Hi Martin, the CO content when measured by a gas analyser should always be done pre-cat (via a sample pipe) and the figures 1.0-1.3% are at the samplepipe. The Cat will reduce this to 0.0% ideal or 0.3% max (MOT limit to newcat equipped cars) so I agree with what you say. I'm sure I said in the earlier e-mail that if the cat is removed then the system then measure the CO content by % volume at the exhaust. My car has a cat and I set mine with the duty cycle of the freq valve set to 50% using the O2 sensor as the exhaust analyser! My MOT reading was 0.01%CO !! Happy motoring. Nick Martin Gutkowski <webmaster@xxxx> wrote: Hi Nick I have both the Renault PRV manual and the Renault K-Jetronic manual. The latter of which states that a lambda equipped system should be tuned to round 1.0%. Are we talking across purposes here? You are talking about sampling the gas upstream of the cat, aren't you? Without a cat, 0.3% at the exhuast pipe will be far far too lean, and should be set to 1.0% or 1.5% if you want to lose the lambda system and gain some power. I've set up a lot of DeLorean engines. Martin Nick Tomlinson wrote: > If you adjust the mixture so that when the lambda >sensor is plugged in it reads 0.3%, it'll be a tough car to start on a >cold morning, and you'll lose a lot of power. >Nick - Not true, you set the base system to 1.0-1.3% (as per my Bosch manual), the Lambda system will reduce this value and the cat will do the rest.I'm sure I have uploaded the Bosch K-Lambda system on this newsgroup. > > Yahoo! Groups SponsorADVERTISEMENT DOC UK Website: www.delorean.co.uk Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx ** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. --------------------------------- Want to chat instantly with your online friends??Get the FREE Yahoo!Messenger [Non-text portions of this message have been removed]