[W126 Coupe] hesitation on 560

[Thomas Oelsner]

Thanks for the the suggestions, Attila. I am recovering from surgery and am somewhat immobile. Hopefully in a week or so I will be up and about and can check these out. Re the idle speed solenoid, If I do find it is not working by disconnecting the wires, is it possible that it is not working due to it not getting signal? The reason I ask is that if disconnecting the wires leads one to the conclude it is not working, it would be important to know it is really the solenoid itself and not an electrical problem from elsewhere. 

Thanks for the offer to check it out but I am in California.
Tom
  ----- Original Message ----- 
  From: Attila 
  To: 'Mercedes Coupes Mailing Lists' 
  Sent: Monday, December 28, 2009 6:08 PM
  Subject: Re: [W126 Coupe] hesitation on 560


   

          Try first unplugging the wires to the idle speed solenoid.

          Middle of engine, below air cleaner, shiny, with 2 vacuum

          lines (about 1 inch around) going to it.  If your idle goes

          up, it works.  If it doesn't, plug wires back in, rap on it 

  with a screw-driver, a good 5 to 6 times.  See if idle changes.

  Next, rap on the OVP relay.  Small box on firewall, close

  to driver's side.  There are a few other wires you can dis-

  connect, but It's too complicated to explain in writing.  It

  could possibly be the EZl, or even the crank position sensor

  (green wire) being deteriorated.  If you are close to 

  Jacksonville, we can check it out.  Free. 

   


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  From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Thomas Oelsner
  Sent: Monday, December 28, 2009 6:35 PM
  To: Mercedes Coupes Mailing Lists
  Subject: Re: [W126 Coupe] hesitation on 560

   

  Hi Gary

  Where and what is the EZL? 

   

  And to all others who would like to chime in...I finally took the car in for a range of service items. New plugs, wires (rotor and cap just needed cleaning as they are fairly new), and the idle is still rough and almost stalled out when stepping on the gas (even when warm). Fuel pumps are good as well as the filter, compression looks good and everything looks good on their test equipment. He did say the cold start valve does not appear to be working when cold. But would this explain the stalling when warm? I am not sure if he checked all vacuum lines for clogs, breaks etc. He suggested the dealer look at it but if I can find a good shop in the bay area that has all the test equipment and codes AND knows these cars, that would be my preference.  The car is originally a TX car so not all local shops have the codes.

   

  Happy Holidays to all.

  Tom Oelsner 

    ----- Original Message ----- 

    From: Gary Ensor 

    To: mbcoupes at mbcoupes.com 

    Sent: Monday, November 02, 2009 9:54 AM

    Subject: [W126 Coupe] hesitation on 560

     

    Check the vacuum line going to the EZL to make sure it has vacuum and is not broken or pulled off the engine side.


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