You may laugh but, for the past few days I still can't put a model no. to Dads' old Astra estate. There's so many in the Haynes manual, it's bewildering, and the more I sit and read the Haynes manual ...the more I go round and round in circles. In fact, I'm sure that Haynes manuals are specifically designed to make one do just that. e.g. "...go to Section 3 , then proceed as in Paragraphs * * and *, then try and spot the relevant section according to which particular engine that is in your car, ...engine no. is on the block in front of the clutch housing HA!!! do they mean "in front" as you stand in front of the car, ....or could it be on the right hand side of the block (as seen stood in front of the car)...which would be above the clutch housing ....mmm...haven't looked there yet. ...." and now go back to section 3B?? ....do this, refer to that, back to Chapter *, then according to what you've got, refer to Chapter */ Section ??** ....whatever. WHO is this idiot at Haynes that's been indexing these manuals like this for years ??? anyhooo...the clues are building up, .....any help would be muchly appreciated. It's Astra estate - 1996 1600 CDX 16v DOHC Ecotech engine :-) GM-Multec ECU ...now I suspect that it's a Multec S MPi rather than the CFi but, this is taking me round in circles as well. I've scrubbed off the front of the engine block with some WD40 and a nail brush and all I can see is a big GM with a long no. under it - which looks like an engine no. ....by the way NEVER buy a mail order cat. with a ceramic monolith in it, or if you do, BUY IT LOCALLY. I knew that they often don't survive couriers ......from ages old...but, ...tried to save a few quid, ....off the ramp and two hundred yards down the road RATTLE...RATTLE...CLINKETY,CLUNK ..Biiiig chunk of smashed monolith banging around in there, "S**T" shot through my mind, ...as well as several other expletives :-) I've got ECU codes 47 and 92 left in the ECU 47 means I've got to sort out the EGR valve, and 92 will hopefully go away when my new ebay camshaft sensor arrives and gets slapped in there ! :-) ....anyway, any clues on pinning down the damned engine model no would be hugely appreciated :-) regards, Richard