This forum will help:- Mark,
http://www.vauxhallownersnetwork.co.uk/forumdisplay.php?f=83
You can only blanc off your EGR valve on the later 2001 mpi models. Can't do it with the earlier pre 2000 spi models. I know, as I own a 2000 Astra 1.6 8v.
Any ECU light? ECU diagnostic port under handbrake lever inside car. Diagnostic reader plugged in there.
George.
May 2009