1987 w124 300 TE starts, runs for seconds only

Discussion in 'Engine' started by 300_te, Aug 29, 2011.

  1. 300_te

    300_te New Member

    Messages:
    4
    Joined:
    Aug 29, 2011
    Car:
    w124 300te
    Hello there,

    I'm a new member asking a question on behalf on my dad, who's got a 1987 'D' w124 300 TE.

    Today the car would start as normal, but only run for a few seconds before cutting out - enough to get it half the way down the road, where it now resides.

    The rev counter would stick and perform rather strangely, but there didn't seem to show any other odd symptoms.

    The car has idled more lumpy lately apparently but not cut out previously, but now it just dies after about 10 seconds.

    If anyone's got any ideas of what to check / do / look for we'd be incredibly grateful as the thing's stuck down the road- apparently the ABS light hasn't been on so does that rule out OVP stuff? (I once had a w126 that had OVP issues).

    Thanks in advance for any assistance!
     
  2. 300CE

    300CE MB Enthusiast

    Messages:
    1,475
    Joined:
    Apr 25, 2010
    Location:
    Sidcup, Kent
    Car:
    1990 300CE
    Hi 300te, do you know when it was last serviced as I'd start by checking & cleaning the plugs & the dizzy cap first (give it a wipe inside). I'm afraid that's about as far as my technical ability goes & I'm sure one of the helpful chaps will be along to give more advice. Good luck & give an update once you resolved it!
     
  3. OP
    OP
    300_te

    300_te New Member

    Messages:
    4
    Joined:
    Aug 29, 2011
    Car:
    w124 300te
    Hi 300CE - thanks for the response - think it was serviced recently! but will check dizzy and plugs...I have a feeling it's something electrical, but could be wrong!
     
  4. GP801

    GP801 MB Enthusiast

    Messages:
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    Joined:
    Jun 18, 2010
    Location:
    Sussex and Tuscany
    Car:
    2003 W209 CLK, 2005 R171 SLK in UK, 1995 S124 E280 in Italy
    OVP relay is involved in al sorts of things but do check the distributor cap. We had one go on a 300e-24. Had a minute crack in it. I was told it was quite a common issue
     
  5. Ian B Walker

    Ian B Walker MB Enthusiast

    Messages:
    7,672
    Joined:
    Jun 7, 2003
    Location:
    Freckleton
    Car:
    300-24, saloon and coupe, E300 24 valve diesel estate
    The clue is in the rev counter as GP's post. OVP relay.
     
  6. OP
    OP
    300_te

    300_te New Member

    Messages:
    4
    Joined:
    Aug 29, 2011
    Car:
    w124 300te
    Ahh, thanks for all the posts! Very helpful indeed.

    I'll check the OVP relay - is it near the battery on these? Is it likely to be a case of just popping a new one in and away we go?

    Thanks again.
     
  7. Ian B Walker

    Ian B Walker MB Enthusiast

    Messages:
    7,672
    Joined:
    Jun 7, 2003
    Location:
    Freckleton
    Car:
    300-24, saloon and coupe, E300 24 valve diesel estate
    Check the 10amp fuse in the top of it first. If it has not blown see if you could borrow one from a friend etc. and see if it solves the problem. If it does you have two options. One is to take it to pieces and examine the soldered joints and two, purchase a new one. It is situated next to the ECU behind the battery. Sometimes covered with a black plastic sleeve.
     
    2 people like this.
  8. OP
    OP
    300_te

    300_te New Member

    Messages:
    4
    Joined:
    Aug 29, 2011
    Car:
    w124 300te
    Brilliant! Thanks very much! Replaced the 10 amp fuse and it seems now to run as it should! Really appreciate the great advice - and speed of it!

    Is the OVP relay a common thing? That's twice i've encountered them doing odd things in Mercs! Great cars though - and a lovely sweet in-line six!...
     
    1 person likes this.
  9. GP801

    GP801 MB Enthusiast

    Messages:
    2,905
    Joined:
    Jun 18, 2010
    Location:
    Sussex and Tuscany
    Car:
    2003 W209 CLK, 2005 R171 SLK in UK, 1995 S124 E280 in Italy
    They are a common source of trouble. Caused fuel pump not to function on ours. A new one for ours was £80 from MB so worth it if its starting to give trouble
     

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