Sent wife's pulse through the roof!

Discussion in 'General Discussion' started by stevieb15, Feb 1, 2012.

  1. stevieb15

    stevieb15 Active Member

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    My wife had a major event on the M25 in her 2004 320 CLK when it stalled/engine suddenly stopped without any warning.
    Jayne was in the outside lane, keeping up with traffic, so 75-80, when all of a sudden she was powerless, she managed to drift across from lane to lane with much flashing of lights and horns going off all around and very badly shaken up!
    An error message just advised visit workshop, after 5 minutes she restarted it and the "no malfunction" message came up, so she drove to Jct 9, staying in the inside lane and down the A24 towards home, when the same thing happened again.
    She contacted the excellent John Haynes who told her to bring it straight in, provided her with a courtesy car and sorted the problem within 24 hours.
    It turned out to be the HFM sensor which was replaced along with the air filter.
    Anyone heard of anything similar happening before?
     
  2. brucemillar

    brucemillar MB Enthusiast

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    Same thing happened to my wife on the M2 in morning rush hour (documented elsewhere on here). In her case it was the fuel filter that had become blocked after fill up at the local ASDA. Not heard of an HFM sensor?

    I'm glad to hear that your wife is OK.
     
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  3. MicB

    MicB MB Enthusiast

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    BHF.....frightening.....pleased a good outcome.

    Mic
     
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  4. Stratman

    Stratman MB Enthusiast

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    Terrifying, glad she kept her head and was safe.

    I had the opposite happen many years ago. I had a 4.2L XJ6, which I was driving along the North Circular in the Neasden area, where there are some quite tight bends. I floored it into kickdown to clear some traffic, and when I took my foot off the pedal it stayed firmly stuck to the floor :eek:

    I kicked the pedal in all directions, all the while the speed was rising rapidly. A 4.2 Jag in kickdown can get a bit of a wiggle on. Eventually the pedal popped up and I avoided more tham half throttle for the rest of the journey. Luckily the leather seats were wipe clean.

    The problem was the rod off the accelerator pedal had wedged itself behind the head of a bolt which acts as an end stop.

    Scary doesn't start to describe it.
     
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  5. Adam230K

    Adam230K MB Enthusiast

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    The only sensor I can think of that would kill an engine like that is the crank position sensor...

    My only guess is that the HFM sensor is referring to the air mass meter... I've never heard of it being the cause of an engine stalling but I may be wrong.
     
  6. abecketts

    abecketts MB Enthusiast

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    I had that experience in a Mitsubishi shogun on the M40, the fuel pump failed whilst i was in the outside lane, manoeuvring a 2 tonne automatic across three lanes with no power is an experience i'd rather not repeat. I hope your Wife is ok.
     
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  7. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    whats a HFM sensor?

    I can only think of a few things that would cause this.

    Faulty Key
    Faulty Ignition Module/barrell
    CPS
    Loose connection to main earth or pos somewhere
    Front SAM unit,
     
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  8. SPX

    SPX MB Club Veteran

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    I hope your wife's ok Stevie, she deserves a medal for negotiating that nightmare.
     
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  9. OP
    OP
    stevieb15

    stevieb15 Active Member

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    Hot film mass air flow sensor, it's a part of the engine management system
     
  10. OP
    OP
    stevieb15

    stevieb15 Active Member

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    Thanks Lee, plenty think she deserved a medal long before this little incident!
    Your daughter fully recovered now?
     
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  11. SPX

    SPX MB Club Veteran

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    Yes thanks pal, her first day back at school was Tuesday and she's settled back in easily.
     
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  12. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    Ok im well aware of the MAF sensor "mass air flow" but that didn't cause your problem I can guarantee you.
     
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  13. olderbutnotwise

    olderbutnotwise New Member

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    Similar to my father's experience.
    Family driving down from Oban in Simca 1301 special ( hello . . is anyone still there ? ).
    Came to a sharp bend and just took his foot off accelerator to lose speed.
    The car kept at the same speed however, and we just made it round.
    Turned out a gromet in the bulkhead was missing, and the accelerator cable had been rubbing
    metal to metal all it's life. Eventually, the cable started to fray, which in turn caught on the bulkhead, leaving the throttle stuck in position.

    very scarey, but as you say, wipe clean seats were a godsend ( although plastic in this case ). :crazy:
     
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