fuel pump, TPS or what??? - Page 2

Dw1 · May 31st, 2019, 03:08 AM

So I have read through the forum a bit, obviously the pumps are an issue with the 09-11 Bergs.
Looks like mine is doing the same as above. I am not sure what ended up being the issue though reading this thread. I suppose I am hoping for confirmation before I take the dive and replace the pump.

To clarify, my bike runs fine when cold, runs fine on the highway, plenty of power. Starts to kick, miss and carry on and stall while in town or idling warm. After stalling it will fire straight back up, give it a minute and it starts farting again. Only seems to stall and miss when off the throttle or on initial throttle and a little load. Must definitely be heat related because as soon as I get back to 100 klicks on the highway (plenty of air) it comes good.

I have had similar issues in the past on my ktms when it has been the plug cap, but they have kept failing even out on the open road.

So am I up for a pump?

tourist · May 31st, 2019, 05:16 AM

I would try replacing the pump, yes. Given that they can be had at acceptable prices, the worst outcome is that you have a diagnostic item crossed out and a spare pump on the shelf. But the description is similar to cases where pump replacement has fixed things :)

BRod · June 3rd, 2019, 02:08 PM

I'm in the same boat and struggling with what to replace next. A brief history:
- 2010 FE570 purchased new in spring 2011. Ran great first year.
- 2012 after constant stalling and occasionally having to get pulled out of the woods, I replace the stock pump with CA Cycleworks. Also replaced tank filter. Ran perfect for maybe one year. Also installed Shorai battery for more cranking fun.
- 2013 problem came back but not quite as bad, re-start in 30 seconds of waiting versus 30 minutes (fun when the mosquitoes are in full force).
- 2014 added Zip-ty 10 micron filter in fuel line and sent injector off for professional cleaning. No improvement. Also adjusted TPS to 0.64 which made a huge improvement in cold starting, but not operation.
- 2015 went through every wire connection, cleaned and made sure connection was good and nothing grounding. Adjusted seemed to make an improvement, but only temporarily, then no difference.
- 2018 replaced ignition coil, spark plug cap and of course spark plug. No improvement.
- Two weeks ago riding with my son on some very easy stuff at low speed and cool weather, it died twice in 24 miles. Strange thing this time was the trip reset each time, indicating a power interruption.
- This Sunday raced my first enduro. Ran great until mile 14.8 then it died for maybe 15 seconds. Again at 15.3 miles, then 16.3, then 17.3, then not until around 21 miles. This repeated every 1-3 miles (tight woods, 2nd sometimes 3rd gear, maybe 65 degrees F). Finally at around 30 miles when it died it would not restart for maybe 5 minutes. After four of those I decided to go back to camp and not finish the last 12 miles of the race. BTW the trip never reset, so WTF?

In my head, if it's not the pump (again), is the power to the pump or the injector being compromised? Or is it loss of spark (replaced all those components already)?

If anyone finds a solution, PLEASE post up!

TIA
Brian

Rainerio · June 3rd, 2019, 07:27 PM

BRod see if your fuel cap is working good if you have any doubt remove the bearing. You ever know.

Dw1 · June 8th, 2019, 03:38 AM

Well I fixed mine. Incredibly embarrassing. I undertook several tests including testing my fuel pressure hot and cold, plug cap resistance hot and cold, valve clearances ect.
Turned out to be a hair line crack in the ceramic of the spark plug.
I am happy I didn't go spending to much money on injectors and fuel pumps ect.
This may or may not help others. I just thought I should post it up in case someone had similar symptoms.
(Remember mine started straight away after stalling)

Dw1 · June 8th, 2019, 04:02 AM

Brod, Have you checked the valve clearances? Yours sounds more like that or fuel vaporisation in the fact that it won't start back up straight away, or air lock as mentioned with checking the cap above.

I would check your fuel pressure hot and cold if possible before you go for a pump.

BRod · June 9th, 2019, 06:04 AM

Originally Posted by Dw1

Brod, Have you checked the valve clearances? Yours sounds more like that or fuel vaporisation in the fact that it won't start back up straight away, or air lock as mentioned with checking the cap above.

I would check your fuel pressure hot and cold if possible before you go for a pump.

I checked my valve clearances a few months ago and they're all in spec. Fuel vent is working fine too. I replaced the pump yesterday with a new CA Cycleworks (under warranty) pump. Calling for rain today so no riding but hopefully will get a chance to thoroughly test next weekend. Will post results.