450 mile journey now a issue

[Benmk3]

Hello
Drove to Manchester and back from London over the weekend and I've come across a problem with the car but not sure what's causing it ?
The whole way there and back on the motor way the temp gauge was around 65-70 degrees and once I come off the motorway and stopped at some lights quite a lot of smoke was coming out the exhaust to the point I couldn't really see the cars behind , carried on driving stop / start through the city gauge went up to 90 and never smoked again. On the way back it done the same at 70 when stopped at idle

 

[pauldazzle]

You've got a stuck open stat for sure. Once engine is up to 90c it should stay there.

 

[Darran]

You've got 2 different issues going on there! Which engine have you got?

 

[Benmk3]

I've got a 1.8t

 

[Darran]

Blue thick oil smoke or white steam type smoke? Have you checked engine ccoolant and oil levels?

 

[Benmk3]

My coolant level hasn't really dropped but it's blue smoke

 

[Darran]

OK, first thing is check pcv valve under inlet manifold and all breather pipes, sounds like either PCV is knackered or a blocked breather pipe.What's oil level like, second thing is remove rubber hose to throttle body and tell me if its full of oil.