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Faulty Oil Pressure Sensor Again on Norge 8V?

Discussion in 'BNS12 Chat & Tech' started by CMD, Jul 13, 2020.

  1. CMD

    CMD Just got it firing!

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    Hi; seems the oil pressure sensor is a special subject on the Norge but why do I have intermittent error messages?

    Background is the original sensor on my 2013 Norge 8V broke (with corresponding oil leak and flat bed tow truck) and was replaced, however, the error message (Red light and Oil warning sign) keep coming back BUT only when the bike idles at red light or stop sign (after it warms up). On acceleration and during riding the error messages disappear. Dealer has ordered a replacement sensor but I still wonder whether this is a sensor problem or something more sinister?

    Opinions / Suggestions / Safe to ride long distance ???
    Thanks - Christian
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Since the engine is still running it probably isn't the oil pump. The oil pressure sensors are know to be problematic. Put in the new sensor and see how it goes.
     
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  3. Bill Hagan

    Bill Hagan GT Reference GT Famiglia

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    As an owner of an early firstgen Norge that suffered catastrophic engine failure when the oil pump fractured :banghead:, and who has also had the recurrence of the dash warnings (that scared me feceless :sweating:), I can assure you with near certainty that yours is, as John says, an OP sensor issue, and NOT, as you fear, "something more sinister."

    I am unaware of a single oil pump failure on a Norge with a build date after March 2007.

    Unless MG has improved the sensor connection since mine, this will recur. There are other, better connectors out there, at least for my '07.

    Safe for LD riding? Yup. That said, get it fixed as it appears you are.

    Best,

    Bill
     
  4. CMD

    CMD Just got it firing!

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    Thank you
     
  5. V700Steve

    V700Steve High Miler GT di Razza Pura

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    I agree also, just a $10 part. I put in the early one starting w/ GU17------. It has a post on top, same threads. Make a jumper wire to bullet connector. Why?, they seem to last longer.
     
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  6. Bert Remington

    Bert Remington Tuned and Synch'ed GT Famiglia

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    I'm thinking sump gasket failure. When MG went from the 4V to the 8V they increased some oil gallery diameters without increasing the surrounding mating surfaces resulting in oil escaping through gasket weak points.

    Are you observing more cam chain and valve train rattles at idle than before (yeah I know they're noisy -- mine is a 2012)?
     
  7. CMD

    CMD Just got it firing!

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    Update as at July 25th
    Just back from a 500km ride today and the problematic warning lights still come on at low speeds or at stops only to disappear when one sets off. No oil leak anywhere and engine was running fine all day making the same 'old' Guzzi sound. Faulty sensor I reckon.
     
  8. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    My 2012 is doing the same thing. It seems to do it more when it's very hot and not at all when it's cool. If I raise the revs slightly above idle the light goes off.
     
  9. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Low pressure light may be coming on because the oil is thinning in the heat out thus the pressure is lower. What weight oil are you using and how long has it been in the bike?
     
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  10. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    I'm using the correct Motul 10W60 synthetic. I'm coming up on an oil change. It's been a year and close to 10,000 km. Perhaps I should go ahead and change it. We have another month or so of hot weather before the slow ease into fall begins.
     
  11. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Yes do change it and the filter. Some studies have shown that 10W60 breaks down (loses viscosity) quicker than a 15W50 oil. Please let us know if the low pressure light continues to go on, or not, with the fresh oil. It may be that for these engines that get hot the service interval should be shorter.
     
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  12. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    I will do that.
    I just checked and the oil was last changed Aug.18/19. I've gone only 6,500 km but for the price of a fluid change it's worth it in the name of science.
     
    Last edited: Jul 28, 2020
  13. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    I ordered my oil and filter at 6:00 am Wednesday and it arrived at 11:00 am Thursday. Great service from Fortnine out of Montreal. I changed the oil and filter and CARC and transmission oil. I went for a "spirited" ride this morning and the light flickered for a second when I pulled in my driveway but did not stay on. The temperature was only about 20 C. I'll have to try it out when the mercury rises.

    P.S. I used Motul Gear Box 80W90 with moly in the CARC and tranny. It's slicker than snot on a rooster's beak!
     
    Last edited: Aug 2, 2020 at 12:53 PM
  14. Fiat500

    Fiat500 Cruisin' Guzzisti

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    So you have a new sender, oil and filter. Unless its a faulty pump or relief valve i would be going with Bert Remingtons suggestion and checking out both sump gaskets.
    Friend went through the same fixes as you have but it turned out to be a blown gasket around one of the oil way passages.
    When my sensor failed it did not show a problem only at idle hot or cold but could come on anytime usually when I turned on the key before start up.
     
  15. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    I don't have a new sender (pressure sensor). I may change it if it seems necessary.
     
  16. karlsguzzi

    karlsguzzi Just got it firing!

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    I’ve just had my sensor replaced and now find I have the same problem ie light coming on when oil is hot but going off as soon as I rev it. Am I understanding this right that some of you are riding round with this “problem” after having Replaced the sensor, and not worrying about it?
     
  17. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    How old is the oil?
     
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  18. Bill Hagan

    Bill Hagan GT Reference GT Famiglia

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    Yes ... BUT.

    Bear in mind that mine is a(n early) 2007 Norge that had the infamous oil-pump fiasco. Yours is an 8v.

    I knew that my subsequent red-light was only OP sensor.

    First, I never got the "Aladdin's lamp" icon other than with the engine seizure, but only the red light and OP sensor error code when checked.

    Moreover, I went through about three OP sensors before I realized that those who said that the OEM connector was the issue. Changed out that and presto, no more red light.

    If I had an 8v -- and I do in my Griso, not my Norge -- I would be more concerned about other possible causes, e.g., the sump gasket mentioned elsewhere in this thread. I haven't had this issue with my Griso, but would check both the OP sensor connection and the sump gasket before riding.

    Bill
     
  19. Raven

    Raven Cruisin' Guzzisti GT Famiglia

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    Just an update, my light still comes on with fresh oil but much less often and goes off again quite quickly.
     
  20. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Thanks for letting us know. It seems these switches aren't responding to pressure like they should.
     

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