Have a Renault Laguna 1.9 dci (03). Engine turns - does not fire. Had this problem few weeks ago. Replaced Glow plugs, Battery and put new battery in Key card. Still have SAME problem. Some days it will start normally - other days engine turns but will not fire -- and when this happens there is no signs that it will fire.
So it is an intermittent fault.
Diagnostics machine shows no faults.
What are the likely causes. Where should i take my car to get this problem resolved - bearing in mind it is an intermittent problem.