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Join the dots

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by robmc52, Aug 11, 2019.

  1. robmc52

    robmc52 Senior Member

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    Evening all, 2 little problems today with my W220.
    Engine cuts out as the car is coming to a standstill, foot on brake pedal, into neutral, turn the key and it starts straight away, runs smoothly as usual. It did this on 2 separate occasions today, during a 200 mile journey.
    After the second cut out, engaging cruise control brings up 'Speedtronic/limiter visit workshop!' on the display, never seen that before.
    So my question is, coincidence or connected? Trawling through some old threads has brought up brake light switch, or CPS, but I'm unsure where to start.
    I do have a new CPS in the boot...
     
  2. LostKiwi

    LostKiwi Senior Member

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    A star session will remove the guesswork. I doubt it's CPS.
     
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  3. M80

    M80 Senior Member

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    The CPS is known to cause the engine to cut while running, then not restart till the engine has cooled some.
    This doesn't sound like that.
     
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  4. OP
    robmc52

    robmc52 Senior Member

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    Well it's been on Star and there are no obvious pointers to why it would cut out. The man has erased what codes there were, so now the wait begins for it to reoccur...
     
  5. Wighty

    Wighty Senior Member

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    Well , if you have a cps in the boot , why not fit it and buy a £12 brake stop switch anyway , after all both items have a lifespan anyway ?
     
  6. OP
    robmc52

    robmc52 Senior Member

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    That's a good point, Wighty, although I'm not double jointed so actually getting to the cps could be a problem, might have to send a 10 year old in there...
    It's been running fine today, the speedtronic warning has now disappeared, and the cruise control is working fine.
     
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  7. Wighty

    Wighty Senior Member

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    I'm sure given long enough , even you would have thought of it buddy :rolleyes::D
     
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  8. OP
    robmc52

    robmc52 Senior Member

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    Well it cut out again earlier, idling in traffic, for a brief moment the battery warning came up on the display as it stopped. Started straight up when I turned the key.
    I checked the battery condition and it's charging at 14.2 volts. My 'man' says the engine shouldn't cut out if the battery or alternator warnings come up, so it's all very random.
     
  9. Blobcat

    Blobcat Moderator

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    Have you had it on “Star” as yet?
     
  10. LostKiwi

    LostKiwi Senior Member

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    Do you have a lot of keys on your key ring or a heavy key ring fob?
     
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  11. Blobcat

    Blobcat Moderator

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    Good call, there was an ML on here that cut out because of overweight on the key
     
  12. OP
    robmc52

    robmc52 Senior Member

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    Yes, it's been on Star (post number 4) with nothing obvious to report.
    The man suggested wiggling the key about, which I tried on a deserted bit of the M2 yesterday, but couldn't replicate the problem.
    So far, it's only cut out when at idle, or slowing to a halt. I've done 250 miles today and apart from the cut out with the battery warning message, as above post, it's been running absolutely fine.
    I wonder if it's possible that the battery could be on the way out, even if it's taking the correct charge. There's plenty of posts on the forum about random error messages and strange electrical behavior which a battery change has cured. I'll have a look and see how old it is I think.
     
  13. OP
    robmc52

    robmc52 Senior Member

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    Well, I can't see a date on the battery,

    20190813_200151.jpg

    terminals are nice and tight, unless the posts need a scrub :geek:

    The little window is green...
     
  14. M80

    M80 Senior Member

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    Get a plug in volt meter (for the cig lighter). Assuming it's possible to see the volt meter easily and the battery fails to take charge you would see a spike in the charge voltage, 16 volts wouldn't be a surprise in that scenario, it not beeing soaked down by the battery.

    But I doubt it.

    More likely an intermittant broken connection to a sensor, like the CPS for instance. But then I would assume a latching code on Star would show.
    Or I guess a similar broken connection within the key or EIS. Have you tried the spare key?
     
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  15. OP
    robmc52

    robmc52 Senior Member

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    What spare key? :D Actually, my man did mention the EIS, but said none of the one's he's ever changed has had the same problem that I have here!
     
  16. OP
    robmc52

    robmc52 Senior Member

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    I noticed something interesting today, an error message came up on the display, something to do with the airmatic, just for a second. After it had disappeared the cruise control wouldn't work, the same message as the other day, 'speedtronic visit workshop'
    However, I was doing 50 mph at the time, and the engine didn't cut out like it has done when it's been idling previously.
    There's no malfunctions coming up when any of this happens, and no warning beep either, so it's just pure luck whether I'm looking at the display when it happens.
    Also, the navi drive, telephone, and radio have all started to cut out occasionally as well, though I realise this can happen anyway as a separate problem.
     
  17. Tony Dyson

    Tony Dyson Senior Member

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    There will be a Date somewhere, the image isn't clear but what details are there on the ticket wrapped around the Negative lead? it may be stamped on the Positive Lead Post or on a sticker on one of the side walls so you will need to remove the battery to look. Have you taken any resting voltage readings from the battery?

    ETA, I have a suspicion this is the wrong specification battery for your car, it is a Silver Calcium, Gel Filled Lead Acid SMF which requires a higher charging voltage than you measured at 14.2, it should be 14.4-14.8 for this specification battery, I suggest you confirm the design specification battery for your car first before you spend any more money, you could input your reg mark on a couple of battery suppliers websites such as Tayna, Eurocarparts, Varta or Bosch and see what they recommend?
     
    Last edited: Aug 14, 2019
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  18. Blobcat

    Blobcat Moderator

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    Poor earth somewhere or water in some electrics?
     
  19. joderest

    joderest Senior Member

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    see if battery has a resting voltage of 12.7 ish volts
     
  20. OP
    robmc52

    robmc52 Senior Member

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    The resting voltage is 12.2 volts
     

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