Hi folks, looking for ideas as to what can be causing a rough/hunting idle upon cold start. 

 

A few weeks ago I foolishly drove the car 5-6miles without the oil cap after I'd topped up. I noticed as the car was hunting idle massively whilst driving and could smell the oil burning off as it had sprayed out the cap hole.

 

Since then I have noticed a rough unsettled hunting idle on cold start. This morning it was so bad it died completely and the start/stop kicked in to correct it. It seems to last for 20-30seconds or until I give it a few revs.

 

Could I have damaged anything driving with the cap off for 15-20mins? Any sensors etc? It's a 2014 car with about 103k on the clock.

 

Thoughts appreciated.

I've had a similar issue on and off for a while with mine, same year, but 160k on the clock. 

It's possible you've got oil on the sensors for the cam angle on the intake and/or exhaust. One of them is right next to the oil cap. 

Take the plugs off, and see if there's oil inside making a bad connection. 

I've very inexpertly circled their location here! 

 

If you have access to vcds or obd11 etc, you can check what the sensors a reading