My understanding is, the real purpose of the O2 is to keep the air and fuel metered at the proper stoichiometric ratio that the cats require to operate. So I would guess if you don't have cats on your car, you probably don't have an O2. With computers, they can help to workout the driving needs, and adjust the fuel and air as required, but primarily always within or close to that magic figure 13;1 or14:1, something like that? It will go outside these parameters at times when needed, like starting up, or under really heavy load, where it will go rich as needed.
That's my understanding anyway, but I'm no engineer. Ed 300E On 4 February 2011 10:20, Alex Chamberlain <apchamberl...@gmail.com> wrote: > > Jim Cathey wrote: > >> > >> So I've been driving the 560 SEL lately and it seems to me that it has > >> one other odd behavior to go along with its variably-high and > >> sometimes rough idle: as it's warming up it is somewhat puny and rough > >> running, but as the engine temperature gauge approaches normal > >> operating temperature it's almost as if a switch is flipped and the > >> car surges forward a bit and smooths out. > > Mitch said: > > What if it is woefully 'out of tune', but switches from open loop to > closed > > loop mode at a certain temperature, checks the O2 sensor and adjusts > itself? > > > > My Euro 500SEL exhibits very similar behavior. Would it have an O2 > sensor, considering that (judging by the smell of the exhaust) it has > virtually no emissions controls? > > Alex > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
