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[jonnycool]

If all the conventional wisdom and troubleshooting fails, my car failed to start last year for about 2 months because there was a poor earth somewhere (sorry to be so vague). The car was cranking and showing a spark, fuel delivery etc but wouldn't fire up.

Does sound as though you may have disturbed crank sensor though, they're temperamental things

[Malcolm_D]

Checked for strong spark as per advice, it is there so all points towards crank sensor, will remove it once I can get access to the passenger side - it is parked close to a wall at present! First job is to see a medic as I appear to have developed a broken wrist 

[Kneepad]

I've just re-read the whole thread and I don't see where anyone suggested that you should break your wrist.
This will of course make further attempts at repairing your fault more difficult.

[Boatboy]

If it is disturbed wiring of the crank sensor you could try re-disturbing it. I believe that's what got me home from Greece in August - a good jiggle of the wires both ends and off we went. Finally replaced the sensor in October when she failed to start again.

However, if as you say your crank sensor was replaced recently I would have thought it unlikely that the wiring would have degraded so soon. Could still be a duff generic part though.

[Andy B]

....
However, if as you say your crank sensor was replaced recently I would have thought it unlikely that the wiring would have degraded so soon.  .....

depends on where the wiring was routed ie away from the exhaust. 

[Boatboy]

Surely you're not suggesting that a garage would do it any other way

Reminds me, I ought to get out and cut off the old sensor and plug one of these days

[Malcolm_D]

I've just re-read the whole thread and I don't see where anyone suggested that you should break your wrist.
This will of course make further attempts at repairing your fault more difficult.

Panic over, well about the wrist anyway! Went to the docs who suggested a problem with tendons - no idea why though, the goods news is that it has now improved dramatically 

The bad news is that the 'outlaws' are staying for a few days and it is back to work on Tuesday so no time yet to check the condition of the sensor  It will have to wait until the weekend I suppose. 

[Malcolm_D]

Well, it isn't the crankshaft sensor! Got it off, it is a genuine GM part and the cable does not look cooked. Replaced it anyway, just to eliminate the possibility and it made no difference - back to the drawing board.

Next step is to check the strength of the spark more closely - how strong should it be and should it be a regular spark? Will try to check as many leads as possible.

After that I don't know!