O2 sensor poss?

[robbie_742003]

Hi all, sometimes if I've been running the car about a bit it sometimes struggles to start and when I've done a really long run it wouldn't start for a while and stunk of fuel. I'm thinking 02 sensor possibly? Any other thoughts?
Thanks
Rob

[Mullen]

The car should run fine without the lambda connected so it's not that causing the starting issue.
I'd check your coil, igniter and the rest of the ignition system first.

[robbie_742003]

They're all pretty new really.
It always starts, if it's left for a few hours it starts as soon as the key is turned but if I've restarted after a few minutes, it feels like it's over fuelled and takes a few seconds to get going and in the summer with the tops off it reeks of petrol after a while.

[Mullen]

The igniter and coil earth through the cage that holds them on the rear firewall. Worth checking that's still making a good connection.
Some people run a second earth just to be sure.
Do you have error codes 21 or 25? Both are lambda related.

Also, check your exhaust system, the b-pipe in particular because I've had holes in mine before the O2 sensor and it does overfuel then. Taking the heatshields off can be a pain but the last two have cracked right on the two-into-one join.