Hi again, thank you for your reply..
No I cant see that with the air filter neither to be honest - unless it was totally the wrong one - and that can affect air flow and cause problems - maybe that was it..but its not the root cause otherwise it would be ok now..
As regards XXXXX XXXXX pipes, you have the different system to the one I was referring to then, that was my mistake I apologise..
In that case, the next suspect -and one that does cause such starting problems, assuming is not an immobilser fault as discussed above, is a sensor fault..
This is the ECT sensor - this Engine coolant temp sensor, sends relevant temperature info to the ems - engine management computer and if it sends erratic / false or no info .. the ecu the commands the fueling / air incorrectly -and will cause starting problems - I would suggest renewing that sensor regardless of diagnostics - because 9 times out of 10, it wont show up s faulty on these models. The sensor is cheap (around 20£ depending on exact one ( give Vauxhall parts dept the vehilces VIN to get the correct one )... and it takes 5 mins to change it..
Just check the connections are good too - as bad connections there will cause the same problems...
To help you further - click the link I have uploaded for you HERE
- which shows the location of the Ect sensor - item 6...
I suggest renew that now - Other than something more serious , such as trouble on the immobilser system or with the diesel pump, theres every chance thats whats causing your problems here now..
After that - IF you still have trouble - I suggest take it to a diesel specialist ..who will test the pump / injection system / fuel pressure etc etc...to trace the fault down.
I hope that helps you further -
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Best Rgds - - MIKE.