[W126 Coupe] O2 sensor absent 1992 W126 560SEC - CIS-E

[Sharan Bains]

Leave the car as is - UK cars did not need cats until late 92....so thank 
the lord your car does not have cats and lambda sensor rubbish.

I'm based in the UK too.

BTW, Dan's mixture instructions are mainly applicable for US spec cars with 
cats. Our UK cars have a slightly different set-up at x11.

If you are getting claimed MPG figs, then that's as good as it gets.

I used to get the claimed figs on my 560 too, but significantly less since 
installing AMG cams and higher ratio diff (2.82). Power output is IRO 
325-330bhp, with a free-flow dual exit exhaust system on my 560SEC. Stock 
output was 300bhp (mine's a 1988).

And you've confirmed what I suspected about your car being registered 92. So 
it was built in late 91, indeed one of the last w126 SEC's you have there.


talbir




>From: "Paul Miller" <paulmiller at ozemail.com.au>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] O2 sensor absent 1992 W126 560SEC - CIS-E
>Date: Sun, 5 Jun 2005 22:03:44 +0100
>
>
>Hello All
>
>Thanks for imput. It was your article on adjusting mixture Dan that started
>me reading up and looking further.
>
>My car is a UK car ( and I actually live and work in UK , temporarily
>despite Australian email address )  Cats were an option up until 1992 I
>think and most (? all ) UK 126's do not have them.  It looks like the 
>lambda
>sensor was only present on cars with cats ( according to a Haynes manual on
>W124's in UK )
>
>There appear to be three versions of the 560 according to a thread on
>benzworld.
>
>560 called ECE with 300 hp
>560 called RUF with 272 hp (pre-equipped catalyst)   ? Euro spec with cat
>560 called Kat with 242 hp (catalyst)   ? USA spec
>
>My car was built in Sindelfingen according to the chassis number tag of A
>and was for the UK.  It is one of the very last W126 first registered 1992.
>
>My owners manual gives two horsepower figures with  and without cat.
>
>560 SEC
>nominal power 220kW ( 300HP ) at 5000 rpm
>with catalyst 205kW ( 272HP ) at 5200  rpm
>
>
>The original reason I started looking was to see if I could improve my fuel
>economy although I am getting EXACTLY the fuel consumption the model
>brochure at the time claims.....12.7 litres / 100 km at 120 km/hr   ( I 
>used
>19.7 litres traveling 153 km at approx 120 - 130 km/hr on motorway. )
>
>Seems that a lambda sensor may help the efficiency by constantly regulating
>the mixture.
>
>I will try to get some more information from the dealer and other sources 
>to
>see if RUF version and ECE version ECU was the same.  Presumably if not, a
>RUF version ECU may be the solution and then plumb in a lambda sensor.
>
>Other option is to apply a  test voltage ( ie simulated lambda )into the
>connector for the lambda connector and measuring the duty cycle to see it
>alters and hence confirming the ECU is connected to the wiring for the
>lambda sensor. ( I am worried about destroying the ECU with the wrong
>voltage so any advice on how to do this would be appreciated )
>
>
>Regards
>
>
>Paul
>
>
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