I wonder if someone can help me with a strange starting problem concerning a bog-standard (none turbo) clockwork 1.7 GM Astra diesel.
When it's been standing overnight and I then try to start it, all the while I keep turning the engine over it won't fire, that is until I release the key, then it will usually fire immediately.
I could understand this happening on a petrol engine, where the ignition system is being starved due to the drain of the starter motor, but why should this happen on a diesel engine that uses absolutely no electronics whatsoever?