sensors deteriorate e.g. fuel level sensor lights up with full tank
- screws unscrew by all the vibrations
- filters glog up
- injectors glog up
And many many more in all those years. Most of this happend with the classics I owned. Although the thin wiring on the Husaberg already gave some issues.
 
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jbpetkov said:
Hello
Did you find your problem ?
I ve got exactly the same issue.
Click to expand...
It's running well now. As near as I can tell, I got some bad gas traveling in WV and the fuel filters got funked up again. I had changed them so recently I didn't think to check them again.



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