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Dead Spot About 3000 RPM Under Light Load

Ignaciob

Ignaciob

Husqvarna
Pro Class
5,000 miles on my Strada. For the past 2000 miles I've notice a dead spot about 3000-3500 RPM--mostly when I'm cruising at a steady throttle position on surface streets in the 30-40 mph range. I don't notice it at higher RPM, higher speeds, or higher loads.

I added a Booster plug at about the 1,000 mile mark and didn't notice this phenomenon until about 2,000 miles later.

If I hold my hand still at 40 mph the bike will actually drop about 5 mph as if it's coasting and then seemingly surge intermittently back between 35 and 40. If I change the throttle position it will seemingly reset itself until I get back to that speed, load, or RPM.

I just did the canisterectomy last night and didn't notice a change.

My next thought is to disconnect the booster plug and see if it the condition changes.

Otherwise, I'm wondering if the Throttle Position Sensor may be acting up with a deadspot or something else might be going on. If I had to choose whether its RPM, speed, load, or throttle position...I'd guess throttle position first and load maybe second. Speed and RPM seem less consistent as I can change gears and still get it to happen...I think.

Any other diagnostic ideas?
 
Did you get the Vac line pluged ? I have the WK and I just flipped it to cold......all is good. You may need to get Mossed...The bikes are very lean.....I think I'm going to the eruption mod to a second temp sensor just to see what happens.
 
rww said:
Did you get the Vac line pluged ? You may need to get Mossed...The bikes are very lean.....
Click to expand...
As I noted, this issue precedes the canisterectomy and this issue did not change after the procedure. And yes, I did plug the vacuum line...there's not a vacuum leak from the canisterectomy.

I also had the the bike MOSSed when I first bought it in May and was fine from mile 0 to about 3000. I wouldn't think it needs to be MOSSed again.
 
I posted the below in another thread in reply to Ignaciob's post. And, Scutler, I notice this in all temps. It doesn't seem to matter whether hot or cold.

bluegopher said:
This is interesting to hear from another rider. I too have a "dead spot" slightly north of 3k after removing the canister, having it mossed and installing the Wuka. After each update or mod performed it seemed that the dead spot would decrease or almost disappear but then return. It seems to be back for good now and I'm just learning to live with it.
Click to expand...
 
The lean spot went almost away when cold in the summer but with the wk set on hot I could still feel the lean spot on cold ride off unless it was over 90. The WK set on cold seems to have handled this and so far works in 50 degree range. I did zip tie the temp bulb to a cable out in the air stream to keep the reading as cold as possible.
 
Scutler said:
Does this "dead spot" occur regardless of temperature? On cold days vs hot days or all conditions?
Click to expand...
While I first noticed it when it was about 100 degrees several months ago I wondered about temperature too. However, it seems the problem is same as my morning commutes have been now been dipping into the 60 degree range. As it cools down further I will keep an eye on it, but I don't *believe* it's temperature related at this point.

I also zip tied by Booster temperature probe in front of the radiator to try and get as pure an incoming air reading as possible.

I also don't believe it's a summer-winter fuel blend issue as the issue has carried through multiple seasons.

Finally, I'm running prescribed octane rated fuel ....Premium....which is 91 MOR at my altitude.
 
My bike does it too, hot or cold. This bike just hates running at 3500 rpms. Only solution I've found is to ride in a lower gear and keep the rpms higher.
 
I've tried 2 different " foolers"...the original Booster Plug and the IICE air. The BP lowers the inlet air temp by 40 degrees. The IICE air was only about half that at its highest adjustment. the BP I have transformed my TR and gone is the flat spot @ light throttle cruising speed around 3.5K I also installed a 15 tooth countershaft sprocket. The TR is AWAKE now...it really is better. Those two mods are quite effective. I've bought into a bunch of "smoke & mirrors" in the past trying to go faster and get better throttle response. These two work on the TR. it'll still cruise just fine @ 75 mph or so..(sans weave) lol that's another thread!
 
Good to hear that works for you. Mine also has a flat spot around that rpm. I thought it was temperature related. I've just learned to live with it.
:cheers:
 
Ignaciob said:
While I first noticed it when it was about 100 degrees several months ago I wondered about temperature too. However, it seems the problem is same as my morning commutes have been now been dipping into the 60 degree range. As it cools down further I will keep an eye on it, but I don't *believe* it's temperature related at this point.

I also zip tied by Booster temperature probe in front of the radiator to try and get as pure an incoming air reading as possible.

I also don't believe it's a summer-winter fuel blend issue as the issue has carried through multiple seasons.

Finally, I'm running prescribed octane rated fuel ....Premium....which is 91 MOR at my altitude.
Click to expand...


Ya know I had not thought about it.... but I run 91 E free from pac pride. The E 10 gas does lean the mix..... M2C
 
Have you tried a 10 minute tune up? Mine did this about 2 months into booster plug life. I did the 10 minute tune up... start the bike and let it idle (no throttle) all the way up to the fan kicking on. Then let it run 2-3 fan cycles. This seemed to help for me... could just be the gas:excuseme:
 
Mine started this yesterday afternoon just after I filled the tank at an Arco Station and did it all the way to work this morning. I'll have to see what happens after my next fill up I guess.
 
Mine started this yesterday afternoon just after I filled the tank at an Arco Station and did it all the way to work this morning. I'll have to see what happens after my next fill up I guess.
Click to expand...

So I re-fueled at a Shell station on Friday 9/27 and noticed improvement almost immediately. Still not 100% but much better for sure.
 
It's not a fuel source issue for me. It's happening whether I use Chevron, Shell, Conoco, Exxon, Arco or others in the community I live and communities as far as 600 miles from here. I even had half a dozen times this weekend that while at 55 mph under moderate load it would cough for a split second and drop power. Something intermittent that seems to be getting more frequent and slightly worse in severity.

I can't tell for sure, but it may be more frequent in the last half of a fuel tank than the first half of a tank. With that I wondered if I had a plugged vent line, but pulled over, popped the cap, and no vacuum.
 
My TR has the same issue. No MOSS update yet because my local dealer does not know what file to use however the tech did richen it up. That helped but the dead spot was still there. The main difference I notice in fuel is fuel milage. I noticed some change with the outside temp and I started noticing a pattern in the air cleaner temp and outside temp. The air box temp is at least 10-25 degrees higher then ambient. This changes according to speed. I am going to wrap my exhaust pipe and heat sheld the air box and fuel tank.

My ass and thigh were getting hot and when I found out the converters were in the front of the muffers I quickly air chiseled them out. I was just looking to get away from the heat. I am not saying the de-catting fiixed the dead spot problem but I have not noticed it since. I have put about 500 miles on the bike since butt the temps have been cooler.
 
I don't have a BP or Wuka yet, still a slight hesitation/stumble from take off. But since the valve adjustment the flat spot around 3500rpm has improved dramatically!
 
OK, let me explain my situation - I have the exact same flat spot between 2500-3500 rpm and it's annoying as the bike feels like it is going to stall at every street light/stop sign unless I rev it up significantly. After reading all of the comments on this site, I decided I need a MOSS injection ;-) and set out to locate one. Well, my dealer had returned this to BMW so my alternative(s) were to 1.) Take the bike to a shop with a miss tool (nearest to me in the Denver area) or have my dealer here in Albuquerque remove the ECU, dashboard etc and send it to Husqvarna in So. California which is the route I took. Unfortunately, it took three weeks to get my bike back and it still has the exact same flat spot except now, it is more difficult to start (much like needing to put on a choke) and the idle is rough. Once underway and above the flat spot, it runs like a scalded cat and I love it. I now tend to think it may be something else entirely. I need to ride a few friend's bikes to see if theirs feels different - maybe a 'seat-of-the-pants' test will help confirm that there really is an issue and that I'm not nuts!:cheers:
 
Well, it's official. Nothing gets rid of this for me. I installed the Wuka, let it idle for three minutes to reset, then took it for a ride. I was so disappointed to find out the stalling/stumbling issue was still there, on both settings. No one else seems to still have the problem after installation. The Wuka is adjusting the temp on the dash as it should.

So I thought, maybe I shouldn't have done the idle/ecu reset with the Wuka on, so I reconnected the OEM sensor, did the idle thing, then shut down the bike and reconnected the Wuka and went for a ride immediately. Problem still there. Devastated!

The only thing I can think of now is try to get my dealer to moss it again next service. I asked them about the moss at its first service and they told me they put it on the moss. Not sure if they know what they're doing though. I deliberately left the Wuka install until after the service, as to not affect the moss.

I'm really at a loss with where to go next. So frustrating!

P.S: I forgot to mention that by bike is the restricted version with the throttle restrictor. But I don't think this should make any difference.
 
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