Whirring Noise After Switching Off, And Smoke!

[Guest Ialsorideaharley]

Hi All, been a while

 

I have a 2008 '08' C8 with about 6000 miles on the clock, but I have a bit of a problem - when you switch off the engine, there is a whirring noise from under the car that goes on for some time, and then a burning smell and smoke coming from under the car. Any ideas? I thought the damn thing was going to burst into flames the first time it happened!

[techbod]

a warranty job mate but it could be the purge system getting rid of unburnt gasses

[Guest Ialsorideaharley]

a warranty job mate but it could be the purge system getting rid of unburnt gasses

 

Cheers for that - I asked around other places and it seems to be something to do with the emissions control - there is a small heater that kicks in when the ambient temp is lower to help warm the engine up quicker, so if the car has only been running for a short while in the cold weather, this heater kicks in and will keep going after the engine is switched off. Just seemed a bit worrying the first time it happened!

[techbod]

nice to know what it is and seen it on the VW diesel and always wondered what that was, I've never come across any problems with it though as long as it doesn't put any warning lights on :)

[Guest louella]

So glad this topic is on here. Have same problem, it all makes sense - phew! Thanks for posting your findings.

[jlsmith]

Yes, I also have this on my '57 C8. Sent it in a couple of times but garage claimed to know nothing about it. But they're only the experts! :blink:

[kfk]

I'm assuming this is occuring after the vehicle has been run for a short while/distance.....maybe a mile and then turned off.

 

 

If this is the case its probably the fuel heater operating during the cold start cycle......if the vehicle hasnt reached the temperature required for it to turn itself off the pump for the fuel heater will continue to run with ignition off and burn off the excess fuel in the system.

 

 

This is normal.

 

 

users likely to notice this......someone getting up early to ge the newspaper from the local shops a mile away......the occurance of the smoke appears as you turn off.