Astra J 2.0cdti Wont start

[toffc]

Hi Just broken down my Astra J 2.0 Cdti stopped at lights then would not start. It turns over and seems to catch but then turns over more quickly but will not run. I checked to see if the starter still turns the engine when it goes more quicker and it does......anybody had similar not sure if its electrical or mechanical?

[Big Dave2]

Has the cambelt snapped?

[toffc]

Hi the story has progressed since my post. After approx 3 hours got in it and it started so ran it for about the same distance it did the time it broke down, stopped it and restarted all seems fine. The only issue is tickover is a little erratic so cleaned the MAF and it seems more stable....know this is not my issue, but going to run it and see what happens. Very strange the way it turned over slow then fast but its ok now maybe crank sensor? unless anybody has had this before.