ADVrider

Go Back   ADVrider > Bikes > Orange Crush > Crazy-Awesome almost Dakar racers (950/990cc)
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-10-2013, 07:47 AM   #1
Tardis OP
Tardis
 
Joined: Apr 2013
Location: Melbourne
Oddometer: 2
990 intermittent running issue

Greetings, am turning to the forum after not being able to have the issue rectified at the dealer. My 2010 990 Adv has for some time been behaving badly. After a period of slow and throttle happy running in traffic or trail it can develop a severe misfire that rapidly ends in no forward progress.
The engine appears to be fairly hot when it happens although the temp gauge does not indicate particularly adversely, I note the exhausts appear to be very hot.
The dealer checked the charging circuit, fuel etc but have only been able to replicate it once and then couldn't diagnose. Alternator stator and exhaust CO2 sensors have been mentioned as possible causes but they test OK.
It feels like severe fuel starvation, alas there is no carburettor to unblock ...
Has anybody out there experienced a similar issue and found the cause?
I am becoming slightly desperate, yesterday I found myself at the end of a track in the forest with a failing engine. I let it cool for twenty minutes then was able to get back to the tarmac after which it would only run for a few km at a time. I got to a roadside stop and force cooled the exhaust system and engine with buckets of water which seemed to enable it to run again. After a twenty minute freeway journey when it was fine it immediately started choking when I came back down to the city streets in Melbourne.
Today I ran it for half an hour at high throttle slow speed through two fan cycles ... And it was fine ...
Any prior experiences similar chaps?
Thanks for such an excellent and informative forum.
Tardis is offline   Reply With Quote
Old 04-10-2013, 08:42 AM   #2
DELTATANGO
Motorcyclist and Dog Walk
 
DELTATANGO's Avatar
 
Joined: Nov 2005
Location: Alabama
Oddometer: 13,690
That sound like any over lean condition which will fuck up your engine. I don't know the cause but I wouldn't ride it anymore before getting it fixed.
DELTATANGO is online now   Reply With Quote
Old 04-10-2013, 09:29 AM   #3
Velociraptor
TrackBum
 
Joined: Apr 2005
Location: Seattle
Oddometer: 1,083
Bad fuel pump? Sometimes the pumps will start to fail like that. I had a similar issue with my 690 enduro and it was a poor connection to the coil. Could be so many things though.
__________________
2014 KTM EXC 500
2014 KTM 1290 Superduke R
2009 KTM 690r Enduro SOLD
2002 RC51 SOLD
2010 KTM 990 Supermoto R SOLD
Velociraptor is offline   Reply With Quote
Old 04-10-2013, 09:30 AM   #4
what car??
down the road
 
Joined: Dec 2010
Location: Colorado
Oddometer: 370
tardis when you say misfire, are you meaning a backfire through the exhaust? Does it seem perhaps more like a fuel starved issue than ignition? Were the coils checked out with an oscilloscope or other graphing meter? What about on the injectors? Perhaps the dealer doesn't have those kinds of tools at their disposal. What was the fuel output by the dealer? They've only had it happen once?

I have been experiencing something kind of like that, though my cans aren't super hot and the temp gauge seems about where it should be. Thought the fuel pump seems a bit hotter than I think it should be. But that doesn't explain any kind of backfiring through the exhaust (at least that's where I'm experiencing some kind of backfire, not extreme, but there none the less).

I keep thinking perhaps fuel starved, on a recent ride when it died I pulled the pump and tried to clean the sock as much as I could, couldn't access the main filter (no adequate tools). Still happened a bit later, running rough, choking, and wanting to die (did die momentarily a couple of times). The next day on the way back home from the Mexican border it started up again. Again I let it cool down; it happened a couple of different times. Once the temperature cooled down to around 60F and rain came in, it ran fine until the temp started to rise again.

The other day I reversed the polarity on the pump to try and purge the filters and test rode it. Took a little while, but again similar situation, but not as extreme as before. I also was down on fuel. I finally had a chance to refill and didn't happen the remainder of the short ride back home.

I wonder if it's something similar to what you're experiencing and not running lean, but pump is running hot and kind of vapor locking? Or filter issues? Guate city dealership does not have filters or pump in stock to find out if that's the cure.

Any thoughts from the orange gurus??
what car?? is offline   Reply With Quote
Old 04-10-2013, 09:56 AM   #5
pdxmotorhead
Studly Adventurer
 
pdxmotorhead's Avatar
 
Joined: Mar 2012
Location: Portland OR
Oddometer: 707
Sounds exactly like a fuel pickup issue, and,, if your inlet sock is plugged you will overheat the pump which makes it worse.. This is based on my EFI experience, not KTM experience..

Once the engine goes lean its going to heat up worse,, and then the problem spirals downward.. As the lean engine symptoms distract from the real problem.

If the dealer cant help you,, see if you can track down a decent sports car or bike race tuner (Track/Road racing not ricer drag action) They can hook up to the engine with their gear and see whats working and whats not.. a couple hundred spent on someone who knows there stuff is cheap compared to a gorilla throwing parts at it..

Bad injector will cause hot pipes as well, but normally that should throw a code..

Cheers
Dave
__________________
Freedom is a delicate thing.
More easily lost than gained.
pdxmotorhead is online now   Reply With Quote
Old 04-10-2013, 11:29 PM   #6
gefr
Life is a trip
 
gefr's Avatar
 
Joined: Nov 2005
Location: East Med, Greece
Oddometer: 3,815
I had similar issues on my 990Adv.

In hot weather only, the bike bogging and dying. Struggled with that for a while. Fresh fuel cools the fuel down and runs better for a while. I finally left it in a dealer. He installed a pressure gauge in the fuel line and diagnosed a failing fuel pump. I believe you have the same issue.
Cheers.
gefr is offline   Reply With Quote
Old 04-11-2013, 04:48 AM   #7
Tardis OP
Tardis
 
Joined: Apr 2013
Location: Melbourne
Oddometer: 2
Thanks very much for that. I gather then that the fuel pumps are a weak point with the 990adv ... Earlier in my relationship I had a high rpm misfire that the dealer said was a blocked fuel filter and thus not warranty ... It cost me several hundred dollars and some perplexity at the time and thus money it took for the dealer to diagnose.
For the life of me I cannot understand why a vehicle of this nature has the pump and fuel filter hidden inside the fuel tank in such an unserviceable fashion ... Pain ...
Tardis is offline   Reply With Quote
Old 04-11-2013, 04:00 PM   #8
TcRulz
Gnarly Adventurer
 
Joined: Dec 2010
Location: Home of all things fridgid - Bathurst.
Oddometer: 289
Hi Tardis, 990's have a bad reputation for blocking filters. Dalby moto in QLD sell a efi filter purge kit that reverse the pump and pumps fuel backwards, cleaning the filter. They have a legendary reputation in Oz so might pay to give them a call.
TcRulz is offline   Reply With Quote
Old 04-11-2013, 05:37 PM   #9
gefr
Life is a trip
 
gefr's Avatar
 
Joined: Nov 2005
Location: East Med, Greece
Oddometer: 3,815
The fp is placed inside the fuel tank to cool off.

It also has to be as low as possible to use the whole of the tank capacity, so there you go.
Cheers.
gefr is offline   Reply With Quote
Old 04-11-2013, 05:43 PM   #10
pdxmotorhead
Studly Adventurer
 
pdxmotorhead's Avatar
 
Joined: Mar 2012
Location: Portland OR
Oddometer: 707
Having the pump immersed in the fuel keep it cool, unfortunately it heats the fuel up..

Pretty much all cars now have the same setup...

Dave
__________________
Freedom is a delicate thing.
More easily lost than gained.
pdxmotorhead is online now   Reply With Quote
Old 04-12-2013, 01:49 PM   #11
what car??
down the road
 
Joined: Dec 2010
Location: Colorado
Oddometer: 370
I kind of wondered when I might have this issue act up on me. Didn't bring extra provisions with me. Damn the luck!


Having the pump immersed in the fuel keep it cool, unfortunately it heats the fuel up..

Pretty much all cars now have the same setup...

Dave


Actually the pump is not hard to get to or remove. Try a full tank of fuel and replacing the pump on a truck or car without the use of proper jacks or shop to do it in. . Good stuff for sure.

Looking forward to getting her back on track without the hiccups. Great sight and useful/helpful tips and advice...
what car?? is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 08:26 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014