I've a 1997 nexia automatic with the 1598cc DOHC 16v engine. It died on me on the M25. I was rolling along at about 70mph when I heard what sounded like a ticking noise. After about 30 seconds of trying to work out if it was a rattle in the glove box we found out that it wasn't as all power was lost and we ended up on the hard shoulder.
I took a look under the lid and saw some smoke coming from the crank side of the engine - not a great deal but some. It was looking like a cam belt failure

Green Flag arranged for a chap with a tow truck to attend. Not good because they usually just want to tow you away - and charge you for it. I don't think he was a qualified mechanic and just confirmed my fears by pronouncing it a cam belt failure without doing any investigation.
The car is now sat outside my home where I have been able to have a look at the engine.
I can't get the cam belt cover off because there is not enough clearance to remove the pump pulley so I can only really see the top of the cam pulleys. The cam belt looks fine. It seems tight and shows no sign of missing teeth or other wear.
I am getting good sparks from all the plugs. The no. 3 cylinder plug looks oily but all the others look good. There seems to be a certain amount of oil around the lower part of the engine. There is fuel getting to the injectors and by taking the plugs out after turning the engine over I can detect that fuel is getting into the cylinders.
I can't see any problems under the cam cover. I can't see any sign of wear on the cams or broken springs.
The engine turns over but none of the cylinders fire.
Now, I am wondering if the head gasket has gone but I can't see why all the cylinders fail to fire.
The car is nine years old. It had the following service history:
Delivery date: 3/8/97
10000 miles/12 month service 10/98 6000 miles on the clock.
20000 miles/24 month service 10/99 11000 miles
no 30000 mile service logged in the book.
40000 miles/48 month service 11/01 22000 miles (major service)
At about this time daewoo went t*ts up. Since then the car has had basic oil/plugs/filters changes.
It has now done 58000 miles.
I am not a mechanic so it's all uninformed guesswork on my part. Can anybody help?
Thanks.