[W126 Coupe] Speedometer

[Dick Spellman]

I am using Bosch O2 Sensors found at this link 
<http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Oxygen-Sensor-Bosch_3486230-P_291_R|GRPEMISAMS_909569295___>
They are working properly for me.  One MB has 30k, another 40k miles and 
one other with 70k miles on it with the above sensor in use.  My notes 
show I purchased the O2 sensor (3-wire) with longer lead (the one in 
this link) so I could do the staggered soldered splice with heat shrink 
tubing up in the footwell.   Can't say if others have issues or if they 
fail prematurely as I only have the three MB's running with the above 
sensor and my mileage experience is somewhat limited.
You'll need a vacuum gauge with hose and fittings to locate the leak.  
There is a link to troubleshooting up on the web somewhere that 
illustrates how to isolate the vacuum groups on the MB engine.  Perhaps 
someone on the list can kick in the link.  I think it's Steve 
Botherton's(sp).
Dick

terrako at comcast.net wrote:

>

>

> Thanks Markus, any idea where I should began to look for the leak?  

> Would you happen to have any instructions on the O2 wireing and what 

> replacemt to obtain.

>

>  

>

> TS 

>

>

> ----- Original Message -----

> From: "Markus Meyer" <mfm at meyerprobateproperties.com>

> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

> Sent: Monday, April 13, 2009 9:52:47 AM GMT -05:00 US/Canada Eastern

> Subject: Re: [W126 Coupe] Speedometer

>

> I wonder if you developed a vacuum leak, sounds like a serious one if 

> pegged all the way to the right.

>  

> You can use a cheaper O2 sensor than stock, but it will mean some 

> minor rewiring as opposed to plug and play.

>  

> Markus Meyer

> mfm at meyerprobateproperties.com <mailto:mfm at meyerprobateproperties.com>

> www.meyerprobateproperties.com <http://www.meyerprobateproperties.com/>

> Meyer Probate & Properties, LLC

> 484-919-9762

>  

>

>  

>

>     -------- Original Message --------

>     Subject: Re: [W126 Coupe] Speedometer

>     From: terrako at comcast.net

>     Date: Mon, April 13, 2009 9:46 am

>     To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>

>

>     Hello, all.

>      

>     Can anyone assist? This weekend  the fuel economy meter stuck in

>     the red position, all the way to the right? Can anyone tell me

>     what the cuase and repaire for this is? Additionly my O2 light

>     comes on periodcally, poor gas milage as a result, is there an

>     option to replacing the O2 sensor with something other the

>     expensive MB part?

>      

>     TS

>

>

>     ----- Original Message -----

>     From: "THOMAS THEISEN" <tnstheisen at msn.com>

>     To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

>     Sent: Sunday, April 12, 2009 6:20:45 PM GMT -05:00 US/Canada Eastern

>     Subject: Re: [W126 Coupe] Speedometer

>

>     I just had my speedometer rebuilt by DNA Speedometers in Tampa,

>     cost $129. and works great

>     Tom 82 380 SEC

>

>         ----- Original Message -----

>         *From:* Mark La Rochelle <mailto:mark at burkhardtleitnerinc.com>

>         *To:* mbcoupes at mbcoupes.com <mailto:mbcoupes at mbcoupes.com>

>         *Sent:* Sunday, April 12, 2009 12:50 PM

>         *Subject:* [W126 Coupe] Speedometer

>

>         Hi,

>         The speedometer [and odometer] have started to cut in and out

>         intermittently. Going over a bump can make it work again. Does

>         anyone have any suggestions to fix the problem?

>         Also, is it normal to have a vacuum swoosh of air when you

>         remove the gas cap. Is the air pressure in the tank not

>         equalized in some way?

>

>          

>

>         Mark

>

>          

>

>         91 560SEC

>         The MB Coupes Website!

>         W126 SEC Mailing List

>         Postings remain property of MB Coupes, L.L.C.

>

>

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