[W126 Coupe] Speedometer

[Jonathan Hodgman]

Dick,

They 'work' OK from the drivers seat, but once you set up a stand alone wide
band a/f ratio gaugethey are not doing so well in the long term.
Mostly what I find is WOT is lean, and cruising is a bit on the rich side.
I don't have these problems when I run the correct O2.  Plus, O2'sfall off
gradually which makes it Difficult to discern any difference.

Jonathan

Blue Ridge Mercedes/AMG East
Offering Enthusiast Service, Restoration and Tuning.
Located in the Greater Atlanta area.
http://www.blueridgemb.com
404 805 1357

1996 S600 Euro
1991 560SEC  Euro ECE
1991 560SEC GT28 Conversion
1990 500SL Japan
1989 190E 2.6 factory 5sp
1989 560SEC ECE AMG Japan
1989 560SEC AMG Solid Lifter/6800rpm
1988 300TE
1987 300E AMG
1986 560SEL AMG 6.0L 32V
1986 AMG Hammer 6.0L 32V
2006 Z4 3.0Si M spec 6sp


On Mon, Apr 13, 2009 at 11:16 AM, Dick Spellman <dick.spellman at gmail.com>wrote:


>  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___><http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Oxygen-Sensor-Bosch_3486230-P_291_R%7CGRPEMISAMS_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><mfm at meyerprobateproperties.com>

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

> 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><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> <tnstheisen at msn.com>

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

> *To:* 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

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