Car will start fine 49 out of 50 times but without obvious reason it sometimes struggles to start (as seen in video). This can be on a cold start or a warm start. Happens in warm, cold, wet and dry weather.

Video of car trouble

Bought the car a month ago - full service history - local mechanic gave it the once over (after we noticed this issue) and said that everything looks good.

It has had a new battery (installed after the original one failed a week after purchase) so I doubt this is the issue.

It has been plugged into two separate garage's computers for diagnostic with no errors recorded. Two garages could not find a fault (they didn't witness the starting problem - I have only just managed to capture it on video). Any ideas?

Current ideas (based on some online research)

• EGR value not forming a seal prob due to the fact soot is stopping a valve or something to operate correctly.
• Throttle body air valve getting stuck closed because of soot in the intake causing to harden when engine is powered off and not releasing when trying to start it.

Are both points the same? Could this be logical?

Car used to start fine 49 out of 50 times but without obvious reason it sometimes struggled to start (as seen in video). This can be on a cold start or a warm start. Happens in warm, cold, wet and dry weather.

EDIT: This morning, the car fails to start at all. Nothing I try will make it start. I took a video last night - this was an example of the starting trouble that I have experienced intermittently for the last few weeks. But this morning the same thing happened but it will not start.

Video of car trouble

Bought the car a month ago - full service history - local mechanic gave it the once over (after we noticed this issue) and said that everything looks good.

It has had a new battery (installed after the original one failed a week after purchase) so I doubt this is the issue.

It has been plugged into two separate garage's computers for diagnostic with no errors recorded. Two garages could not find a fault (they didn't witness the starting problem - I have only just managed to capture it on video). Any ideas?

Current ideas (based on some online research)

• EGR value not forming a seal prob due to the fact soot is stopping a valve or something to operate correctly.
• Throttle body air valve getting stuck closed because of soot in the intake causing to harden when engine is powered off and not releasing when trying to start it.

Are both points the same? Could this be logical?

Car will start fine 49 out of 50 times but without obvious reason it sometimes struggles to start (as seen in video). This can be on a cold start or a warm start. Happens in warm, cold, wet and dry weather.

Video of car trouble

Bought the car a month ago - full service history - local mechanic gave it the once over (after we noticed this issue) and said that everything looks good.

It has had a new battery (installed after the original one failed a week after purchase) so I doubt this is the issue.

It has been plugged into two separate garage's computers for diagnostic with no errors recorded. Two garages could not find a fault (they didn't witness the starting problem - I have only just managed to capture it on video). Any ideas?

Car will start fine 49 out of 50 times but without obvious reason it sometimes struggles to start (as seen in video). This can be on a cold start or a warm start. Happens in warm, cold, wet and dry weather.

Video of car trouble

Bought the car a month ago - full service history - local mechanic gave it the once over (after we noticed this issue) and said that everything looks good.

It has had a new battery (installed after the original one failed a week after purchase) so I doubt this is the issue.

It has been plugged into two separate garage's computers for diagnostic with no errors recorded. Two garages could not find a fault (they didn't witness the starting problem - I have only just managed to capture it on video). Any ideas?

Current ideas (based on some online research)

• EGR value not forming a seal prob due to the fact soot is stopping a valve or something to operate correctly.
• Throttle body air valve getting stuck closed because of soot in the intake causing to harden when engine is powered off and not releasing when trying to start it.

Are both points the same? Could this be logical?