te 450 08 throttle hesitation on acceleration & cut out

[addo]

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I purchased a Husqvarna 2008 TE 450 4 days ago in almost new condition, but had noticed a slight hesitation under hard acceleration, not thinking much of it I had a service carried out by the dealer as its carried out 555 miles and 27hrs from new. The dealer didn't picked up the hesitation but changed the oil, oil filter, spark plug, air filter, de-compression cable and the two exhaust shims as they were out of specification. So I went out on a ride yesterday as I'm planning a 100 mile trail on Sunday to make sure all was well.

It fired up well and for the first 4 miles no problem but the hesitation was there but not when you accelerated normally just under full bore. I then rode up a slight incline and the bike just stopped? i tried bumping it and using started motor but no joy. a friend drove out in his van and recovered it and i rolled it into the garage scratching my head. I went through the ignition sequence an noticed the fuel pump wasn't priming so stripped the tank down and noticed the earth was disconnected!

Here is the Fuel pump when i removed it, as you can see the earth black cable is off and the reserve sender has snapped off

 

[addo]

So i then re crimped on the earth wire firmly, tie wrapped the sender and final added another tie wrap to the fuel pump frame as I've read it can slip down causing a similar issue.

 

[addo]

I turned the ignition on and it primed straight away and then fired up instantly. I'll ride it tonight to check the hesitation as hopefully that was the earth switching the pump on and off and its no cured. I'm just glad it happened on the road and not on Sundays ride out.

 

[OlderHuskyRider]

I hope the ground was the fix you needed. The low fuel sender must have broken recently or the bike is not ridden too hard. When mine broke, it bounced around so much, it separated from the wires and I found it just laying/bouncing around in my tank. I threw it away.

 

[Arctra]

Hey mate. When you took your bike to the dealer did they hook it up to iBeat and recalibrate the TPS etc? If not, I suspect that's where your problem is. When I got my bike I struggled with similar bottom end bogging and it turned out the TPS was way off calibration, and the CO2 levels were wrong with the EFI too.

Good luck getting it sorted out.

 

[addo]

a quick update i rode it tonight and its still hesitating on acceleration so the pump fix didn't work! is there any manual adjustment that can be used?

thanks for the Ibeat detail is this a strictly dealer software?

 

[JasonfromMN]

You can buy ibeat through semco on here. You can't adjust co as stated above but the 08 do have a FB adjustment that can be made and TPS. Very good chance your TPS is off. If your dealer is close I'd have them do the (ibeat) TPS adjustment and get a JD fuel tuner to make it run real good.

 

[addo]

Guys can you explain what the TPS is and does please? so you don't think there is any manual adjustment on the 08? cheers

 

[Arctra]

TPS = Throttle Position Sensor

It is basically a potentiometer that gives different voltage readings based on where the throttle is positioned. I recall reading a thread on manually adjusting the TPS, but dunno what model it worked on. I think the iBeat reset is the only way for you to go.

 

[addo]

Arctra/jasonfromMN/olderhuskyrider thanks for the prompt informative replies, I'll discuss the TPS calibration with dealer today as I rode the bike over 130 miles yesterday and have to say it performed brilliantly and didn't really notice the hesitation until I was on wide open tracks. It will pull to about 81mph with the std gearing at the moment but the flat spots need sorting as if you need to pop a wheelie to help climb a tree root it will simply bog down and hesitate also flat out riding is miserable.

If the dealer configures the ecu and TPS correctly and solves the problem and i decide to get the power up kit a few months down the line would the bike need to be re-tune?

also I'm right in thinking it's just the following parts and can be obtained via the dealer?

1. Air filter skeleton (no-restrictive frame) housing
2. Straight through slip on pipe with out metal meshing
3. lamda/02 sensor cap off bolt

Are there any disadvantages with the power up kit? will it compromise reliability with starting/running or MOT testing?

thanks

 

[addo]

*Up date*

The bike went back to touratech today to get the TPS re-calibrated with the ECU, plugged it into the Husqvarna software not i-beat a newer software and then test rode it, initially it felt better but did a few flat out accelerations and it started hesitating again going into 3rd.

The software said it was already in race mode and the air filter has the skeleton frame so they are going to check the 02 sensor plug in loop to see it that's correct and the metal mesh in the exhaust to check for any resistance. failing that there are no error codes on the ecu so i'm not sure what else it could be? anybody have other ideas?

 

[addo]

Just spoke with the Mechanic and he confirmed the mesh had already been removed but the oxygen sensor was still plugged in, meaning all the hardware to make the power up kit were in ready but it was still using the active map rather than a fixed map "race mode" so he's fitted a te610 closed loop plug to de-activate the O2 sensor and hasn't noticed any hesitation so far. i think I'll head down for a test ride tomorrow.

 

[HUSKYnXJnWI]

Lots of stuff going on here- need verified info before making any solid assessments- Sounds like the dealer is sorting it out with you telling him what you want and is sorting the issues you found. This is good-

Ultimately though- since it was not in Power Up mode- I would expect you to find hesitation consistantly-and putting it into Power Up mode will sort alot of that out. You may still find smaller areas where adjustment can be made, but it won't be as much of a obvious hesitation or issue.

2008's are a little harder to tune with Ibeat- less to work with, compared to 09-10. The dealer is using IBeat- yes its probably a "newer" version, but its Ibeat. So these guys are discussing the same parameters that the Dealer is working with when discussing 2008 ecu's.

let us know how it does when you get it back.

 

[duggoey]

Maybe you addressed it with the last update, but:

Only hesitated once the trail opened up? These models had a history of dodgy temperature sensors didnt they?. Are you in a cooler climate? Maybe your thermostat is allowing too much coolant flow so is running rich when accellerating? What was the old spark plug like, much wet/dry fouling?

 

[duggoey]

Re

Maybe you addressed it with the last update, but:

Only hesitated once the trail opened up? These models had a history of dodgy temperature sensors didnt they?. Are you in a cooler climate? Maybe your thermostat is allowing too much coolant flow so is running rich when accellerating? What was the old spark plug like, much wet/dry fouling?

My point being if the temp. sensor is malfunctioning it might be allowing the bike to run too cool. It would sortof make the bike seem like the choke was always on..

You can get away with it in warmer/hot climates because you can just unplug it and allow the thermostat to stay open all of the time. Not if you are in any part of the US with low temps/snow etc.

 

[addo]

**UPDATE**

Right guys thanks for the replies, I test rode the bike at lunch time today and Wow what a difference! firstly it started instantly without any choke within a millisecond unlike the usually 0.7~ 1.3 second turn over, I let it warm up abit and gave it full bore and the front wheel lifted 1st, 2nd and 3rd! power was stronger, faster and more relentless giving the power a linear feel and the gears couldn't have come fast enough.

So it is now in full race mode with the fixed map not the active map with o2 sensor information. I'm now looking forward to the next ride out to test the new update

Thanks for contribution fellas

 

[addo]

Re

My point being if the temp. sensor is malfunctioning it might be allowing the bike to run too cool. It would sortof make the bike seem like the choke was always on..

You can get away with it in warmer/hot climates because you can just unplug it and allow the thermostat to stay open all of the time. Not if you are in any part of the US with low temps/snow etc.

Duggoey I'll keep an eye on the temperature and possibly change the pipe work to Samco with uptite Y splitter. I live in Wales in the UK and the temperature at the moment is 5 degrees.

 

[HUSKYnXJnWI]

Sweet! "front wheel lifted 1st, 2nd and 3rd! power was stronger, faster and more relentless giving the power a linear feel and the gears couldn't have come fast enough." Sounds about right!!!


Wait till you reach full VULGAR DISPLAY OF POWER MODE....

 

[OlderHuskyRider]

a quick update i rode it tonight and its still hesitating on acceleration so the pump fix didn't work! is there any manual adjustment that can be used?

Change the fuel filter, get an an all metal one, mine is 5/16" nipples on both end but I put all new fuel line in mine, i just replaced my first metal filter with this new one, at 6,000 miles.

 

[MChammer]

Are any special clamps or fuel line needed when replacing the filter and line since the whole thing is submerged in gasoline?