[DavieGravy]

Originally posted by oab_au


Hey Dave don't be like that, I'm sure that if somebody knew what the cause of the problem was, they would say.

I have not had the problem so it is hard to troubleshoot it.
What Beav has put up seems to be valid and I would accept it as the probable cause.
The open loop time, is a problem, hence the electrically heated O2 sensors and quick heat catalytic converters now used on later cars to speed up the event.
Harvey.

I apologize.
Thanks.