Any idea what to check?

[pdfisherman]

I have a 2008 B7 A4. 150k miles. Check engine light on with a couple codes. -cooling system performance, evap leak. They may not be related, but both are on. Cars runs fine. It has trouble starting when hot. Starts fine cold, then if I shut it to get gas, or go somewhere, it cranks and cranks before finally turning over. Any idea where to look?

Thanks in advance.

[Okedokey]

VCDS

[djhemmen]

N80

[swaggerwagon]

Does it have a hard time starting after you fill up the tank?

[hemantpd1]

Cooling system performance could be caused by a bad thermostat or coolant temperature sensor. Does your coolant temperature gauge needle stays in the middle while cruising on a highway or it drops? Can you post the exact error code?

[Theiceman]

N80 and thermostat both cheap and fairly easy to change
N80 about a one and stat about a 3 on the difficulty scale for diy

[JesusB7a4]

×2 ^
Make sure to have triple squares for the thermostat

[JesusB7a4]

**×2 ^
Make sure to have triple squares for when you do the thermostat**

[pdfisherman]

Thanks for the advice everyone. I have determined that it is not hard starting when hot, it's after I get gas. I also noticed a couple of days ago I got a message saying close gas cap, even though it was closed.

As far as the temperature, in traffic it will hover around the middle of the guage, but when I pick up speed and cruise on the highway, it drops down to around a quarter (I forget the actual temperature but I can check). Does this sound like the thermostat?

[1killera4]

N80 and thermostat both cheap and fairly easy to change
N80 about a one and stat about a 3 on the difficulty scale for diy

^ This.

[KingWulfgar]

As far as the temperature, in traffic it will hover around the middle of the guage, but when I pick up speed and cruise on the highway, it drops down to around a quarter (I forget the actual temperature but I can check). Does this sound like the thermostat?

Yes. Definitely the thermostat. That temp gauge should fairly quickly run up to the middle and stay pegged there 100% of the time once the engine is warmed up. Might not be related to your other issues (EVAP leak and starting). As others have said the N80 EVAP purge valve is a good and cheap place to start for the EVAP issue.

[hemantpd1]

Thanks for the advice everyone. I have determined that it is not hard starting when hot, it's after I get gas. I also noticed a couple of days ago I got a message saying close gas cap, even though it was closed.

As far as the temperature, in traffic it will hover around the middle of the guage, but when I pick up speed and cruise on the highway, it drops down to around a quarter (I forget the actual temperature but I can check). Does this sound like the thermostat?

Thermostat for sure