Since the Mk 2 cars were all pre OBD, they had only one O2 sensor which was mounted before the cat. So the ECU never knew if the cat even existed or was functioning properly. Now that I think about it, if the O2 sensor has no output, or was not connected, the ECU will go into "safe mode", which is full rich. Hence your poor fuel mileage. I also recalled that the O2 sensor on the Motronic cars is a three wire type, which means it has a heater, so its output will become valid more quickly in order to reduce emissions. All this is bringing back memories of all the 16V trivia I acquired over the years. 😐
~Holland On Feb 27, 2016 20:00, "damac2004" <damac2...@sbcglobal.net> wrote: > i could test compression but it it did drive fine before i tore it all > apart, after this incident. > > this car had no cat so 02 sensor was laying underneath airbox this whole > time :). > > i thought the car stunk and i got bad mileage but this car was fun to > drive. i was beating on itand it pulled when i stomped on it all the time > > -- > You received this message because you are subscribed to the Google Groups > "MK2-16v" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to mk2-16v+unsubscr...@googlegroups.com. > To post to this group, send email to mk2-16v@googlegroups.com. > Visit this group at https://groups.google.com/group/mk2-16v. > To view this discussion on the web visit > https://groups.google.com/d/msgid/mk2-16v/c9b6bb5d-ae7b-4c28-8f59-aa4b98cee00c%40googlegroups.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "MK2-16v" group. To unsubscribe from this group and stop receiving emails from it, send an email to mk2-16v+unsubscr...@googlegroups.com. To post to this group, send email to mk2-16v@googlegroups.com. Visit this group at https://groups.google.com/group/mk2-16v. To view this discussion on the web visit https://groups.google.com/d/msgid/mk2-16v/CABrbKBn2gaFsALPn2Df5EV27d%2BzM4%2BU-rYv-Ysw%3Dop0D94fJpg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
