[Giorgio2013]

hi i have a vauxhall corsa 1l ,twinport ,54 plate facelift model that i bought that had overheaded so i put new piston rings and it got its compretion back i then put a new timing chain and a new head gasket as well and the car will not start on the key but if i bump start it will start but it wont idle but if i hold the throttle it will stay running plus after 30 mins or so it will then idle and i turned the car of and tryed starting with the key and eventually it start after 20 seconds of turning over.
then i tryed starting with the key the next day it would not start on the key again.
i have also changed the crankshaft position sensor and didnt change.

now i dont know what else to do ??

 

[taurus]

It helps to post in the right place - the help section under mechanical questions will get the best answers.

Not really a lot of information as there could be a multitude of reasons for your problem - the most likely being something isn't connected up right. Recheck everything and make sure there's nothing left disconnected.

If nothing obvious then when it won't start check the basics - is there a spark, is fuel reaching the fuel rail, is fuel reaching the cylinders?