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Throttle Body trouble

Discussion in 'Norton Motorcycles (Modern)' started by Bluedog 55, May 27, 2016.

  1. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    This sounds strange to me but apparently it's the case.
    My bike was coming due for its annual service so I did an 1800 km road trip basically without a hitch the bike ran great.
    I take it in for service and breather upgrade so the oil no longer collects in the air box
    Pick up the bike seems to be idling a bit high but I set off on the 200km trip home anyway
    Stop half way bikes revving at 2400 and having trouble settling it was too late in the day to return so I continue home
    Bike is still idling at 2400 when hot but will settle back to 1200 after a minute or so
    Starting off cold idles fine but soon as hot back up again and hanging badly
    I take the bike back the do a firm ware test and tell me throttle bodies are not talking to ECU needs new bodies
    Apparently order is going in today but I can't work out why the bike was fine before the The service and after the work it's like that? Any thoughts would be appreciated
     
  2. BritTwit

    BritTwit

    Joined:
    Aug 25, 2009
    Did the dealer say it was a problem with the throttle position sensor?
    I would think that it could be replaced with the throttle bodies in place on the bike.
     
  3. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    What pipes are you running with which mapping? I had the same problem. Go to PM.
     
  4. NortonFactoryUK

    NortonFactoryUK VIP MEMBER

    Joined:
    Sep 28, 2015

    Hi Bluedog,

    Please can you let me know via PM which dealer carried out your service. The high idle you talk of is NOT related to the TPS sensor, it is purely too much air entering the engine when you shut off the throttle, it can happen for a number of reasons, but obviously it is not supposed to.

    Simon
     
  5. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Thanks for the replies and pm's they definitely said ecu not talking to throttle bodies, I'm running the after market long pipes with decat, mapping is current is as much info as I can get, thanks Simon for the reply I have pm' you hope we can get it sorted quickly and me back on the road.

    Cheers
     
  6. BPHORSEGUY

    BPHORSEGUY

    Joined:
    Nov 29, 2013
    Bluedog, I sent you a PM and if you would include your location in your sig it wold help us help you!!!
     
  7. Panetone

    Panetone

    Joined:
    Nov 1, 2015
    Hi,
    Please check this:
    under the throttle body is the "idle regulator" mounted. (the black thing)
    Please dismount it and the you can check it.
    The idle regulator must be connected to the electrical plug then turn on the ignition.
    The "idle regulator" must move, you can see it in the hole also you can hear it.
    When you turn off the ignition he must going back to the start-position.
    If he donĀ“t move change the regulator

    My bike was running always 2000 revs in idle, it was fixed after changing this one.

    Panetone
     
  8. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Thanks BPHORSEGUY I edited my profile I'm in NSW Australia , thanks panetone the bike is in Sydney at present so hopefully they will sort it but I will check that out when it comes back just to see where it is, the bike will be out of warranty in under a year and all the basic maintenance I'll do myself so it will be something that I can sort out myself should it give me trouble.
     
  9. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    I think it may have to do with the idle screw (which isn't actually the idle screw) like Simon said, too much air in the mix. I've fixed 4 bikes with the same symptoms. See my manual "Throttle Control - Norton 961". It may not be it for sure, but easy to try yourself. PS > Simon will chime in and say not to touch that screw. Hi Simon.. :wink:
     
  10. NortonFactoryUK

    NortonFactoryUK VIP MEMBER

    Joined:
    Sep 28, 2015
    Correct, I will. The "idle Screw" is set by our throttle manufactures using a vacuum gauge to ensure all throttle bodies are a known and correct value of air passing the butterflies. The job of the idle air stepper motor (hung under the throttle bodies) is to compensate for variances in engine tolerances, temp, baro pressure etc, to ensure a steady idle. Altering the throttle screw will affect the ECU's ability to correctly fuel the bike at low throttle openings.
     
  11. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    Maybe clean the idle stepper motor. I took mine apart and cleaned it with WD-40. Same manual shows how to do that. Could be sticking.
     
  12. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    Hi Simon.

    Thank you for chiming in. We appreciate your input.

    I have been having an intermittent problem opposite this discussion. The bike seems to take quite a long time to warm up. It will start right up, I'll let it idle for a few minutes before my ride, but she seems to idle at about 800 for a few miles and stall at stop lights. Usually its just a few miles, then it catches on and idles at 1150 steadily and runs great for the rest of the day. Once, it idles low for over 20 miles and stalled at every stop unless I held the throttle up to 1200 or so. That one was an annoyance. It happens more than not, but occasionally it doesn't happen at all. Is there a temp sensor that could be going on the fritz? Matt Capri at South Bay Norton said the EPA compliant ignition wires keep the bike from warming up quickly, but the problem is a new one. Currently have 5500 miles.
     
  13. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Thanks again all, the bike is still in the shop awaiting throttle bodies they assure me they have done all the test and that there is no air getting in anywhere, the ETA for the throttle bodies is unknown so I'm at thier mercy hopefully it won't be too long.
     
  14. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    I know you are on the opposite side of the planet, Bulldog, but Norton has been express mailing my parts once they new I was in distress. I think if they got wind of your problem back at the factory, they will help you out in a timely fashion. Call Stephen Green at Norton UK using the number on their website. He wasn't at his desk when I called and he called back in literally under 5 minutes, and I'm in the US. I hope it works out for you quickly.
     
  15. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Thanks for the tip Britfan I tried but he's at the TT's until Monday will try again then
     
  16. spannerhands

    spannerhands

    Joined:
    Sep 21, 2015
    I had a problem with the engine revving to around 2000 rpm in a similar way to that described when hot. It turned out that the throttle valve was not returning fully to the 'idle screw stop' when hot. It left around a 1 -0.5mm gap. This caused further problems when the bike was stopped and restarted as the throttle position sensor then recalibrated without the throttle fully closed.
    I adjusted the return cable on the throttle a little tighter so that if the engine revved I could pull the throttle shut which resolved it. After the first 1000 miles this stopped happening and so I assume that the bearings in the throttle body might have been a little tight.
    That's it enough typing I'm off to ride the bike :D
     
  17. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Thanks britfan60 I managed to get hold of Stephen Green and he was pretty helpful, they have been waiting on supply but said they should arrive here in Australia next Tuesday considering they won't get them until Friday this week.
    They will be getting the old ones back so hopefully for my own satisfaction I'll get to find out why this has occurred .
    I'd recommend ringing Steve to anyone that's not getting much from the dealer in relation to ETA of parts as at this afternoon they still were trying to find out.
     
  18. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Parts finally arrived a week late and now they say they are having trouble fitting the bike in due to scheduled servicing, I don't get it , not happy with our Aussie service at all
     
  19. GKRyder

    GKRyder VIP MEMBER

    Joined:
    Mar 20, 2016
    Hey Bluedog,

    Where are you getting the bike serviced?

    Mine has been at Frasers for 6 weeks waiting on parts but booked for recalls + service.
     
  20. Bluedog 55

    Bluedog 55

    Joined:
    Aug 3, 2015
    Hi GKRyder

    Yes mines there too Sydney is that where yours is at? Mine was in for 3 weeks for that but then came out with this problem I'll keep on to them hopefully they'll get sick of me pestering them at least my parts are there so hopefully very shortly I'll get it back I've asked for warranty extension which I think would be fair but it's falling on deaf ears, that's UK included , hope yours is going soon