The old girl doesn't want to rev?

Discussion in 'Engine' started by SL Happy, Jun 7, 2011.

  1. SL Happy

    SL Happy New Member

    Messages:
    6
    Joined:
    Jun 7, 2011
    Car:
    SL320
    With the recent blips of nice weather to enjoy I un-wrapped the old girl (98) R129 SL32O and took it out to clear her lungs but when it was time to give it the boot it didn't want to change smoothly at high revs. Tootling along.. just fine but at full throttle I got a back fire, bit of a delay then it held revs midrange for an un-nerving few seconds before stumbling through the other end only to think twice about slotting into top gear.


    I would be grateful for any ideas anyone may have.

    Many thanks

    Ed
     
  2. Pontoneer

    Pontoneer MB Club Veteran

    Messages:
    11,155
    Joined:
    Aug 19, 2002
    Location:
    Ayrshire
    Car:
    '93 190E 2.3LE W201 ; '93 300SL-24 R129
    I am not sure if the R129 320 has the same M104 engine that is known to have issues with degradation of the insulation on the engine wiring loom ?

    The symptoms sound about right .
     
  3. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,446
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    Location:
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    Car:
    C43 AMG with a 55 engine and supercharger, E55 AMG, S500, etc
    It could be a V6. It also could be an air mass issue too.
     
    1 person likes this.
  4. OP
    OP
    SL Happy

    SL Happy New Member

    Messages:
    6
    Joined:
    Jun 7, 2011
    Car:
    SL320
    doesn't sound too good? it's the last of the 4 gear engines I think. is it a fixable thing?

    Thanks for your help
     
  5. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
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    Location:
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    Car:
    C43 AMG with a 55 engine and supercharger, E55 AMG, S500, etc
    It needs to go on a Star diag machine to check the fault codes and live data. An air mass sensor is about £150 if you have a V6 and that is the cause of your problem
     
  6. OP
    OP
    SL Happy

    SL Happy New Member

    Messages:
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    Joined:
    Jun 7, 2011
    Car:
    SL320
    Normally the case I guess, thanks for the posts and we'll see what the box says when its in.


    Cheers
     
  7. Highlnder

    Highlnder New Member

    Messages:
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    Aug 16, 2011
    Location:
    Central Scotland
    Car:
    SL 320 R129 & C180K W204
    Hi, was just wondering what the result was of your findings>?

    Regards
     
  8. kth286

    kth286 Hardcore MB Enthusiast

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    Perhaps it was in limp mode due to an earlier fault.
     

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