Hard start

First thing I would do is get the computer (OB2) scanned. This will make it easier to help in the diagnosis. Most auto part stores will do this for free. When you get the codes, write them down and let me know what they are. There are many problems that could create this symptom and without speculating for hours let's try this out first and I'll be happy to help you out in finding the problem.

Thanks, look forward to your reply

Sean

I have big problem! my corsa 1.7 dti iz hard to start but is sparking right n timing is ok and putting petrol orght still is hard to start please help ineed this car please help

It sounds like you may have a vacuum leak or an engine coolant temperature sensor that is out. I would test for the vacuum leak first and then go for the sensor here are three guides to help you find out whats going on.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

and

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Please let us know what happens.

Cheers, Ken