With advance apologies for replying to a fairly old message, I have been prompted to look back at "endotex23"'s posts and so far have been imressed. I just wanted to drop a little info based on your last comment in this post endotex23 wrote: > I'm guessing >if you look more closely at that procedure you'll find it requires >the Lambda system to be disabled. This is usually done by >disconnecting the oxygen sensor on an OBD 1 or earlier vehicle so >equipped. > > FYI under warm-up conditions, lambda sensor disconnected, and, crucially, *when the full throttle microswitch is pressed* all have exactly the same effect, electrically speaking. This assumes your full throttle switch is working... However, I have to stick up for Bill here - all the B28F's I've ever put on an analyser with lambda system working work at around 1% CO. And I have the luxury of servicing a large number of D's without catalytic convertors. I too have access to a different set of manuals - specifically the Renault K-Jet manual which also tells the same story for the Swiss Emissions controlled version of the Renault 30. The mixture screw does nothing more than adjust the offset of the fuelling graph - ie the "C" in the Y=Mx+C and has little or no effect, proportinally speaking, higher in the rev range where the cat is working hardest. I'd also invite you to see what the CO does at idle when the full throttle switch is pressed. I think you'll be surprised to see the CO skyrocket to a level that would fail an emissions test in the UK, let alone California! Martin DMUK To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/